MWE SEC Filings - MarkWest Energy Partners, LP- Annual Report, Proxy Statement, Prospectus

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1166036

SEC Filings

All companies that sell securities in the United States must register with the Securities and Exchange Commission (SEC) and file reports on a regular basis. These reports include company annual reports (10K, 10Q), news updates (8K), investor presentations (found in 8Ks), insider trades (form 4), ownership reports (13D, and 13G), and reports related to the specific securities sold, such as registration statements and prospectus. This page shows recent SEC filings related to MarkWest Energy Partners, LP

SEC Filings (Chronological Order)

This page provides a complete, chronological list of SEC Filings, excluding ownership filings which we provide elsewhere.

February 3, 2016	SC 13G/A	MWE / MarkWest Energy Partners, LP / UBS Group AG - SC 13G/A Passive Investment SC 13G/A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Information to be included in Statements filed pursuant to Rules 13d-1(b), (c) and (d) and amendments thereto filed pursuant to Rule 13d-2(b) (Amendment No. 1) Markwest Energy Partners LP (Name of Issuer) Common units representing limited partner interests (Title of Class of Securities) 570759100 (CUSIP N
December 31, 2015	15-12B	MarkWest Energy Partners FORM 15-12B Form 15-12B UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 15 CERTIFICATION AND NOTICE OF TERMINATION OF REGISTRATION UNDER SECTION 12(g) OF THE SECURITIES EXCHANGE ACT OF 1934 OR SUSPENSION OF DUTY TO FILE REPORTS UNDER SECTIONS 13 AND 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934. MARKWEST ENERGY PARTNERS, L.P. (Exact name of registrant as specified in its charter) D
December 10, 2015	EX-99.1	MPLX and MarkWest announce successful completion of combination and director and executive appointments Exhibit 99.1 MPLX and MarkWest announce successful completion of combination and director and executive appointments FINDLAY, Ohio, Dec. 4, 2015 ? MPLX LP (NYSE: MPLX) and MarkWest Energy Partners, L.P. today announced the completion of the previously announced merger by which MarkWest became a wholly owned subsidiary of MPLX. As of this morning, MarkWest ceased to be a publicly traded partnership
December 10, 2015	8-K	Changes in Control of Registrant, Termination of a Material Definitive Agreement, Material Modification to Rights of Security Holders, Notice of Delisting or Failure to Satisfy a Continued Listing Rule or Standard; Transfer of Listing, Financial Statements and Exhibits, Completion of Acquisition or Disposition of Assets, Other Events UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): December 4, 2015 MARKWEST ENERGY PARTNERS, L.P. (Exact name of registrant as specified in its charter) Delaware 001-31239 27-0005456 (State or other jurisdiction of incorporation or o
December 9, 2015	SC 13D/A	MWE / MarkWest Energy Partners, LP / TORTOISE CAPITAL ADVISORS, L.L.C. - MARKWEST 13D/A 12.04.15 Activist Investment UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 1)* Markwest Energy Partners, L.P. (Name of Issuer) Common Units Representing Limited Partner Interests (Title of Class of Securities) 570759100 (CUSIP Number) Diane Bono, Chief Compliance Officer 11550 Ash Street Suite 300 Leawood, KS 66211 Telephone (913)
December 8, 2015	S-8 POS	MarkWest Energy Partners S-8 POS As filed with the Securities and Exchange Commission on December 8, 2015 Registration No.
December 8, 2015	POS AM	MarkWest Energy Partners POS AM As filed with the Securities and Exchange Commission on December 8, 2015 Registration No.
December 8, 2015	S-8 POS	MarkWest Energy Partners S-8 POS As filed with the Securities and Exchange Commission on December 8, 2015 Registration No.
December 8, 2015	S-8 POS	MarkWest Energy Partners S-8 POS As filed with the Securities and Exchange Commission on December 8, 2015 Registration No.
December 8, 2015	S-8 POS	MarkWest Energy Partners S-8 POS As filed with the Securities and Exchange Commission on December 8, 2015 Registration No.
December 8, 2015	POS AM	MarkWest Energy Partners POS AM POS AM 1 a15-246701posam.htm POS AM As filed with the Securities and Exchange Commission on December 8, 2015 Registration No. 333- 194013 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Post-Effective Amendment No. 1 to Form S-3 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 MARKWEST ENERGY PARTNERS, L.P. (Exact name of Registrant as specified in its charter) Delaw
December 8, 2015	POS AM	MarkWest Energy Partners POS AM As filed with the Securities and Exchange Commission on December 8, 2015 Registration No.
December 8, 2015	S-8 POS	MarkWest Energy Partners S-8 POS As filed with the Securities and Exchange Commission on December 8, 2015 Registration No.
December 8, 2015	POS AM	MarkWest Energy Partners POS AM As filed with the Securities and Exchange Commission on December 8, 2015 Registration No.
December 4, 2015	EX-4.4	MARKWEST ENERGY PARTNERS, L.P. MARKWEST ENERGY FINANCE CORPORATION THE SUBSIDIARY GUARANTORS NAMED HEREIN, WELLS FARGO BANK, NATIONAL ASSOCIATION, as Trustee NINETEENTH SUPPLEMENTAL INDENTURE Dated as of December 3, 2015 Dated as of November 2, 2010 Exhibit 4.4 MARKWEST ENERGY PARTNERS, L.P. AND MARKWEST ENERGY FINANCE CORPORATION AND THE SUBSIDIARY GUARANTORS NAMED HEREIN, AND WELLS FARGO BANK, NATIONAL ASSOCIATION, as Trustee NINETEENTH SUPPLEMENTAL INDENTURE Dated as of December 3, 2015 to Indenture Dated as of November 2, 2010 4.875% Senior Notes due 2025 THIS NINETEENTH SUPPLEMENTAL INDENTURE (this ?Supplemental Indenture?), dated as of
December 4, 2015	8-K	Regulation FD Disclosure 8-K 1 a15-2453118k.htm 8-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): December 3, 2015 MARKWEST ENERGY PARTNERS, L.P. (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporatio
December 4, 2015	EX-99.1	MPLX LP and MarkWest Energy Partners, L.P. Announce Successful Early Note Exchange Tender Period Exhibit 99.1 MPLX LP and MarkWest Energy Partners, L.P. Announce Successful Early Note Exchange Tender Period FINDLAY, Ohio, and DENVER, Dec. 4, 2015 ? MPLX LP (NYSE: MPLX) and MarkWest Energy Partners, L.P. (NYSE: MWE) (MarkWest) today announced that, in connection with the previously announced offers to exchange (the ?Exchange Offers?) any and all of the $4.1 billion in aggregate principal amoun
December 4, 2015	EX-4.3	MARKWEST ENERGY PARTNERS, L.P. MARKWEST ENERGY FINANCE CORPORATION THE SUBSIDIARY GUARANTORS NAMED HEREIN, WELLS FARGO BANK, NATIONAL ASSOCIATION, as Trustee EIGHTEENTH SUPPLEMENTAL INDENTURE Dated as of December 3, 2015 Dated as of November 2, 2010 Exhibit 4.3 MARKWEST ENERGY PARTNERS, L.P. AND MARKWEST ENERGY FINANCE CORPORATION AND THE SUBSIDIARY GUARANTORS NAMED HEREIN, AND WELLS FARGO BANK, NATIONAL ASSOCIATION, as Trustee EIGHTEENTH SUPPLEMENTAL INDENTURE Dated as of December 3, 2015 to Indenture Dated as of November 2, 2010 4.875% Senior Notes due 2024 THIS EIGHTEENTH SUPPLEMENTAL INDENTURE (this ?Supplemental Indenture?), dated as of
December 4, 2015	EX-4.2	MARKWEST ENERGY PARTNERS, L.P. MARKWEST ENERGY FINANCE CORPORATION THE SUBSIDIARY GUARANTORS NAMED HEREIN, WELLS FARGO BANK, NATIONAL ASSOCIATION, as Trustee SEVENTEENTH SUPPLEMENTAL INDENTURE Dated as of December 3, 2015 Dated as of November 2, 2010 Exhibit 4.2 MARKWEST ENERGY PARTNERS, L.P. AND MARKWEST ENERGY FINANCE CORPORATION AND THE SUBSIDIARY GUARANTORS NAMED HEREIN, AND WELLS FARGO BANK, NATIONAL ASSOCIATION, as Trustee SEVENTEENTH SUPPLEMENTAL INDENTURE Dated as of December 3, 2015 to Indenture Dated as of November 2, 2010 4.5 % Senior Notes due 2023 THIS SEVENTEENTH SUPPLEMENTAL INDENTURE (this ?Supplemental Indenture?), dated as of
December 4, 2015	EX-4.1	MARKWEST ENERGY PARTNERS, L.P. MARKWEST ENERGY FINANCE CORPORATION THE SUBSIDIARY GUARANTORS NAMED HEREIN, WELLS FARGO BANK, NATIONAL ASSOCIATION, as Trustee SIXTEENTH SUPPLEMENTAL INDENTURE Dated as of December 3, 2015 Dated as of November 2, 2010 5 Exhibit 4.1 MARKWEST ENERGY PARTNERS, L.P. AND MARKWEST ENERGY FINANCE CORPORATION AND THE SUBSIDIARY GUARANTORS NAMED HEREIN, AND WELLS FARGO BANK, NATIONAL ASSOCIATION, as Trustee SIXTEENTH SUPPLEMENTAL INDENTURE Dated as of December 3, 2015 to Indenture Dated as of November 2, 2010 5.5% Senior Notes due 2023 THIS SIXTEENTH SUPPLEMENTAL INDENTURE (this ?Supplemental Indenture?), dated as of Dece
December 3, 2015	425	MPLX 425 (Prospectus) MPLX 425 Dec 3 2015 Combined Document Filed by MPLX LP Commission File No.: 001-35714 Pursuant to Rule 425 under the Securities Act of 1933, as amended Subject Company: MarkWest Energy Partners, L.P. Commission File No.: 001-31239 The attached slides were first made available by MPLX on its website and at the Marathon Petroleum Corporation and MPLX LP 2015 Analyst & Investor Day in New York, New Y
December 3, 2015	425	MPLX 425 (Prospectus) 425 Filed by MPLX LP Commission File No.: 001-35714 Pursuant to Rule 425 under the Securities Act of 1933, as amended Subject Company: MarkWest Energy Partners, L.P. Commission File No.: 001-31239 The following press release was issued by MPLX LP on December 3, 2015. Marathon Petroleum Corp. and MPLX LP announce 2016 capital investment plan FINDLAY, Ohio, Dec. 3, 2015 - At an analyst and investor
December 3, 2015	425	MPLX 425 (Prospectus) Filed by MPLX LP Commission File No.: 001-35714 Pursuant to Rule 425 under the Securities Act of 1933, as amended Subject Company: MarkWest Energy Partners, L.P. Commission File No.: 001-31239 The following comments were made at the Marathon Petroleum Corporation and MPLX LP 2015 Analyst & Investor Day in New York, New York on December 3, 2015 and made available for replay on MPLX LP’s website. Th
December 2, 2015	EX-99.1	MarkWest unitholders approve combination with MPLX Transaction expected to close Dec. 4, 2015 Exhibit 99.1 MarkWest unitholders approve combination with MPLX Transaction expected to close Dec. 4, 2015 FINDLAY, Ohio, and DENVER, Dec. 1, 2015 ? At a special meeting held today, unitholders of MarkWest Energy Partners, L.P. (NYSE: MWE) approved a strategic combination with MPLX LP (NYSE: MPLX) by voting to approve the merger agreement dated July 11, 2015, as amended. Based on the voting result
December 2, 2015	8-K	Financial Statements and Exhibits, Other Events, Submission of Matters to a Vote of Security Holders UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): December 1, 2015 MARKWEST ENERGY PARTNERS, L.P. (Exact name of registrant as specified in its charter) Delaware 001-31239 27-0005456 (State or other jurisdiction of incorporation or o
December 1, 2015	425	MPLX 425 (Prospectus) Filed by MPLX LP Commission File No.: 001-35714 Pursuant to Rule 425 under the Securities Act of 1933, as amended Subject Company: MarkWest Energy Partners, L.P. Commission File No.: 001-31239 The following press release was issued by MPLX LP on December 1, 2015. MarkWest unitholders approve combination with MPLX Transaction expected to close Dec. 4, 2015 FINDLAY, Ohio, and DENVER, Dec. 1, 2015 —
November 24, 2015	425	MarkWest Energy Partners 425 (Prospectus) Filed by MarkWest Energy Partners, L.P. Pursuant to Rule 425 under the Securities Act of 1933, as amended Subject Company: MarkWest Energy Partners, L.P. Commission File No.: 001-31239 The following letter was mailed to certain MarkWest unitholders on November 23, 2015. 105 Madison Avenue, New York, NY, 10016 Tel: 212-929-5500 Fax: 212-929-0308 Email: [email protected] New York London Lo
November 23, 2015	425	MPLX 425 (Prospectus) 425 Filed by MPLX LP Commission File No.: 001-35714 Pursuant to Rule 425 under the Securities Act of 1933, as amended Subject Company: MarkWest Energy Partners, L.P. Commission File No.: 001-31239 The following press release was issued by MPLX LP on November 23, 2015. Marathon Petroleum Corp. and MPLX LP Analyst and Institutional Investor Meeting to be Webcast Live on Dec. 3 FINDLAY, Ohio, Nov. 23
