Introduction

This page provides a comprehensive analysis of the known insider trading history of Matthew Linnington. Insiders are officers, directors, or significant investors in a company. It is illegal for insiders to make trades in their companies based on specific, non-public information. This does not mean it is illegal for them to make any trades in their own companies. However, they must report all trades to the SEC via a Form 4. Despite these restrictions, academic research suggests that insiders - in general - tend to outperform the market in their own companies.

Average Trade Profitability

The average trade profitability is the average return of all the open market purchases made by the insider in the last three years. To calculate this, we examine every open-market, unplanned purchase made by the insider, excluding all trades that were marked as part of a 10b5-1 trading plan. We then calculate the average performance of those trades over 3, 6, and 12 months, averaging each of those durations to generate a final performance metric for each trade. Finally, we average all of the performance metrics to calculate a performance metric for the insider. This list only includes insiders that have made at least three trades in the last two years.

If this insiders trade profitability is "N/A", then the insider either has not made any open-market purchases in the last three years, or the trades they’ve made are too recent to calculate a reliable performance metric.

Update Frequency: Daily

See the list of most profitable insider traders.

Companies with Reported Insider Positions

The SEC filings indicate Matthew Linnington has reported holdings or trades in the following companies:

Security Title Latest Reported Holdings
US:CSGP / CoStar Group, Inc. Executive VP, Sales 19,766
How to Interpret the Charts

The following charts show the stock performance of securities subsequent to each open-market, non-planned trade made by Matthew Linnington. Non-planned trade are trades that were not made as part of a 10b5-1 trading plan. The stock performance is charted as cumulative percent change in share price. For example, if an insider trade was made on January 1, 2019, the chart will show the daily percent change of the security to the present day. If the share price were to go from