November 20, 2015	425	MarkWest Energy Partners 425 (Prospectus) Filed by MarkWest Energy Partners, L.P. Pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14a-12 under the Exchange Act of 1934 Subject Company: MarkWest Energy Partners, L.P. Commission File No.: 001-31239 The following letter was mailed to MarkWest unitholders on November 20, 2015. THE SPECIAL MEETING IS JUST DAYS AWAY - VOTE ?FOR? ON THE ENCLOSED PROXY CARD
November 20, 2015	425	MarkWest Energy Partners 425 (Prospectus) Filed by MarkWest Energy Partners, L.P. Pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14a-12 under the Exchange Act of 1934 Subject Company: MarkWest Energy Partners, L.P. Commission File No.: 001-31239 The following press release was issued by MarkWest Energy Partners, L.P. on November 20, 2015. MarkWest Energy Partners, L.P. Contact: Frank Semple, Chairm
November 19, 2015	425	MPLX 425 (Prospectus) 425 Filed by MPLX LP Commission File No.: 001-35714 Pursuant to Rule 425 under the Securities Act of 1933, as amended Subject Company: MarkWest Energy Partners, L.P. Commission File No.: 001-31239 The following press release was issued by MPLX LP on November 19, 2015. MPLX LP Commences Exchange Offers and MarkWest Energy Partners, L.P. Commences Consent Solicitations FINDLAY, Ohio, and DENVER, Nov
November 19, 2015	425	MarkWest Energy Partners 425 (Prospectus) Filed by MarkWest Energy Partners, L.P. Pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14a-12 under the Exchange Act of 1934 Subject Company: MarkWest Energy Partners, L.P. Commission File No.: 001-31239 The following press release was issued by MarkWest Energy Partners, L.P. on November 19, 2015. MPLX LP Commences Exchange Offers and MarkWest Energy Partne
November 18, 2015	425	MarkWest Energy Partners 425 (Prospectus) Filed by MarkWest Energy Partners, L.P. Pursuant to Rule 425 under the Securities Act of 1933, as amended Subject Company: MarkWest Energy Partners, L.P. Commission File No.: 001-31239 The following press release was issued by MarkWest Energy Partners, L.P. on November 18, 2015. MarkWest Energy Partners, L.P. Contact: Frank Semple, Chairman, President & CEO 1515 Arapahoe Street Nancy Buese, Execut
November 18, 2015	SC 13D	MWE / MarkWest Energy Partners, LP / MPLX LP - SC 13D Activist Investment UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. )* MarkWest Energy Partners, L.P. (Name of Issuer) Common Units Representing Limited Partner Interests (Title of Class of Securities) 570759100 (CUSIP Number) J. Michael Wilder Vice President, General Counsel and Secretary 200 E. Hardin Street Findlay, Ohio
November 18, 2015	EX-99.7	Joint Filing Agreement Exhibit 99.7 Joint Filing Agreement In accordance with Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended, the persons named below agree to the joint filing of a statement on Schedule 13D (including amendments thereto) with respect to the common units, representing limited partner interests, of MarkWest Energy Partners, L.P., a limited partnership organized and existing under the
November 18, 2015	SC 13D	MWE / MarkWest Energy Partners, LP / KAYNE ANDERSON CAPITAL ADVISORS LP - KAYNE ANDERSON CAPITAL ADVISORS, L.P. SC 13D 11-16-2015 (MARKWEST ENERGY PARTNERS, L.P.) Activist Investment UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. )* Markwest Energy Partners, L.P. (Name of Issuer) Common Units Representing Limited Partner Interests (Title of Class of Securities) 570759100 (CUSIP Number) David Shladovsky, General Counsel 1800 Avenue of the Stars, 3rd Floor Los Angeles, CA 90067 Telepho
November 17, 2015	425	MPLX 425 (Prospectus) MPLX Form 425 Nov 17 2015 Combined Document Filed by MPLX LP Commission File No.: 001-35714 Pursuant to Rule 425 under the Securities Act of 1933, as amended Subject Company: MarkWest Energy Partners, L.P. Commission File No.: 001-31239 MPLX LP posted a link to the presentation below on its website. MPLX and MarkWest Strategic Combination Transaction Structure and Terms As Revised November 17, 201
November 17, 2015	EX-99.1	MPLX/MarkWest Combination Receives Further Cash Consideration from Marathon Petroleum Corp. Exhibit MPLX/MarkWest Combination Receives Further Cash Consideration from Marathon Petroleum Corp.
November 17, 2015	EX-99.3	VOTING AGREEMENT Exhibit 99.3 VOTING AGREEMENT This VOTING AGREEMENT (this ?Agreement?), dated as of November 16, 2015, is entered into by and among MPLX LP, a Delaware limited partnership (?Parent?), MPLX GP LLC, a Delaware limited liability company and the general partner of Parent (?Parent GP?), and Sapphire Holdco LLC, a Delaware limited liability company and a wholly owned subsidiary of Parent (?Merger Sub? a
November 17, 2015	DEFA14A	MarkWest Energy Partners DEFA14A Use these links to rapidly review the document TABLE OF CONTENTS Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.
November 17, 2015	8-K	Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Other Events UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 16, 2015 MARKWEST ENERGY PARTNERS, L.P. (Exact name of registrant as specified in its charter) Delaware 001-31239 27-0005456 (State or other jurisdiction of incorporation or
November 17, 2015	EX-10.1	VOTING AGREEMENT Exhibit VOTING AGREEMENT This VOTING AGREEMENT (this ? Agreement ?), dated as of November 16, 2015, is entered into by and among MPLX LP, a Delaware limited partnership (? Parent ?), MPLX GP LLC, a Delaware limited liability company and the general partner of Parent (? Parent GP ?), and Sapphire Holdco LLC, a Delaware limited liability company and a wholly owned subsidiary of Parent (? Merger Sub ? and, with Parent and Parent GP, the ? Parent Entities ?), and each of the Persons set forth on Schedule A hereto (each, a ? Unitholder ?), as investment adviser, manager or general partner on behalf of various record and beneficial owners.
November 17, 2015	EX-2.1	AMENDMENT NUMBER 2 TO AGREEMENT AND PLAN OF MERGER Exhibit AMENDMENT NUMBER 2 TO AGREEMENT AND PLAN OF MERGER THIS AMENDMENT NUMBER 2 TO AGREEMENT AND PLAN OF MERGER, dated as of November 16, 2015 (this ? Amendment ?), is made by and among MarkWest Energy Partners, L.
November 17, 2015	425	MarkWest Energy Partners 8-K (Prospectus) UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 16, 2015 MARKWEST ENERGY PARTNERS, L.P. (Exact name of registrant as specified in its charter) Delaware 001-31239 27-0005456 (State or other jurisdiction of incorporation or
November 17, 2015	EX-2.1	AMENDMENT NUMBER 2 TO AGREEMENT AND PLAN OF MERGER Exhibit 2.1 EXECUTION VERSION AMENDMENT NUMBER 2 TO AGREEMENT AND PLAN OF MERGER THIS AMENDMENT NUMBER 2 TO AGREEMENT AND PLAN OF MERGER, dated as of November 16, 2015 (this ?Amendment?), is made by and among MarkWest Energy Partners, L.P., a Delaware limited partnership (the ?Partnership?), MPLX LP, a Delaware limited partnership (?Parent?), MPLX GP LLC, a Delaware limited liability company and t
November 17, 2015	SC 13D	MWE / MarkWest Energy Partners, LP / TORTOISE CAPITAL ADVISORS, L.L.C. - MWE 13D 11.16.15 Activist Investment UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. )* MarkWest Energy Partners, L.P. (Name of Issuer) Common Units Representing Limited Partner Interests (Title of Class of Securities) 570759100 (CUSIP Number) Diane Bono, Chief Compliance Officer 11550 Ash Street Suite 300 Leawood, KS 66211 Telephone (913) 9
November 17, 2015	EX-99.1	MPLX/MarkWest Combination Receives Further Cash Consideration from Marathon Petroleum Corp. Exhibit 99.1 MPLX/MarkWest Combination Receives Further Cash Consideration from Marathon Petroleum Corp. ? Marathon Petroleum Corporation increases one-time cash payment to $6.20 per unit on a best and final basis ? Total cash consideration of approximately $1.28 billion provides substantially enhanced value to MarkWest unitholders ? Three of MarkWest?s top unitholders, representing more than 15 p
November 17, 2015	EX-99.2	VOTING AGREEMENT Exhibit 99.2 VOTING AGREEMENT This VOTING AGREEMENT (this ?Agreement?), dated as of November 16, 2015, is entered into by and among MPLX LP, a Delaware limited partnership (?Parent?), MPLX GP LLC, a Delaware limited liability company and the general partner of Parent (?Parent GP?), and Sapphire Holdco LLC, a Delaware limited liability company and a wholly owned subsidiary of Parent (?Merger Sub? a
November 17, 2015	EX-99.2	VOTING AGREEMENT Exhibit 99.2 VOTING AGREEMENT This VOTING AGREEMENT (this ?Agreement?), dated as of November 16, 2015, is entered into by and among MPLX LP, a Delaware limited partnership (?Parent?), MPLX GP LLC, a Delaware limited liability company and the general partner of Parent (?Parent GP?), and Sapphire Holdco LLC, a Delaware limited liability company and a wholly owned subsidiary of Parent (?Merger Sub? a
November 17, 2015	425	MPLX 425 (Prospectus) 425 Filed by MPLX LP Commission File No.: 001-35714 Pursuant to Rule 425 under the Securities Act of 1933, as amended Subject Company: MarkWest Energy Partners, L.P. Commission File No.: 001-31239 MPLX Management made the following remarks to Marathon Petroleum Corporation employees at an employee meeting on November 16, 2015, which was first posted for replay on November 17, 2015: Chairman and Ch
November 17, 2015	425	MarkWest Energy Partners 425 (Prospectus) Filed by MarkWest Energy Partners, L.P. Pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14a-12 under the Exchange Act of 1934 Subject Company: MarkWest Energy Partners, L.P. Commission File No.: 001-31239 As part of the Proxy Supplement materials being mailed, the following letter was mailed to MarkWest unitholders commencing on November 17, 2015. PLEASE VOT
November 17, 2015	EX-2.1	AMENDMENT NUMBER 2 TO AGREEMENT AND PLAN OF MERGER Exhibit 2.1 EXECUTION VERSION AMENDMENT NUMBER 2 TO AGREEMENT AND PLAN OF MERGER THIS AMENDMENT NUMBER 2 TO AGREEMENT AND PLAN OF MERGER, dated as of November 16, 2015 (this ?Amendment?), is made by and among MarkWest Energy Partners, L.P., a Delaware limited partnership (the ?Partnership?), MPLX LP, a Delaware limited partnership (?Parent?), MPLX GP LLC, a Delaware limited liability company and t
November 17, 2015	EX-10.2	VOTING AGREEMENT Exhibit VOTING AGREEMENT This VOTING AGREEMENT (this ? Agreement ?), dated as of November 16, 2015, is entered into by and among MPLX LP, a Delaware limited partnership (? Parent ?), MPLX GP LLC, a Delaware limited liability company and the general partner of Parent (? Parent GP ?), and Sapphire Holdco LLC, a Delaware limited liability company and a wholly owned subsidiary of Parent (? Merger Sub ? and, with Parent and Parent GP, the ? Parent Entities ?), and each of the Persons set forth on Schedule A hereto (each, a ? Unitholder ?), as investment adviser, manager or general partner on behalf of various record and beneficial owners.
November 17, 2015	425	MarkWest Energy Partners 425 (Prospectus) Filed by MarkWest Energy Partners, L.P. Pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14a-12 under the Exchange Act of 1934 Subject Company: MarkWest Energy Partners, L.P. Commission File No.: 001-31239 MarkWest Energy Partners, L.P. posted a link to the presentation below on its website. MPLX and MarkWest Strategic Combination Transaction Structure and Te
November 17, 2015	425	MPLX 8-K (Prospectus) 8-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K Current Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported) November 16, 2015 MPLX LP (Exact name of registrant as specified in its charter) Delaware 001-35714 45-5010536 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification Number) 200 E.
November 17, 2015	EX-99.3	VOTING AGREEMENT Exhibit 99.3 VOTING AGREEMENT This VOTING AGREEMENT (this ?Agreement?), dated as of November 16, 2015, is entered into by and among MPLX LP, a Delaware limited partnership (?Parent?), MPLX GP LLC, a Delaware limited liability company and the general partner of Parent (?Parent GP?), and Sapphire Holdco LLC, a Delaware limited liability company and a wholly owned subsidiary of Parent (?Merger Sub? a
November 17, 2015	EX-99.1	MPLX/MarkWest Combination Receives Further Cash Consideration from Marathon Petroleum Corp. Exhibit 99.1 MPLX/MarkWest Combination Receives Further Cash Consideration from Marathon Petroleum Corp. ? Marathon Petroleum Corporation increases one-time cash payment to $6.20 per unit on a best and final basis ? Total cash consideration of approximately $1.28 billion provides substantially enhanced value to MarkWest unitholders ? Three of MarkWest?s top unitholders, representing more than 15 p
November 13, 2015	425	MPLX 425 (Prospectus) MPLX Form 425 Nov 13, 2015 Combined Document Filed by MPLX LP Commission File No.: 001-35714 Pursuant to Rule 425 under the Securities Act of 1933, as amended Subject Company: MarkWest Energy Partners, L.P. Commission File No.: 001-31239 MPLX LP posted a link to the presentation below on its website. This presentation contains forward-looking statements within the meaning of federal securities law
November 13, 2015	8-K	Current Report UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): November 12, 2015 MARKWEST ENERGY PARTNERS, L.P. (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation or organization) 001-312
November 12, 2015	EX-99.1	Marathon Petroleum Corp. increases cash consideration for MPLX/MarkWest merger EX-99.1 Exhibit 99.1 Marathon Petroleum Corp. increases cash consideration for MPLX/MarkWest merger ? One-time cash payment from MPC raised to $1.075 billion from $675 million ? Total cash consideration of ~$5.21 per unit substantially enhances value to MarkWest unitholders ? MarkWest board and executive management affirm their support for the transaction and its revised terms ? Supplemental proxy
November 12, 2015	425	MPLX 425 (Prospectus) MPLX Form 425 Nov 12, 2015 Combined Document Filed by MPLX LP Commission File No.: 001-35714 Pursuant to Rule 425 under the Securities Act of 1933, as amended Subject Company: MarkWest Energy Partners, L.P. Commission File No.: 001-31239 MPLX updated the following investor slides. MPLX and MarkWest Strategic Combination Transaction Structure and Terms As Revised November 12, 2015 Forward?Looking S
November 12, 2015	EX-99.1	Investor presentation November 12, 2015 Exhibit 99.1 Investor presentation November 12, 2015 Non-Gaap financial measures / Forward-Looking Statements 2 MarkWest Energy Partners, L.P. is a master limited partnership that owns and operates midstream services related businesses. MarkWest has a leading presence in many natural gas resource plays including the Marcellus Shale, Utica Shale, Huron/Berea Shale, Haynesville Shale, Woodford Shale
November 12, 2015	EX-2.1	AMENDMENT TO AGREEMENT AND PLAN OF MERGER EX-2.1 Exhibit 2.1 EXECUTION VERSION AMENDMENT TO AGREEMENT AND PLAN OF MERGER THIS AMENDMENT TO AGREEMENT AND PLAN OF MERGER, dated as of November 10, 2015 (this ?Amendment?), is made by and among MarkWest Energy Partners, L.P., a Delaware limited partnership (the ?Partnership?), MPLX LP, a Delaware limited partnership (?Parent?), MPLX GP LLC, a Delaware limited liability company and the general
November 12, 2015	8-K	Regulation FD Disclosure, Financial Statements and Exhibits, Other Events UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): November 12, 2015 MARKWEST ENERGY PARTNERS, L.P. (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation or organization) 001-312
November 12, 2015	EX-99.1	Investor presentation November 12, 2015 Exhibit 99.1 Investor presentation November 12, 2015 Non-Gaap financial measures / Forward-Looking Statements 2 MarkWest Energy Partners, L.P. is a master limited partnership that owns and operates midstream services related businesses. MarkWest has a leading presence in many natural gas resource plays including the Marcellus Shale, Utica Shale, Huron/Berea Shale, Haynesville Shale, Woodford Shale
November 12, 2015	425	MarkWest Energy Partners 425 (Prospectus) Filed by MarkWest Energy Partners, L.P. Pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14a-12 under the Exchange Act of 1934 Subject Company: MarkWest Energy Partners, L.P. Commission File No.: 001-31239 MPLX and MarkWest Strategic Combination Transaction Structure and Terms As Revised November 12, 2015 Forward Looking Statements This presentation contains
November 12, 2015	425	MarkWest Energy Partners 8-K (Prospectus) UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): November 12, 2015 MARKWEST ENERGY PARTNERS, L.P. (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation or organization) 001-312
November 12, 2015	425	MPLX FORM 8-K (Prospectus) Form 8-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K Current Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported) November 10, 2015 MPLX LP (Exact name of registrant as specified in its charter) Delaware 001-35714 45-5010536 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification Number) 200 E.
November 10, 2015	8-K	MarkWest Energy Partners 8-K (Current Report/Significant Event) UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 10, 2015 MARKWEST ENERGY PARTNERS, L.P. (Exact name of registrant as specified in its charter) Delaware 001-31239 27-0005456 (State or other jurisdiction of incorporation or
November 10, 2015	EX-2.1	AMENDMENT TO AGREEMENT AND PLAN OF MERGER Exhibit 2.1 EXECUTION VERSION AMENDMENT TO AGREEMENT AND PLAN OF MERGER THIS AMENDMENT TO AGREEMENT AND PLAN OF MERGER, dated as of November 10, 2015 (this ?Amendment?), is made by and among MarkWest Energy Partners, L.P., a Delaware limited partnership (the ?Partnership?), MPLX LP, a Delaware limited partnership (?Parent?), MPLX GP LLC, a Delaware limited liability company and the general partner
November 10, 2015	EX-99.1	Marathon Petroleum Corp. increases cash consideration for MPLX/MarkWest merger Exhibit 99.1 Marathon Petroleum Corp. increases cash consideration for MPLX/MarkWest merger ? One-time cash payment from MPC raised to $1.075 billion from $675 million ? Total cash consideration of ~$5.21 per unit substantially enhances value to MarkWest unitholders ? MarkWest board and executive management affirm their support for the transaction and its revised terms ? Supplemental proxy cards b
November 10, 2015	EX-99.1	Marathon Petroleum Corp. increases cash consideration for MPLX/MarkWest merger Exhibit 99.1 Marathon Petroleum Corp. increases cash consideration for MPLX/MarkWest merger ? One-time cash payment from MPC raised to $1.075 billion from $675 million ? Total cash consideration of ~$5.21 per unit substantially enhances value to MarkWest unitholders ? MarkWest board and executive management affirm their support for the transaction and its revised terms ? Supplemental proxy cards b
November 10, 2015	EX-2.1	AMENDMENT TO AGREEMENT AND PLAN OF MERGER EX-2.1 2 a15-223963ex2d1.htm EX-2.1 Exhibit 2.1 EXECUTION VERSION AMENDMENT TO AGREEMENT AND PLAN OF MERGER THIS AMENDMENT TO AGREEMENT AND PLAN OF MERGER, dated as of November 10, 2015 (this “Amendment”), is made by and among MarkWest Energy Partners, L.P., a Delaware limited partnership (the “Partnership”), MPLX LP, a Delaware limited partnership (“Parent”), MPLX GP LLC, a Delaware limited liabi
November 10, 2015	425	MarkWest Energy Partners 8-K (Prospectus) UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 10, 2015 MARKWEST ENERGY PARTNERS, L.P. (Exact name of registrant as specified in its charter) Delaware 001-31239 27-0005456 (State or other jurisdiction of incorporation or
November 5, 2015	425	MarkWest Energy Partners 425 (Prospectus) Filed by MarkWest Energy Partners, L.P. Pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14a-12 under the Exchange Act of 1934 Subject Company: MarkWest Energy Partners, L.P. Commission File No.: 001-31239 MarkWest Energy Partners, L.P. Earnings Call Cautionary Statement Regarding Forward-Looking Statements This communication includes ?forward-looking stateme
November 4, 2015	EX-99.1	MarkWest Energy Partners Reports Third Quarter 2015 Financial Results Exhibit 99.1 MarkWest Energy Partners, L.P. Contact: Frank Semple, Chairman, President & CEO 1515 Arapahoe Street Nancy Buese, Executive VP and CFO Tower 1, Suite 1600 Josh Hallenbeck, VP of Finance & Treasurer Denver, Colorado 80202 Phone: (866) 858-0482 E-mail: [email protected] MarkWest Energy Partners Reports Third Quarter 2015 Financial Results ? Reported DCF of $176.0 million an
November 4, 2015	8-K	Regulation FD Disclosure, Other Events UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): November 4, 2015 MARKWEST ENERGY PARTNERS, L.P. (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation or organization) 001-3123
November 4, 2015	10-Q	MarkWest Energy Partners 10-Q (Quarterly Report) Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q x QUARTERLY REPORT PURSUANT TO SECTION 13 or 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2015 OR o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 001-31239
November 4, 2015	425	MarkWest Energy Partners 425 (Prospectus) Filed by MarkWest Energy Partners, L.P. Pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14a-12 under the Exchange Act of 1934 Subject Company: MarkWest Energy Partners, L.P. Commission File No.: 001-31239 The following presentation was made available by MarkWest Energy Partners, L.P. on its website on November 4, 2015. Third Quarter 2015 Conference Call Pres
November 4, 2015	EX-12.1	MarkWest Energy Partners, L.P. Calculation of Ratio of Earnings to Fixed Charges (Dollar amounts in thousands) Exhibit 12.1 MarkWest Energy Partners, L.P. Calculation of Ratio of Earnings to Fixed Charges (Dollar amounts in thousands) 2010 2011 2012 2013 2014 2015 (through September 30, 2015) Total fixed charges $ 120,697 $ 123,879 $ 157,323 $ 200,852 $ 206,759 $ 182,424 Earnings: Earnings (loss) from continuing operations before income taxes $ 31,757 $ 118,449 $ 255,293 $ 53,114 $ 202,522 $ (45,013 ) Add:
November 4, 2015	EX-99.1	MarkWest Energy Partners Reports Third Quarter 2015 Financial Results EX-99.1 2 a15-222881ex99d1.htm EX-99.1 Exhibit 99.1 MarkWest Energy Partners, L.P. Contact: Frank Semple, Chairman, President & CEO 1515 Arapahoe Street Nancy Buese, Executive VP and CFO Tower 1, Suite 1600 Josh Hallenbeck, VP of Finance & Treasurer Denver, Colorado 80202 Phone: (866) 858-0482 E-mail: [email protected] MarkWest Energy Partners Reports Third Quarter 2015 Financial Resu
November 4, 2015	425	MarkWest Energy Partners 8-K (Prospectus) UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): November 4, 2015 MARKWEST ENERGY PARTNERS, L.P. (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation or organization) 001-3123
November 2, 2015	425	MarkWest Energy Partners 425 (Prospectus) Filed by MarkWest Energy Partners, L.P. Pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14a-12 under the Exchange Act of 1934 Subject Company: MarkWest Energy Partners, L.P. Commission File No.: 001-31239 The following email was sent to MarkWest employees on November 2, 2015 by Frank Semple, Chairman, President and Chief Executive Officer. Subject: Status of
November 2, 2015	425	MPLX 8-K (Prospectus) 8-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K Current Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported) October 27, 2015 MPLX LP (Exact name of registrant as specified in its charter) Delaware 001-35714 45-5010536 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification Number) 200 E.
November 2, 2015	EX-10.1	EX-10.1 Exhibit EXECUTION VERSION AMENDMENT AGREEMENT This AMENDMENT AGREEMENT (this ? Agreement ?) is made and entered into as of October 27, 2015, by and among MPLX LP, a Delaware limited partnership (the ? Borrower ?), Citibank, N.
October 30, 2015	8-K	Financial Statements and Exhibits, Other Events UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 30, 2015 MARKWEST ENERGY PARTNERS, L.P. (Exact name of registrant as specified in its charter) Delaware 001-31239 27-0005456 (State or other jurisdiction of incorporation or o
October 30, 2015	EX-99.1	MarkWest Energy Partners Announces Filing of Definitive Proxy Statement Special Meeting of Unitholders to be Held on December 1, 2015 Exhibit 99.1 MarkWest Energy Partners, L.P. Contact: Frank Semple, Chairman, President & CEO 1515 Arapahoe Street Nancy Buese, Executive VP & CFO Tower 1, Suite 1600 Josh Hallenbeck, VP of Finance & Treasurer Denver, CO 80202 Phone: (866) 858-0482 E-mail: [email protected] MarkWest Energy Partners Announces Filing of Definitive Proxy Statement Special Meeting of Unitholders to be Held
October 30, 2015	EX-99.1	MarkWest Energy Partners Announces Filing of Definitive Proxy Statement Special Meeting of Unitholders to be Held on December 1, 2015 Exhibit 99.1 MarkWest Energy Partners, L.P. Contact: Frank Semple, Chairman, President & CEO 1515 Arapahoe Street Nancy Buese, Executive VP & CFO Tower 1, Suite 1600 Josh Hallenbeck, VP of Finance & Treasurer Denver, CO 80202 Phone: (866) 858-0482 E-mail: [email protected] MarkWest Energy Partners Announces Filing of Definitive Proxy Statement Special Meeting of Unitholders to be Held
October 30, 2015	DEFM14A	MarkWest Energy Partners DEFM14A DEFM14A Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.
October 30, 2015	425	MarkWest Energy Partners 8-K (Prospectus) UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 30, 2015 MARKWEST ENERGY PARTNERS, L.P. (Exact name of registrant as specified in its charter) Delaware 001-31239 27-0005456 (State or other jurisdiction of incorporation or o
October 29, 2015	425	MPLX 425 (Prospectus) 425 Filed by MPLX LP Commission File No.: 001-35714 Pursuant to Rule 425 under the Securities Act of 1933, as amended Subject Company: MarkWest Energy Partners, L.P. Commission File No.: 001-31239 An audio replay of the conference call reflected in the following transcript was made available by MPLX LP on its website on October 29, 2015. This communication contains forward-looking statements withi
October 29, 2015	425	MPLX 425 (Prospectus) 425 Filed by MPLX LP Commission File No.: 001-35714 Pursuant to Rule 425 under the Securities Act of 1933, as amended Subject Company: MarkWest Energy Partners, L.P. Commission File No.: 001-31239 The following press release was issued by MPLX LP on October 29, 2015. MPLX LP Reports Third -Quarter 2015 Financial Results ? Reported adjusted EBITDA of $64.6 million ; distributable cash flow of $52.5
September 9, 2015	425	MPLX 425 (Prospectus) MPLX September 425 Combined Document Filed by MPLX LP Commission File No.: 001-35714 Pursuant to Rule 425 under the Securities Act of 1933, as amended Subject Company: MarkWest Energy Partners, L.P. Commission File No.: 001-31239 The following slides were made available by MPLX LP on its website on September 9, 2015. Investor Presentation September 2015 Forward?Looking Statements This presentation
September 9, 2015	425	MPLX 425 (Prospectus) 425 1 mplxform425transcriptsept9.htm 425 Filed by MPLX LP Commission File No.: 001-35714 Pursuant to Rule 425 under the Securities Act of 1933, as amended Subject Company: MarkWest Energy Partners, L.P. Commission File No.: 001-31239 This presentation contains forward-looking statements within the meaning of federal securities laws regarding MPLX LP (“MPLX”), Marathon Petroleum Corporation (“MPC”)
September 4, 2015	425	MPLX 425 (Prospectus) 425 Filed by MPLX LP Commission File No.: 001-35714 Pursuant to Rule 425 under the Securities Act of 1933, as amended Subject Company: MarkWest Energy Partners, L.P. Commission File No.: 001-31239 MPLX Management made the following remarks to Marathon Petroleum Corporation employees at an employee meeting available for replay: Chairman and Chief Executive Officer Gary Heminger: Thank you, Don. Now
August 25, 2015	EX-99.1	MPLX LP and MarkWest Energy Partners, L.P. Announce Early Termination of HSR Act Waiting Period Exhibit 99.1 MPLX LP and MarkWest Energy Partners, L.P. Announce Early Termination of HSR Act Waiting Period FINDLAY, Ohio, and DENVER, Aug. 25, 2015 - MPLX LP (NYSE: MPLX) and MarkWest Energy Partners, L.P. (NYSE: MWE) today announced that they have received notification of early termination of the waiting period under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended, in conne
August 25, 2015	425	MPLX 425 (Prospectus) 425 Filed by MPLX LP Commission File No.: 001-35714 Pursuant to Rule 425 under the Securities Act of 1933, as amended Subject Company: MarkWest Energy Partners, L.P. Commission File No.: 001-31239 The following press release was issued by MPLX LP on August 25, 2015. MPLX LP and MarkWest Energy Partners, L.P. Announce Early Termination of HSR Act Waiting Period FINDLAY, Ohio, and DENVER, Aug. 25, 2
August 25, 2015	EX-99.1	MPLX LP and MarkWest Energy Partners, L.P. Announce Early Termination of HSR Act Waiting Period Exhibit 99.1 MPLX LP and MarkWest Energy Partners, L.P. Announce Early Termination of HSR Act Waiting Period FINDLAY, Ohio, and DENVER, Aug. 25, 2015 - MPLX LP (NYSE: MPLX) and MarkWest Energy Partners, L.P. (NYSE: MWE) today announced that they have received notification of early termination of the waiting period under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended, in conne
August 25, 2015	425	MarkWest Energy Partners 8-K (Prospectus) UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): August 25, 2015 MARKWEST ENERGY PARTNERS, L.P. (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation or organization) 001-31239
August 25, 2015	8-K	Current Report UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): August 25, 2015 MARKWEST ENERGY PARTNERS, L.P. (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation or organization) 001-31239
August 19, 2015	8-K	Regulation FD Disclosure UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): August 19, 2015 MARKWEST ENERGY PARTNERS, L.P. (Exact name of registrant as specified in its charter) Delaware 001-31239 27-0005456 (State or other jurisdiction of incorporation or or
August 19, 2015	425	MPLX 425 (Prospectus) Filed by MPLX LP Commission File No.: 001-35714 Pursuant to Rule 425 under the Securities Act of 1933, as amended Subject Company: MarkWest Energy Partners, L.P. Commission File No.: 001-31239 The following presentation was first used by MPLX LP on August 19, 2015. Investor Presentation August 2015 Forward‐Looking Statements This presentation contains forward-looking statements within the meaning
August 18, 2015	425	MarkWest Energy Partners 425 (Prospectus) Filed by MarkWest Energy Partners, L.P. Pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14a-12 under the Exchange Act of 1934 Subject Company: MarkWest Energy Partners, L.P. Commission File No.: 001-31239 The following information was made available to MarkWest Energy Partners, L.P.?s employees on August 18, 2015. Employee Questions about the MPLX LP and Mar
August 13, 2015	425	MarkWest Energy Partners 425 (Prospectus) Filed by MarkWest Energy Partners, L.P. Pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14a-12 under the Exchange Act of 1934 Subject Company: MarkWest Energy Partners, L.P. Commission File No.: 001-31239 The following press release was issued by MarkWest Energy Partners, L.P. on August 12, 2015. MarkWest Energy Partners, L.P. Contact: Frank Semple, Chairman
August 6, 2015	425	MarkWest Energy Partners 425 (Prospectus) 425 1 a15-170422425.htm 425 Filed by MarkWest Energy Partners, L.P. Pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14a-12 under the Exchange Act of 1934 Subject Company: MarkWest Energy Partners, L.P. Commission File No.: 001-31239 MarkWest Energy Partners, L.P. Earnings Call Cautionary Statement Regarding Forward-Looking Statements This communication inclu
August 5, 2015	EX-99.1	MarkWest Energy Partners Reports Second Quarter 2015 Financial Results Exhibit 99.1 MarkWest Energy Partners, L.P. Contact: Frank Semple, Chairman, President & CEO 1515 Arapahoe Street Nancy Buese, Executive VP and CFO Tower 1, Suite 1600 Josh Hallenbeck, VP of Finance & Treasurer Denver, Colorado 80202 Phone: (866) 858-0482 E-mail: [email protected] MarkWest Energy Partners Reports Second Quarter 2015 Financial Results ? Reported DCF of $165.9 million a
August 5, 2015	425	MarkWest Energy Partners 8-K (Prospectus) UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): August 5, 2015 MARKWEST ENERGY PARTNERS, L.P. (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation or organization) 001-31239
August 5, 2015	EX-99.1	MarkWest Energy Partners Reports Second Quarter 2015 Financial Results Exhibit 99.1 MarkWest Energy Partners, L.P. Contact: Frank Semple, Chairman, President & CEO 1515 Arapahoe Street Nancy Buese, Executive VP and CFO Tower 1, Suite 1600 Josh Hallenbeck, VP of Finance & Treasurer Denver, Colorado 80202 Phone: (866) 858-0482 E-mail: [email protected] MarkWest Energy Partners Reports Second Quarter 2015 Financial Results ? Reported DCF of $165.9 million a
August 5, 2015	8-K	MarkWest Energy Partners 8-K (Current Report/Significant Event) UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): August 5, 2015 MARKWEST ENERGY PARTNERS, L.P. (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation or organization) 001-31239
August 5, 2015	425	MarkWest Energy Partners 425 (Prospectus) Filed by MarkWest Energy Partners, L.P. Pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14a-12 under the Exchange Act of 1934 Subject Company: MarkWest Energy Partners, L.P. Commission File No.: 001-31239 The following presentation was made available by MarkWest Energy Partners, L.P. on its website on August 5, 2015. SECOND QUARTER 2015 CONFERENCE CALL PRESE
July 30, 2015	425	MPLX 425 (Prospectus) MPLX Form 425 Earnings Release July 30, 2015 Filed by MPLX LP Commission File No.: 001-35714 Pursuant to Rule 425 under the Securities Act of 1933, as amended Subject Company: MarkWest Energy Partners, L.P. Commission File No.: 001-31239 The following press release was issued by MPLX LP on July 30, 2015. MPLX LP Reports Second -Quarter 2015 Financial Results ? Reported adjusted EBITDA of $70.7 mil
July 30, 2015	425	MPLX 425 (Prospectus) MPLX Form 425 - Slide Deck July 30, 2015 Combined Document Filed by MPLX LP Commission File No.
July 30, 2015	425	MPLX 425 (Prospectus) Form 425 MPLX Transcript July 30, 2015 Filed by MPLX LP Commission File No.: 001-35714 Pursuant to Rule 425 under the Securities Act of 1933, as amended Subject Company: MarkWest Energy Partners, L.P. Commission File No.: 001-31239 An audio replay of the conference call reflected in the following transcript was made available by MPLX LP on its website on July 30, 2015. This communication contains
July 21, 2015	425	MarkWest Energy Partners 425 (Prospectus) Filed by MarkWest Energy Partners, L.P. Pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14a-12 under the Exchange Act of 1934 Subject Company: MarkWest Energy Partners, L.P. Commission File No.: 001-31239 The following press release was issued by MarkWest Energy Partners, L.P. on July 20, 2015. DENVER?(BUSINESS WIRE)?Jul. 20, 2015? MarkWest Energy Partners,
July 20, 2015	8-K	MarkWest Energy Partners 8-K (Current Report/Significant Event) UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 20, 2015 MARKWEST ENERGY PARTNERS, L.P. (Exact name of registrant as specified in its charter) Delaware 001-31239 27-0005456 (State or other jurisdiction of incorporation or orga
July 20, 2015	425	MarkWest Energy Partners 8-K (Prospectus) UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 20, 2015 MARKWEST ENERGY PARTNERS, L.P. (Exact name of registrant as specified in its charter) Delaware 001-31239 27-0005456 (State or other jurisdiction of incorporation or orga
July 20, 2015	EX-99.1	### Exhibit 99.1 MPLX & MarkWest provide supplemental information regarding the strategic combination announced July 13 FINDLAY, Ohio, and DENVER, July 20, 2015 ? Last week MPLX LP (NYSE: MPLX) and MarkWest Energy Partners, L.P. (NYSE:MWE) (MarkWest) announced they had signed a definitive merger agreement whereby MarkWest would become a wholly owned subsidiary of MPLX. In connection with the announcem
July 20, 2015	EX-99.1	### Exhibit 99.1 MPLX & MarkWest provide supplemental information regarding the strategic combination announced July 13 FINDLAY, Ohio, and DENVER, July 20, 2015 ? Last week MPLX LP (NYSE: MPLX) and MarkWest Energy Partners, L.P. (NYSE:MWE) (MarkWest) announced they had signed a definitive merger agreement whereby MarkWest would become a wholly owned subsidiary of MPLX. In connection with the announcem
July 20, 2015	EX-99.2	MPLX and MarkWest Strategic Combination As Revised July 20, 2015 Exhibit 99.2 MPLX and MarkWest Strategic Combination As Revised July 20, 2015 Forward?Looking Statements This presentation contains forward-looking statements within the meaning of federal securities laws regarding MPLX LP (?MPLX?), Marathon Petroleum Corporation (?MPC?), and MarkWest Energy Partners, L.P. (?MWE?). These forward-looking statements relate to, among other things, expectations, estim
July 20, 2015	EX-99.2	MPLX and MarkWest EX-99.2 MPLX and MarkWest Strategic Combination As Revised July 20, 2015 Exhibit 99.2 2 This presentation contains forward-looking statements within the meaning of federal securities laws regarding MPLX LP (?MPLX?), Marathon Petroleum Corporation (?MPC?), and MarkWest Energy Partners, L.P. (?MWE?). These forward-looking statements relate to, among other things, expectations, estimates and projecti
July 20, 2015	425	MPLX FORM 8-K (Prospectus) Form 8-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 20, 2015 MPLX LP (Exact name of registrant as specified in its charter) Delaware 001-35714 45-5010536 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employer Identification Number) 200 E.
July 20, 2015	EX-99.1	### EX-99.1 Exhibit 99.1 MPLX & MarkWest provide supplemental information regarding the strategic combination announced July 13 FINDLAY, Ohio, and DENVER, July 20, 2015 ? Last week MPLX LP (NYSE: MPLX) and MarkWest Energy Partners, L.P. (NYSE:MWE) (MarkWest) announced they had signed a definitive merger agreement whereby MarkWest would become a wholly owned subsidiary of MPLX. In connection with the a
July 20, 2015	EX-99.2	MPLX and MarkWest Strategic Combination As Revised July 20, 2015 Exhibit 99.2 MPLX and MarkWest Strategic Combination As Revised July 20, 2015 Forward?Looking Statements This presentation contains forward-looking statements within the meaning of federal securities laws regarding MPLX LP (?MPLX?), Marathon Petroleum Corporation (?MPC?), and MarkWest Energy Partners, L.P. (?MWE?). These forward-looking statements relate to, among other things, expectations, estim
July 17, 2015	425	MarkWest Energy Partners 425 (Prospectus) Filed by MarkWest Energy Partners, L.P. Pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14a-12 under the Exchange Act of 1934 Subject Company: MarkWest Energy Partners, L.P. Commission File No.: 001-31239 The following information was made available to MarkWest Energy Partners, L.P.?s employees on July 17, 2015. 1. Who is Marathon Petroleum (MPC)? a. Fortune
July 13, 2015	EX-99.1	MPLX LP and MarkWest Energy Partners, L.P. Announce Strategic Combination, Creating Fourth-Largest MLP Exhibit 99.1 MPLX LP and MarkWest Energy Partners, L.P. Announce Strategic Combination, Creating Fourth-Largest MLP ? Combination creates diversified MLP with $21 billion in market capitalization ? MPLX affirms its anticipated distribution growth of 29 percent this year and expects a 25 percent compound annual distribution growth rate for the combined entity through 2017 with a peer-leading growth
July 13, 2015	EX-99.2	VOTING AGREEMENT Exhibit 99.2 EXECUTION VERSION VOTING AGREEMENT This VOTING AGREEMENT (this ?Agreement?), dated as of July 11, 2015, is entered into by and among MPLX LP, a Delaware limited partnership (?Parent?), MPLX GP LLC, a Delaware limited liability company and the general partner of Parent (?Parent GP?), and Sapphire Holdco LLC, a Delaware limited liability company and a wholly owned subsidiary of Parent (
July 13, 2015	425	MPLX 425 (Prospectus) 425 Filed by MPLX LP Commission File No.: 001-35714 Pursuant to Rule 425 under the Securities Act of 1933, as amended Subject Company: MarkWest Energy Partners, L.P. Commission File No.: 001-31239 The following are talking points used by MPLX LP Chairman and Chief Executive Officer in speaking with MarkWest Energy Partners, L.P. employees. This communication contains forward-looking statements wit
July 13, 2015	425	MarkWest Energy Partners 425 (Prospectus) Filed by MarkWest Energy Partners, L.P. Pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14a-12 under the Exchange Act of 1934 Subject Company: MarkWest Energy Partners, L.P. Commission File No.: 001-31239 MPLX LP and MarkWest Energy Partners, L.P. Merger Call Cautionary Statement Regarding Forward-Looking Statements This communication includes ?forward-looki
July 13, 2015	425	MPLX 425 (Prospectus) 425 Filed by MPLX LP Commission File No.: 001-35714 Pursuant to Rule 425 under the Securities Act of 1933, as amended Subject Company: MarkWest Energy Partners, L.P. Commission File No.: 001-31239 The following is a transcript of a video recorded by MPLX LP Chairman and Chief Executive Officer for Marathon Petroleum Corporation employees. Note that the time of the conference call mentioned in the
July 13, 2015	EX-2.1	AGREEMENT AND PLAN OF MERGER Dated as of July 11, 2015 MPLX LP, MPLX GP LLC, Marathon Petroleum Corporation, Sapphire Holdco LLC, MarkWest Energy Partners, L.P. Exhibit 2.1 EXECUTION VERSION AGREEMENT AND PLAN OF MERGER Dated as of July 11, 2015 among MPLX LP, MPLX GP LLC, Marathon Petroleum Corporation, Sapphire Holdco LLC, and MarkWest Energy Partners, L.P. TABLE OF CONTENTS Page ARTICLE I THE MERGER Section 1.1 The Merger 2 Section 1.2 Closing 2 Section 1.3 Effective Time 2 Section 1.4 Effects of the Merger 2 Section 1.5 Organizational Documents of the
July 13, 2015	EX-99.3	MPLX and MarkWest Strategic Combination July 13, 2015 Exhibit 99.3 MPLX and MarkWest Strategic Combination July 13, 2015 Forward-Looking Statements This press release contains forward-looking statements within the meaning of federal securities laws regarding MPLX LP (?MPLX?), Marathon Petroleum Corporation (?MPC?), and MarkWest Energy Partners, L.P. (?MWE?). These forward-looking statements relate to, among other things, expectations, estimates and p
July 13, 2015	425	MPLX 425 (Prospectus) Filed by MPLX LP Commission File No.: 001-35714 Pursuant to Rule 425 under the Securities Act of 1933, as amended Subject Company: MarkWest Energy Partners, L.P. Commission File No.: 001-31239 The following email will be sent to Marathon Petroleum Corporation employees. Subject: Important Announcement from the President and CEO Body text: President and CEO Gary R. Heminger has an important announc
July 13, 2015	425	MPLX 425 (Prospectus) 425 Filed by MPLX LP Commission File No.: 001-35714 Pursuant to Rule 425 under the Securities Act of 1933, as amended Subject Company: MarkWest Energy Partners, L.P. Commission File No.: 001-31239 The following information will be posted on an internal Marathon Petroleum Corporation website for employees. Important announcement from the President and CEO President and CEO Gary R. Heminger has an i
July 13, 2015	8-K	MarkWest Energy Partners 8-K (Current Report/Significant Event) UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 11, 2015 MARKWEST ENERGY PARTNERS, L.P. (Exact name of registrant as specified in its charter) Delaware 001-31239 27-0005456 (State or other jurisdiction of incorporation or orga
July 13, 2015	EX-99.2	VOTING AGREEMENT Exhibit 99.2 EXECUTION VERSION VOTING AGREEMENT This VOTING AGREEMENT (this ?Agreement?), dated as of July 11, 2015, is entered into by and among MPLX LP, a Delaware limited partnership (?Parent?), MPLX GP LLC, a Delaware limited liability company and the general partner of Parent (?Parent GP?), and Sapphire Holdco LLC, a Delaware limited liability company and a wholly owned subsidiary of Parent (
July 13, 2015	EX-2.1	AGREEMENT AND PLAN OF MERGER Dated as of July 11, 2015 MPLX LP, MPLX GP LLC, Marathon Petroleum Corporation, Sapphire Holdco LLC, MarkWest Energy Partners, L.P. Exhibit 2.1 EXECUTION VERSION AGREEMENT AND PLAN OF MERGER Dated as of July 11, 2015 among MPLX LP, MPLX GP LLC, Marathon Petroleum Corporation, Sapphire Holdco LLC, and MarkWest Energy Partners, L.P. TABLE OF CONTENTS Page ARTICLE I THE MERGER Section 1.1 The Merger 2 Section 1.2 Closing 2 Section 1.3 Effective Time 2 Section 1.4 Effects of the Merger 2 Section 1.5 Organizational Documents of the
July 13, 2015	425	MPLX 425 (Prospectus) 425 Filed by MPLX LP Commission File No.: 001-35714 Pursuant to Rule 425 under the Securities Act of 1933, as amended Subject Company: MarkWest Energy Partners, L.P. Commission File No.: 001-31239 An audio replay of the conference call reflected in the following transcript was made available by MPLX LP on its website on July 13, 2015. This communication contains forward-looking statements within t
July 13, 2015	425	MarkWest Energy Partners 8-K (Prospectus) UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 11, 2015 MARKWEST ENERGY PARTNERS, L.P. (Exact name of registrant as specified in its charter) Delaware 001-31239 27-0005456 (State or other jurisdiction of incorporation or orga
July 13, 2015	EX-99.1	MPLX LP and MarkWest Energy Partners, L.P. Announce Strategic Combination, Creating Fourth-Largest MLP Exhibit 99.1 MPLX LP and MarkWest Energy Partners, L.P. Announce Strategic Combination, Creating Fourth-Largest MLP ? Combination creates diversified MLP with $21 billion in market capitalization ? MPLX affirms its anticipated distribution growth of 29 percent this year and expects a 25 percent compound annual distribution growth rate for the combined entity through 2017 with a peer-leading growth
July 13, 2015	425	MarkWest Energy Partners 425 (Prospectus) 425 1 a15-155642425.htm 425 Filed by MarkWest Energy Partners, L.P. Pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14a-12 under the Exchange Act of 1934 Subject Company: MarkWest Energy Partners, L.P. Commission File No.: 001-31239 The following letter was first sent to MarkWest Energy Partners, L.P.’s employees on July 13, 2015. Today is a very exciting an
July 13, 2015	EX-99.3	MPLX and MarkWest Strategic Combination July 13, 2015 Exhibit 99.3 MPLX and MarkWest Strategic Combination July 13, 2015 Forward-Looking Statements This press release contains forward-looking statements within the meaning of federal securities laws regarding MPLX LP (?MPLX?), Marathon Petroleum Corporation (?MPC?), and MarkWest Energy Partners, L.P. (?MWE?). These forward-looking statements relate to, among other things, expectations, estimates and p
June 8, 2015	8-K	MarkWest Energy Partners 8-K (Current Report/Significant Event) UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): June 8, 2015 (June 3, 2015) MARKWEST ENERGY PARTNERS, L.P. (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation or organizatio
June 3, 2015	8-K	Regulation FD Disclosure UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): June 3, 2015 MARKWEST ENERGY PARTNERS, L.P. (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation or organization) 001-31239 (C
June 2, 2015	EX-1.1	$1,200,000,000 MARKWEST ENERGY PARTNERS, L.P. MARKWEST ENERGY FINANCE CORPORATION 4.875% Senior Notes due 2025 Underwriting Agreement Exhibit 1.1 Execution Version $1,200,000,000 MARKWEST ENERGY PARTNERS, L.P. MARKWEST ENERGY FINANCE CORPORATION 4.875% Senior Notes due 2025 Underwriting Agreement May 28, 2015 Wells Fargo Securities, LLC 301 S. College Street Charlotte, North Carolina 28288 As Representative of the several Underwriters listed on Schedule III hereto Ladies and Gentlemen: MarkWest Energy Partners, L.P., a Delaware
June 2, 2015	8-K	Regulation FD Disclosure UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): May 28, 2015 MARKWEST ENERGY PARTNERS, L.P. (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation or organization) 001-31239 (C
June 2, 2015	EX-4.1	MARKWEST ENERGY PARTNERS, L.P., MARKWEST ENERGY FINANCE CORPORATION, as Issuers, THE SUBSIDIARIES NAMED HEREIN, as Subsidiary Guarantors WELLS FARGO BANK, NATIONAL ASSOCIATION, as Trustee 4.875% Senior Notes due 2025 FIFTEENTH SUPPLEMENTAL INDENTURE Exhibit 4.1 MARKWEST ENERGY PARTNERS, L.P., MARKWEST ENERGY FINANCE CORPORATION, as Issuers, THE SUBSIDIARIES NAMED HEREIN, as Subsidiary Guarantors and WELLS FARGO BANK, NATIONAL ASSOCIATION, as Trustee 4.875% Senior Notes due 2025 FIFTEENTH SUPPLEMENTAL INDENTURE Dated as of June 2, 2015 CROSS-REFERENCE TABLE* Trust Indenture Act Section Supplemental Indenture Section(s) 310 (a)(1) 8.10 (a)(2) 8
May 29, 2015	424B5	CALCULATION OF REGISTRATION FEE Use these links to rapidly review the document TABLE OF CONTENTS Table of Contents CALCULATION OF REGISTRATION FEE Class of securities registered Maximum Aggregate Offering Price Amount of Registration Fee 4.
May 28, 2015	8-K	Regulation FD Disclosure 8-K 1 a15-1291318k.htm 8-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): May 28, 2015 MARKWEST ENERGY PARTNERS, L.P. (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation or
May 28, 2015	EX-99.1	MarkWest Energy Partners Announces Tender Offers for Its 6.75% Senior Notes due 2020, 6.5% Senior Notes due 2021 and 6.25% Senior Notes due 2022 Exhibit 99.1 MarkWest Energy Partners, L.P. Contact: Frank Semple, Chairman, President & CEO 1515 Arapahoe Street Nancy Buese, Executive VP & CFO Tower 1, Suite 1600 Josh Hallenbeck, VP of Finance & Treasurer Denver, CO 80202 Phone: (866) 858-0482 E-mail: [email protected] MarkWest Energy Partners Announces Tender Offers for Its 6.75% Senior Notes due 2020, 6.5% Senior Notes due 2021
May 28, 2015	8-K	Entry into a Material Definitive Agreement, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): May 28, 2015 MARKWEST ENERGY PARTNERS, L.P. (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation or organization) 001-31239 (C
May 28, 2015	EX-10.1	EIGHTH AMENDMENT TO AMENDED AND RESTATED CREDIT AGREEMENT MARKWEST ENERGY PARTNERS, L.P., as the Borrower, WELLS FARGO BANK, NATIONAL ASSOCIATION, as Administrative Agent, The Agents and Lenders from Time to Time Parties Thereto, Dated as of May 28, Exhibit 10.1 EXECUTION EIGHTH AMENDMENT TO AMENDED AND RESTATED CREDIT AGREEMENT among MARKWEST ENERGY PARTNERS, L.P., as the Borrower, WELLS FARGO BANK, NATIONAL ASSOCIATION, as Administrative Agent, and The Agents and Lenders from Time to Time Parties Thereto, Dated as of May 28, 2015 WELLS FARGO SECURITIES, LLC and RBC CAPITAL MARKETS, as Joint Lead Arrangers and WELLS FARGO SECURITIES, LLC, an
May 28, 2015	FWP	Pricing Term Sheet 4.875% Senior Notes due 2025 ISSUER FREE WRITING PROSPECTUS Filed Pursuant to Rule 433 Registration No. 333-184605 May 28, 2015 Pricing Term Sheet 4.875% Senior Notes due 2025 Issuers: MarkWest Energy Partners, L.P. MarkWest Energy Finance Corporation Guarantees: Unconditionally guaranteed by certain subsidiaries of MarkWest Energy Partners, L.P. Security Type: Senior Unsecured Notes Form: SEC Registered Pricing Date: May 28,
May 21, 2015	8-K	Regulation FD Disclosure 8-K 1 a15-1179018k.htm 8-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): May 21, 2015 MARKWEST ENERGY PARTNERS, L.P. (Exact name of registrant as specified in its charter) Delaware 001-31239 27-0005456 (State or other jurisdictio
May 19, 2015	8-K	MarkWest Energy Partners 8-K (Current Report/Significant Event) UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): May 19, 2015 (May 14, 2015) MARKWEST ENERGY PARTNERS, L.P. (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation or organizatio
May 6, 2015	8-K	MarkWest Energy Partners 8-K (Current Report/Significant Event) UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): May 6, 2015 MARKWEST ENERGY PARTNERS, L.P. (Exact name of registrant as specified in its charter) Delaware 001-31239 27-0005456 (State or other jurisdiction of incorporation or organi
May 6, 2015	EX-99.1	MarkWest Energy Partners Reports First Quarter Financial Results Exhibit 99.1 MarkWest Energy Partners, L.P. Contact: Frank Semple, Chairman, President & CEO 1515 Arapahoe Street Nancy Buese, Executive VP and CFO Tower 1, Suite 1600 Josh Hallenbeck, VP of Finance & Treasurer Denver, Colorado 80202 Phone: (866) 858-0482 E-mail: [email protected] MarkWest Energy Partners Reports First Quarter Financial Results ? Reported DCF of $180.3 million and Adj
May 5, 2015	8-K	Current Report UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): May 5, 2015 (May 2, 2015) MARKWEST ENERGY PARTNERS, L.P. (Exact name of registrant as specified in its charter) Delaware 001-31239 27-0005456 (State or other jurisdiction of incorpora
May 5, 2015	EX-99.1	MarkWest Energy Partners Announces the Retirement in 2016 of Randy Nickerson, Chief Commercial Officer, and Other Senior Management Organizational Changes Exhibit 99.1 MarkWest Energy Partners, L.P. Contact: Frank Semple, Chairman, President & CEO 1515 Arapahoe Street Nancy Buese, Executive VP & CFO Tower 1, Suite 1600 Josh Hallenbeck, VP of Finance & Treasurer Denver, CO 80202 Phone: (866) 858-0482 E-mail: [email protected] MarkWest Energy Partners Announces the Retirement in 2016 of Randy Nickerson, Chief Commercial Officer, and Other
April 23, 2015	DEF 14A	MarkWest Energy Partners DEF 14A DEF 14A 1 a2224337zdef14a.htm DEF 14A Use these links to rapidly review the document TABLE OF CONTENTS Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ý Filed by a Party other than the Registrant o Check the appropriate box
April 23, 2015	DEFA14A	MarkWest Energy Partners DEFA14A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant x Filed by a Party other than the Registrant o Check the appropriate box: o Preliminary Proxy Statement o Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) o Defin
March 3, 2015	EX-1.1	MARKWEST ENERGY PARTNERS, L.P. MARKWEST ENERGY FINANCE CORPORATION 4.875% Senior Notes due 2024 Underwriting Agreement Exhibit 1.1 Execution Version $650,000,000 MARKWEST ENERGY PARTNERS, L.P. MARKWEST ENERGY FINANCE CORPORATION 4.875% Senior Notes due 2024 Underwriting Agreement February 26, 2015 Barclays Capital Inc. 745 Seventh Avenue New York, New York 10019 As Representative of the several Underwriters listed on Schedule III hereto Ladies and Gentlemen: MarkWest Energy Partners, L.P., a Delaware limited partn
March 3, 2015	8-K	Regulation FD Disclosure 8-K 1 a15-561318k.htm 8-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 26, 2015 MARKWEST ENERGY PARTNERS, L.P. (Exact name of registrant as specified in its charter) Delaware 001-31239 27-0005456 (State or other jurisdi
March 3, 2015	EX-99.3	MarkWest Energy Partners Closes Public Offering of Additional $650 Million of 4.875% Senior Notes Due 2024 Exhibit 99.3 MarkWest Energy Partners, L.P. Contact: Frank Semple, Chairman, President & CEO 1515 Arapahoe Street Nancy Buese, Executive VP & CFO Tower 1, Suite 1600 Josh Hallenbeck, VP of Finance & Treasurer Denver, CO 80202 Phone: (866) 858-0482 E-mail: [email protected] MarkWest Energy Partners Closes Public Offering of Additional $650 Million of 4.875% Senior Notes Due 2024 DENVER
March 3, 2015	EX-99.1	MarkWest Energy Partners Announces Public Offering of Additional $500 Million of 4.875% Senior Notes Due 2024 Exhibit 99.1 MarkWest Energy Partners, L.P. Contact: Frank Semple, Chairman, President & CEO 1515 Arapahoe Street Nancy Buese, Executive VP & CFO Tower 1, Suite 1600 Josh Hallenbeck, VP of Finance & Treasurer Denver, CO 80202 Phone: (866) 858-0482 E-mail: [email protected] MarkWest Energy Partners Announces Public Offering of Additional $500 Million of 4.875% Senior Notes Due 2024 DEN
March 3, 2015	EX-99.2	MarkWest Energy Partners Announces Pricing of an Upsized Public Offering of Additional $650 Million of 4.875% Senior Notes Due 2024 Exhibit 99.2 MarkWest Energy Partners, L.P. Contact: Frank Semple, Chairman, President & CEO 1515 Arapahoe Street Nancy Buese, Executive VP & CFO Tower 1, Suite 1600 Josh Hallenbeck, VP of Finance & Treasurer Denver, CO 80202 Phone: (866) 858-0482 E-mail: [email protected] MarkWest Energy Partners Announces Pricing of an Upsized Public Offering of Additional $650 Million of 4.875% Sen
February 26, 2015	FWP	Pricing Term Sheet 4.875% Senior Notes due 2024 ISSUER FREE WRITING PROSPECTUS Filed Pursuant to Rule 433 Registration No. 333-184605 February 26, 2015 Pricing Term Sheet 4.875% Senior Notes due 2024 Issuers: MarkWest Energy Partners, L.P. MarkWest Energy Finance Corporation Guarantees: Unconditionally guaranteed by certain subsidiaries of MarkWest Energy Partners, L.P. Security Type: Senior Unsecured Notes Form: SEC Registered Pricing Date: Fe
February 25, 2015	8-K	Regulation FD Disclosure UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): February 25, 2015 MARKWEST ENERGY PARTNERS, L.P. (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation or organization) 001-312
February 25, 2015	EX-99.1	MarkWest Energy Partners Reports Record 2014 Fourth Quarter and Full-Year Financial Results Exhibit 99.1 MarkWest Energy Partners, L.P. Contact: Frank Semple, Chairman, President & CEO 1515 Arapahoe Street Nancy Buese, Executive VP and CFO Tower 1, Suite 1600 Josh Hallenbeck, VP of Finance & Treasurer Denver, Colorado 80202 Phone: (866) 858-0482 E-mail: [email protected] MarkWest Energy Partners Reports Record 2014 Fourth Quarter and Full-Year Financial Results · Reported re
February 17, 2015	SC 13G/A	MWE / MarkWest Energy Partners, LP / ALPS ADVISORS INC - MARKWEST ENERGY PARTNERS, L.P. Passive Investment MarkWest Energy Partners, L.P. UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 4)* MarkWest Energy Partners, L.P. (Name of Issuer) Common Units (Title of Class of Securities) 570759100 (CUSIP Number) December 31, 2014 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to des
February 10, 2015	SC 13G	MWE / MarkWest Energy Partners, LP / TORTOISE CAPITAL ADVISORS, L.L.C. - MARKWEST ENERGY PARTNERS 13G 12.31.14 Passive Investment SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. )* Markwest Energy Partners, L.P. (Name of Issuer) Common Units Representing Limited Partner Interests (Title of Class of Securities) 570759100 (CUSIP Number) December 31, 2014 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate
February 4, 2015	8-K	Regulation FD Disclosure UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): February 4, 2015 MARKWEST ENERGY PARTNERS, L.P. (Exact name of registrant as specified in its charter) Delaware 001-31239 27-0005456 (State or other jurisdiction of (Commission File N
February 3, 2015	8-K	Entry into a Material Definitive Agreement, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): February 3, 2015 MARKWEST ENERGY PARTNERS, L.P. (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation or organization) 001-3123
February 3, 2015	EX-10.1	SEVENTH AMENDMENT TO AMENDED AND RESTATED CREDIT AGREEMENT MARKWEST ENERGY PARTNERS, L.P., as the Borrower, WELLS FARGO BANK, NATIONAL ASSOCIATION, as Administrative Agent, The Agents and Lenders from Time to Time Parties Thereto, Dated as of Februar Exhibit 10.1 EXECUTION SEVENTH AMENDMENT TO AMENDED AND RESTATED CREDIT AGREEMENT among MARKWEST ENERGY PARTNERS, L.P., as the Borrower, WELLS FARGO BANK, NATIONAL ASSOCIATION, as Administrative Agent, and The Agents and Lenders from Time to Time Parties Thereto, Dated as of February 3, 2015 WELLS FARGO SECURITIES, LLC and RBC CAPITAL MARKETS, as Joint Lead Arrangers and WELLS FARGO SECURITIES, LL
January 23, 2015	8-K	Current Report UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): January 23, 2015 (January 21, 2015) MARKWEST ENERGY PARTNERS, L.P. (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation or org
January 23, 2015	EX-99.1	MarkWest Energy Partners Increases Quarterly Cash Distribution Exhibit 99.1 MarkWest Energy Partners, L.P. Contact: Frank Semple, Chairman, President & CEO 1515 Arapahoe Street Nancy Buese, Executive VP & CFO Tower 1, Suite 1600 Josh Hallenbeck, VP of Finance & Treasurer Denver, CO 80202 Phone: (866) 858-0482 E-mail: [email protected] MarkWest Energy Partners Increases Quarterly Cash Distribution DENVER—January 21, 2015—MarkWest Energy Partners,
January 21, 2015	SC 13G	MWE / MarkWest Energy Partners, LP / UBS Group AG - SC 13G Passive Investment SC 13G UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Information to be included in Statements filed pursuant to Rules 13d-1(b), (c) and (d) and amendments thereto filed pursuant to Rule 13d-2(b) (Amendment No. ) Markwest Energy Partners LP (Name of Issuer) Common Stock (Title of Class of Securities) 570759100 (CUSIP Number) December 31, 2014 (Date of Event Th
January 14, 2015	SC 13G/A	MWE / MarkWest Energy Partners, LP / KAYNE ANDERSON CAPITAL ADVISORS LP - KAYNE ANDERSON CAPITAL ADVISORS, L.P. SC 13G A NO 16 1-13-2015 (MARKWEST ENERGY PARTNERS, L.P.) Passive Investment UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G UNDER THE SECURITIES EXCHANGE ACT OF 1934 (AMENDMENT NO. 16) MarkWest Energy Partners, L.P. (Name of Issuer) COMMON UNITS (Title of Class of Securities) 570759100 (CUSIP Number) Check the following box if a fee is being paid with this statement ☐. (A fee is not required only if the filing person: (1) has a previou
December 12, 2014	CORRESP	MWE / MarkWest Energy Partners, LP CORRESP - - MarkWest Energy Partners, L.P. 1515 Arapahoe Street Tower 1 Suite 1600 Denver, CO 80202 December 12, 2014 VIA EDGAR Division of Corporation Finance United States Securities and Exchange Commission 100 F Street, NE Washington, D.C. 20549 Attn: Karl Hiller Branch Chief, Division of Corporation Finance Re: MarkWest Energy Partners, L.P. Form 10-K for the Fiscal Year ended December 31, 2013 Filed Febr
November 21, 2014	EX-99.1	MarkWest Energy Partners Announces Public Offering of $500 Million of Senior Notes Due 2024 Exhibit 99.1 MarkWest Energy Partners, L.P. Contact: Frank Semple, Chairman, President & CEO 1515 Arapahoe Street Nancy Buese, Executive VP & CFO Tower 1, Suite 1600 Josh Hallenbeck, VP of Finance & Treasurer Denver, CO 80202 Phone: (866) 858-0482 E-mail: [email protected] MarkWest Energy Partners Announces Public Offering of $500 Million of Senior Notes Due 2024 DENVER—November 18, 2
November 21, 2014	EX-4.1	MARKWEST ENERGY PARTNERS, L.P., MARKWEST ENERGY FINANCE CORPORATION, as Issuers, THE SUBSIDIARIES NAMED HEREIN, as Subsidiary Guarantors WELLS FARGO BANK, NATIONAL ASSOCIATION, as Trustee 4.875% Senior Notes due 2024 THIRTEENTH SUPPLEMENTAL INDENTURE EX-4.1 3 a14-233777ex4d1.htm EX-4.1 Exhibit 4.1 MARKWEST ENERGY PARTNERS, L.P., MARKWEST ENERGY FINANCE CORPORATION, as Issuers, THE SUBSIDIARIES NAMED HEREIN, as Subsidiary Guarantors and WELLS FARGO BANK, NATIONAL ASSOCIATION, as Trustee 4.875% Senior Notes due 2024 THIRTEENTH SUPPLEMENTAL INDENTURE Dated as of November 21, 2014 CROSS-REFERENCE TABLE* Trust Indenture Act Section Supplemental Ind
November 21, 2014	8-K	Regulation FD Disclosure UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): November 18, 2014 MARKWEST ENERGY PARTNERS, L.P. (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation or organization) 001-312
November 21, 2014	EX-99.3	MarkWest Energy Partners Closes Public Offering of $500 Million of 4.875% Senior Notes Due 2024 EX-99.3 7 a14-233777ex99d3.htm EX-99.3 Exhibit 99.3 MarkWest Energy Partners, L.P. Contact: Frank Semple, Chairman, President & CEO 1515 Arapahoe Street Nancy Buese, Executive VP & CFO Tower 1, Suite 1600 Josh Hallenbeck, VP of Finance & Treasurer Denver, CO 80202 Phone: (866) 858-0482 E-mail: [email protected] MarkWest Energy Partners Closes Public Offering of $500 Million of 4.875%
November 21, 2014	EX-1.1	$500,000,000 MARKWEST ENERGY PARTNERS, L.P. MARKWEST ENERGY FINANCE CORPORATION 4.875% Senior Notes due 2024 Underwriting Agreement Exhibit 1.1 Execution Version $500,000,000 MARKWEST ENERGY PARTNERS, L.P. MARKWEST ENERGY FINANCE CORPORATION 4.875% Senior Notes due 2024 Underwriting Agreement November 18, 2014 Wells Fargo Securities, LLC 301 S. College Street Charlotte, North Carolina 28288 As Representative of the several Underwriters listed on Schedule III hereto Ladies and Gentlemen: MarkWest Energy Partners, L.P., a Delawa
November 21, 2014	EX-99.2	MarkWest Energy Partners Announces Pricing of an Offering of $500 Million of 4.875% Senior Notes Due 2024 Exhibit 99.2 MarkWest Energy Partners, L.P. Contact: Frank Semple, Chairman, President & CEO 1515 Arapahoe Street Nancy Buese, Executive VP & CFO Tower 1, Suite 1600 Josh Hallenbeck, VP of Finance & Treasurer Denver, CO 80202 Phone: (866) 858-0482 E-mail: [email protected] MarkWest Energy Partners Announces Pricing of an Offering of $500 Million of 4.875% Senior Notes Due 2024 DENVER—
November 19, 2014	424B5	Common Units Representing Limited Partner Interests Having an Aggregate Offering Price of Up to $1,500,000,000 3,990,878 Common Units Representing Limited Partner Interests Offered by the Selling Unitholder Use these links to rapidly review the document TABLE OF CONTENTS TABLE OF CONTENTS Table of Contents Filed pursuant to Rule 424(b)(5) Registration No.
November 19, 2014	8-K	Current Report UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): November 19, 2014 MARKWEST ENERGY PARTNERS, L.P. (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation or organization) 001-312
November 19, 2014	EX-1.1	MARKWEST ENERGY PARTNERS, L.P. Common Units Representing Limited Partner Interests EQUITY DISTRIBUTION AGREEMENT Exhibit 1.1 MARKWEST ENERGY PARTNERS, L.P. Common Units Representing Limited Partner Interests EQUITY DISTRIBUTION AGREEMENT November 19, 2014 Citigroup Global Markets Inc. 388 Greenwich Street New York, New York, 10013 J.P. Morgan Securities LLC 383 Madison Avenue New York, New York 10179 RBC Capital Markets, LLC 200 Vesey Street Three World Financial Center New York, New York 10281 UBS Securitie
November 18, 2014	FWP	Pricing Term Sheet 4.875% Senior Notes due 2024 ISSUER FREE WRITING PROSPECTUS Filed Pursuant to Rule 433 Registration No. 333-184605 November 18, 2014 Pricing Term Sheet 4.875% Senior Notes due 2024 Issuers: MarkWest Energy Partners, L.P. MarkWest Energy Finance Corporation Guarantees: Unconditionally guaranteed by certain subsidiaries of MarkWest Energy Partners, L.P. Security Type: Senior Unsecured Notes Form: SEC Registered Pricing Date: No
November 18, 2014	CORRESP	MWE / MarkWest Energy Partners, LP CORRESP - - MARKWEST ENERGY PARTNERS, L.P. 1515 Arapahoe Street Tower 1, Suite 1600 Denver, Colorado 80202 November 18, 2014 Via EDGAR H. Roger Schwall Assistant Director United States Securities and Exchange Commission Division of Corporation Finance Mail Stop 3561 100 F Street, N.E. Washington, D.C. 20549 Re: MarkWest Energy Partners, L.P. Registration Statement on Form S-3 Filed October 10, 2014 File No. 3
November 17, 2014	CORRESP	MWE / MarkWest Energy Partners, LP CORRESP - - MARKWEST ENERGY PARTNERS, L.P. 1515 Arapahoe Street Tower 1, Suite 1600 Denver, Colorado 80202 November 17, 2014 H. Roger Schwall Assistant Director United States Securities and Exchange Commission Division of Corporation Finance 100 F Street, N.E. Washington, D.C. 20549-3561 Re: MarkWest Energy Partners, L.P. Registration Statement on Form S-3 Filed October 10, 2014 File No. 333-199280 Ladies and
November 17, 2014	S-3/A	MWE / MarkWest Energy Partners, LP S-3/A - - S-3/A QuickLinks - Click here to rapidly navigate through this document As filed with the Securities and Exchange Commission on November 17, 2014 Registration No.
November 13, 2014	8-K	Regulation FD Disclosure UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): November 13, 2014 MARKWEST ENERGY PARTNERS, L.P. (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation or organization) 001-312
November 6, 2014	EX-99.1	MarkWest Energy Partners Reports Record Third Quarter 2014 Financial Results, Increased 2014 Distributable Cash Flow Forecast & Provides 2015 Financial Guidance Exhibit 99.1 MarkWest Energy Partners, L.P. Contact: Frank Semple, Chairman, President & CEO 1515 Arapahoe Street Nancy Buese, Executive VP and CFO Tower 1, Suite 1600 Josh Hallenbeck, VP of Finance & Treasurer Denver, Colorado 80202 Phone: (866) 858-0482 E-mail: [email protected] MarkWest Energy Partners Reports Record Third Quarter 2014 Financial Results, Increased 2014 Distributabl
November 6, 2014	8-K	Regulation FD Disclosure UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): November 6, 2014 (November 5, 2014) MARKWEST ENERGY PARTNERS, L.P. (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation or org
October 27, 2014	8-K	Current Report UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): October 27, 2014 (October 22, 2014) MARKWEST ENERGY PARTNERS, L.P. (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation or org
October 27, 2014	EX-99.1	MarkWest Energy Partners Increases Quarterly Cash Distribution and 2014 Distributable Cash Flow Forecast Exhibit 99.1 MarkWest Energy Partners, L.P. Contact: Frank Semple, Chairman, President & CEO 1515 Arapahoe Street Nancy Buese, Executive VP & CFO Tower 1, Suite 1600 Josh Hallenbeck, VP of Finance & Treasurer Denver, CO 80202 Phone: (866) 858-0482 E-mail: [email protected] MarkWest Energy Partners Increases Quarterly Cash Distribution and 2014 Distributable Cash Flow Forecast DENVER—O
October 10, 2014	S-3	MWE / MarkWest Energy Partners, LP S-3 - - S-3 Use these links to rapidly review the document TABLE OF CONTENTS Table of Contents As filed with the Securities and Exchange Commission on October 10, 2014 Registration No.
September 26, 2014	CORRESP	MWE / MarkWest Energy Partners, LP CORRESP - - MarkWest Energy Partners, L.P. 1515 Arapahoe Street Tower 1 Suite 1600 Denver, CO 80202 September 26, 2014 VIA EDGAR Division of Corporation Finance United States Securities and Exchange Commission 100 F Street, NE Washington, D.C. 20549 Attn: Karl Hiller Branch Chief, Division of Corporation Finance Re: MarkWest Energy Partners, L.P. Form 10-K for the Fiscal Year ended December 31, 2013 Filed Feb
September 17, 2014	8-K	Regulation FD Disclosure UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): September 17, 2014 MARKWEST ENERGY PARTNERS, L.P. (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation or organization) 001-31
August 19, 2014	CORRESP	MWE / MarkWest Energy Partners, LP CORRESP - - MarkWest Energy Partners, L.P. 1515 Arapahoe Street Tower 1 Suite 1600 Denver, CO 80202 August 19, 2014 VIA EDGAR Division of Corporation Finance United States Securities and Exchange Commission 100 F Street, NE Washington, D.C. 20549 Attn: Karl Hiller Branch Chief, Division of Corporation Finance Re: MarkWest Energy Partners, L.P. Form 10-K for the Fiscal Year ended December 31, 2013 Filed Februa
August 7, 2014	8-K	Regulation FD Disclosure UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): August 7, 2014 (August 6, 2014) MARKWEST ENERGY PARTNERS, L.P. (Exact name of registrant as specified in its charter) Delaware 001-31239 27-0005456 (State or other jurisdiction of (Co
August 7, 2014	EX-99.1	MarkWest Energy Partners Announces Major Expansion Projects and Reports Record Financial and Operational Results for Second Quarter 2014 Exhibit 99.1 MarkWest Energy Partners, L.P. Contact: Frank Semple, Chairman, President & CEO 1515 Arapahoe Street Nancy Buese, Executive VP and CFO Tower 1, Suite 1600 Josh Hallenbeck, VP of Finance & Treasurer Denver, Colorado 80202 Phone: (866) 858-0482 E-mail: [email protected] MarkWest Energy Partners Announces Major Expansion Projects and Reports Record Financial and Operational
July 29, 2014	EX-99.1	MarkWest Energy Partners Increases Quarterly Cash Distribution Exhibit 99.1 MarkWest Energy Partners, L.P. Contact: Frank Semple, Chairman, President & CEO 1515 Arapahoe Street Nancy Buese, Executive VP & CFO Tower 1, Suite 1600 Josh Hallenbeck, VP of Finance & Treasurer Denver, CO 80202 Phone: (866) 858-0482 E-mail: [email protected] MarkWest Energy Partners Increases Quarterly Cash Distribution DENVER—July 24, 2014—MarkWest Energy Partners, L.P
July 29, 2014	8-K	8-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): July 28, 2014 (July 24, 2014) MARKWEST ENERGY PARTNERS, L.P. (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation or organizat
June 11, 2014	8-K	Current Report 8-K 1 a14-1510718k.htm 8-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): June 11, 2014 (June 6, 2014) MARKWEST ENERGY PARTNERS, L.P. (Exact name of registrant as specified in its charter) Delaware 001-31239 27-0005456 (State or o
June 6, 2014	8-K	Regulation FD Disclosure - 8-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): June 6, 2014 MARKWEST ENERGY PARTNERS, L.P. (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation or organization) 001-31239 (C
May 21, 2014	8-K	Regulation FD Disclosure - 8-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): May 21, 2014 MARKWEST ENERGY PARTNERS, L.P. (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation or organization) 001-31239 (C
May 8, 2014	8-K	Current Report 8-K 1 a14-1225428k.htm 8-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): May 8, 2014 (May 7, 2014) MARKWEST ENERGY PARTNERS, L.P. (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of inc
May 8, 2014	8-K	Regulation FD Disclosure UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): May 8, 2014 MARKWEST ENERGY PARTNERS, L.P. (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation or organization) 001-31239 (Co
May 8, 2014	EX-99.1	FIRST QUARTER 2014 CONFERENCE CALL PRESENTATION MAY 8, 2014 Exhibit 99.1 FIRST QUARTER 2014 CONFERENCE CALL PRESENTATION MAY 8, 2014 Forward-Looking Statements This presentation contains forward-looking statements and information. These forward-looking statements, which in many instances can be identified by words like “could,” “may,” “will,” “should,” “expects,” “plans,” “project,” “anticipates,” “believes,” “planned,” “proposed,” “potential,” and other c
May 8, 2014	EX-99.1	MarkWest Energy Partners Reports First Quarter Financial Results Exhibit 99.1 MarkWest Energy Partners, L.P. Contact: Frank Semple, Chairman, President & CEO 1515 Arapahoe Street Nancy Buese, Executive VP and CFO Tower 1, Suite 1600 Josh Hallenbeck, VP of Finance & Treasurer Denver, Colorado 80202 Phone: (866) 858-0482 E-mail: [email protected] MarkWest Energy Partners Reports First Quarter Financial Results · Placed into service three major infras
April 28, 2014	EX-99.1	MarkWest Energy Partners Increases Quarterly Cash Distribution Exhibit 99.1 MarkWest Energy Partners, L.P. Contact: Frank Semple, Chairman, President & CEO 1515 Arapahoe Street Nancy Buese, Executive VP & CFO Tower 1, Suite 1600 Josh Hallenbeck, VP of Finance & Treasurer Denver, CO 80202 Phone: (866) 858-0482 E-mail: [email protected] MarkWest Energy Partners Increases Quarterly Cash Distribution DENVER—April 22, 2014—MarkWest Energy Partners, L.
April 28, 2014	8-K	- 8-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): April 28, 2014 (April 22, 2014) MARKWEST ENERGY PARTNERS, L.P. (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation or organiz
April 25, 2014	DEF 14A	- DEF 14A Use these links to rapidly review the document TABLE OF CONTENTS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.
March 20, 2014	EX-10.1	NEW LENDER AGREEMENT AND SIXTH AMENDMENT TO AMENDED AND RESTATED CREDIT AGREEMENT MARKWEST ENERGY PARTNERS, L.P., as the Borrower, WELLS FARGO BANK, NATIONAL ASSOCIATION, as Administrative Agent, The Agents and Lenders from Time to Time Parties There Exhibit 10.1 EXECUTION NEW LENDER AGREEMENT AND SIXTH AMENDMENT TO AMENDED AND RESTATED CREDIT AGREEMENT among MARKWEST ENERGY PARTNERS, L.P., as the Borrower, WELLS FARGO BANK, NATIONAL ASSOCIATION, as Administrative Agent, and The Agents and Lenders from Time to Time Parties Thereto, Dated as of March 20, 2014 WELLS FARGO SECURITIES, LLC and RBC CAPITAL MARKETS, as Joint Lead Arrangers and WELLS
March 20, 2014	8-K	Regulation FD Disclosure, Entry into a Material Definitive Agreement, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant - 8-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): March 20, 2014 MARKWEST ENERGY PARTNERS, L.P. (Exact name of registrant as specified in its charter) Delaware 001-31239 27-0005456 (State or other jurisdiction of incorporation or org
March 20, 2014	EX-99.1	MarkWest Energy Partners Increases Revolving Credit Facility to $1.3 Billion and Extends Maturity to 2019 Exhibit 99.1 MarkWest Energy Partners, L.P. Contact: Frank Semple, Chairman, President & CEO 1515 Arapahoe Street Nancy Buese, Executive VP & CFO Tower 1, Suite 1600 Josh Hallenbeck, VP of Finance & Treasurer Denver, CO 80202 Phone: (866) 858-0482 E-mail: [email protected] MarkWest Energy Partners Increases Revolving Credit Facility to $1.3 Billion and Extends Maturity to 2019 DENVER—
March 11, 2014	424B5	Common Units Representing Limited Partner Interests Having an Aggregate Offering Price of Up to $1,200,000,000 4,031,075 Common Units offered by the Selling Unitholder Use these links to rapidly review the document TABLE OF CONTENTS TABLE OF CONTENTS TABLE OF CONTENTS Table of Contents Filed pursuant to Rule 424(b)(5) Registration No.
March 11, 2014	EX-1.1	MARKWEST ENERGY PARTNERS, L.P. Common Units Representing Limited Partner Interests EQUITY DISTRIBUTION AGREEMENT Exhibit 1.1 Execution Version MARKWEST ENERGY PARTNERS, L.P. Common Units Representing Limited Partner Interests EQUITY DISTRIBUTION AGREEMENT March 11, 2014 Citigroup Global Markets Inc. 388 Greenwich Street New York, New York, 10013 J.P. Morgan Securities LLC 383 Madison Avenue New York, New York 10179 Merrill Lynch, Pierce, Fenner & Smith Incorporated One Bryant Park, New York, NY 10036 UBS Sec
March 11, 2014	8-K	Current Report UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): March 11, 2014 MARKWEST ENERGY PARTNERS, L.P. (Exact name of registrant as specified in its charter) Delaware 001-31239 27-0005456 (State or other jurisdiction of incorporation or org
March 5, 2014	8-K	Regulation FD Disclosure - 8-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): March 5, 2014 MARKWEST ENERGY PARTNERS, L.P. (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation or organization) 001-31239 (
March 5, 2014	EX-99.1	MORGAN STANLEY MIDSTREAM MLP & DIVERSIFIED NATURAL GAS EVENT MARCH 5, 2014 Exhibit 99.1 MORGAN STANLEY MIDSTREAM MLP & DIVERSIFIED NATURAL GAS EVENT MARCH 5, 2014 Forward-Looking Statements This presentation contains forward-looking statements and information. These forward-looking statements, which in many instances can be identified by words like “could,” “may,” “will,” “should,” “expects,” “plans,” “project,” “anticipates,” “believes,” “planned,” “proposed,” “potentia
February 27, 2014	8-K	Regulation FD Disclosure UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): February 27, 2014 (February 26, 2014) MARKWEST ENERGY PARTNERS, L.P. (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation or o
February 27, 2014	EX-99.2	FOURTH QUARTER 2013 CONFERENCE CALL PRESENTATION FEBRUARY 27, 2014 Exhibit 99.2 FOURTH QUARTER 2013 CONFERENCE CALL PRESENTATION FEBRUARY 27, 2014 Forward-Looking Statements This presentation contains forward-looking statements and information. These forward-looking statements, which in many instances can be identified by words like “could,” “may,” “will,” “should,” “expects,” “plans,” “project,” “anticipates,” “believes,” “planned,” “proposed,” “potential,” and
February 27, 2014	EX-99.1	MarkWest Energy Partners Reports Fourth Quarter and Full Year Financial Results Exhibit 99.1 MarkWest Energy Partners, L.P. Contact: Frank Semple, Chairman, President & CEO 1515 Arapahoe Street Nancy Buese, Executive VP and CFO Tower 1, Suite 1600 Josh Hallenbeck, VP of Finance & Treasurer Denver, Colorado 80202 Phone: (866) 858-0482 E-mail: [email protected] MarkWest Energy Partners Reports Fourth Quarter and Full Year Financial Results · Increased total process
February 26, 2014	10-K	MarkWest Energy Partners 10-K (Annual Report) Use these links to rapidly review the document Table of Contents ITEM 8. Financial Statements and Supplementary Data Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ? ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2013 or o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(
February 18, 2014	S-3	- S-3 Use these links to rapidly review the document TABLE OF CONTENTS Table of Contents As filed with the Securities and Exchange Commission on February 18, 2014 Registration No.
February 14, 2014	SC 13G/A	MWE / MarkWest Energy Partners, LP / ALPS ADVISORS INC - MARKWEST ENERGY PARTNERS L P Passive Investment MARKWEST ENERGY PARTNERS L P UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.
February 6, 2014	8-K	Regulation FD Disclosure UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): February 6, 2014 MARKWEST ENERGY PARTNERS, L.P. (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation or organization) 001-3123
February 6, 2014	EX-99.1	INVESTOR PRESENTATION FEBRUARY 2014 Exhibit 99.1 INVESTOR PRESENTATION FEBRUARY 2014 Forward-Looking Statements This presentation contains forward-looking statements and information. These forward-looking statements, which in many instances can be identified by words like “could,” “may,” “will,” “should,” “expects,” “plans,” “project,” “anticipates,” “believes,” “planned,” “proposed,” “potential,” and other comparable words, regardi
February 5, 2014	SC 13G/A	MWE / MarkWest Energy Partners, LP / KAYNE ANDERSON CAPITAL ADVISORS LP - KAYNE ANDERSON CAPITAL ADVISORS LP SC 13G A NO 15 2-4-2014 (MARKWEST ENERGY PARTNERS, LP) Passive Investment UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G UNDER THE SECURITIES EXCHANGE ACT OF 1934 (AMENDMENT NO. 15) MarkWest Energy Partners, L.P. (Name of Issuer) COMMON UNITS (Title of Class of Securities) 570759100 (CUSIP Number) Check the following box if a fee is being paid with this statement [ ]. (A fee is not required only if the filing person: (1) has a previ
January 24, 2014	EX-99.1	MarkWest Energy Partners Increases Quarterly Cash Distribution Exhibit 99.1 MarkWest Energy Partners, L.P. Contact: Frank Semple, Chairman, President & CEO 1515 Arapahoe Street Nancy Buese, Executive VP & CFO Tower 1, Suite 1600 Josh Hallenbeck, VP of Finance & Treasurer Denver, CO 80202 Phone: (866) 858-0482 E-mail: [email protected] MarkWest Energy Partners Increases Quarterly Cash Distribution DENVER—January 22, 2014—MarkWest Energy Partners,
January 24, 2014	8-K	- 8-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): January 24, 2014 (January 22, 2014) MARKWEST ENERGY PARTNERS, L.P. (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation or org
December 23, 2013	8-K	Regulation FD Disclosure - 8-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 December 23, 2013 (December 17, 2013) Date of Report (Date of earliest event reported) MARKWEST ENERGY PARTNERS, L.P. (Exact name of registrant as specified in its charter) Delaware 001-31239 27-0005456 (State or other jurisdiction o
December 23, 2013	EX-99.1	MarkWest Energy Partners Announces Sale of Common Units under Equity Distribution Agreement Exhibit 99.1 MarkWest Energy Partners, L.P. Contact: Frank Semple, Chairman, President & CEO 1515 Arapahoe Street Nancy Buese, Executive VP and CFO Tower 1, Suite 1600 Josh Hallenbeck, VP of Finance & Treasurer Denver, CO 80202 Phone: (866) 858-0482 E-mail: [email protected] MarkWest Energy Partners Announces Sale of Common Units under Equity Distribution Agreement DENVER—(BUSINESS WI
December 23, 2013	EX-1.1	MARKWEST ENERGY PARTNERS, L.P. Common Units TERMS AGREEMENT EXHIBIT 1.1 MARKWEST ENERGY PARTNERS, L.P. Common Units TERMS AGREEMENT December 17, 2013 Citigroup Global Markets Inc. 388 Greenwich Street New York, New York, 10013 Ladies and Gentlemen: MarkWest Energy Partners, L.P. (the “Partnership”) and MarkWest Energy Partners, L.P., in its capacity as custodian for M&R MWE Liberty, LLC (the “Custodian”) propose, subject to the terms and conditions stated
December 17, 2013	FWP	5,000,000 Common Units Representing Limited Partner Interests FWP 1 a13-265591fwp.htm FWP ISSUER FREE WRITING PROSPECTUS Filed Pursuant to Rule 433 Registration No. 333-186011 and 333-190438 December 17, 2013 5,000,000 Common Units Representing Limited Partner Interests We are offering 4,750,000 common units representing limited partner interests in us (“Common Units”), and the selling unitholder is offering 250,000 Common Units, in each case pursuant to an
December 13, 2013	EX-10.1	FIFTH AMENDMENT TO AMENDED AND RESTATED CREDIT AGREEMENT Exhibit 10.1 FIFTH AMENDMENT TO AMENDED AND RESTATED CREDIT AGREEMENT among MARKWEST ENERGY PARTNERS, L.P., as the Borrower, WELLS FARGO BANK, NATIONAL ASSOCIATION, as Administrative Agent, and The Agents and Lenders from Time to Time Parties Thereto, Dated as of December 11, 2013 WELLS FARGO SECURITIES, LLC and RBC CAPITAL MARKETS, as Joint Lead Arrangers and WELLS FARGO SECURITIES, LLC, and RBC
December 13, 2013	8-K	Entry into a Material Definitive Agreement, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant - 8-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): December 11, 2013 MARKWEST ENERGY PARTNERS, L.P. (Exact name of registrant as specified in its charter) Delaware 001-31239 27-0005456 (State or other jurisdiction of incorporation or
December 10, 2013	EX-99.1	WELLS FARGO 2013 ENERGY SYMPOSIUM DECEMBER 2013 Exhibit 99.1 WELLS FARGO 2013 ENERGY SYMPOSIUM DECEMBER 2013 Forward-Looking Statements This presentation contains forward-looking statements and information. These forward-looking statements, which in many instances can be identified by words like “could,” “may,” “will,” “should,” “expects,” “plans,” “project,” “anticipates,” “believes,” “planned,” “proposed,” “potential,” and other comparable wo
December 10, 2013	8-K	Regulation FD Disclosure - 8-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): December 10, 2013 MARKWEST ENERGY PARTNERS, L.P. (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation or organization) 001-312
November 15, 2013	8-K	Regulation FD Disclosure UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): November 15, 2013 MARKWEST ENERGY PARTNERS, L.P. (Exact name of registrant as specified in its charter) Delaware 001-31239 27-0005456 (State or other jurisdiction of (Commission File
November 15, 2013	EX-99.1	DUG EAST NOVEMBER 2013 Exhibit 99.1 DUG EAST NOVEMBER 2013 Forward-Looking Statements This presentation contains forward-looking statements and information. These forward-looking statements, which in many instances can be identified by words like “could,” “may,” “will,” “should,” “expects,” “plans,” “project,” “anticipates,” “believes,” “planned,” “proposed,” “potential,” and other comparable words, regarding future or
November 13, 2013	EX-99.1	MarkWest Energy Partners Reports Third Quarter Financial Results; Places into Service Three Major Facilities; Announces Additional Midstream Infrastructure Project in the Marcellus Shale Exhibit 99.1 MarkWest Energy Partners, L.P. Contact: Frank Semple, Chairman, President & CEO 1515 Arapahoe Street Nancy Buese, Executive VP and CFO Tower 1, Suite 1600 Josh Hallenbeck, VP of Finance & Treasurer Denver, Colorado 80202 Phone: (866) 858-0482 E-mail: [email protected] MarkWest Energy Partners Reports Third Quarter Financial Results; Places into Service Three Major Facilit
November 13, 2013	8-K	- 8-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): November 12, 2013 MARKWEST ENERGY PARTNERS, L.P. (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation or organization) 001-312
October 25, 2013	EX-99.1	MarkWest Energy Partners Increases Quarterly Cash Distribution Exhibit 99.1 MarkWest Energy Partners, L.P. Contact: Frank Semple, Chairman, President & CEO 1515 Arapahoe Street Nancy Buese, Executive VP & CFO Tower 1, Suite 1600 Josh Hallenbeck, VP of Finance & Treasurer Denver, Colorado 80202 Phone: (866) 858-0482 E-mail: [email protected] MarkWest Energy Partners Increases Quarterly Cash Distribution DENVER—October 23, 2013—MarkWest Energy Part
October 25, 2013	8-K	- 8-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): October 23, 2013 MARKWEST ENERGY PARTNERS, L.P. (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation or organization) 001-3123
September 13, 2013	SC 13G	MWE / MarkWest Energy Partners, LP / ALPS ADVISORS INC - MARKWEST ENERGY PARTNERS LP Passive Investment SC 13G 1 d597945dsc13g.htm MARKWEST ENERGY PARTNERS LP UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. )* MarkWest Energy Partners, L.P. (Name of Issuer) Common Units (Title of Class of Securities) 570759100 (CUSIP Number) September 13, 2013 (Date of Event Which Requires Filing of this Statement) Check th
September 12, 2013	8-K	Regulation FD Disclosure - 8-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): September 12, 2013 MARKWEST ENERGY PARTNERS, L.P. (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation or organization) 001-31
September 12, 2013	EX-99.1	BARCLAYS CEO ENERGY-POWER CONFERENCE SEPTEMBER 2013 Exhibit 99.1 BARCLAYS CEO ENERGY-POWER CONFERENCE SEPTEMBER 2013 Forward-Looking Statements This presentation contains forward-looking statements and information. These forward-looking statements, which in many instances can be identified by words like “could,” “may,” “will,” “should,” “expects,” “plans,” “project,” “anticipates,” “believes,” “planned,” “proposed,” “potential,” and other comparabl

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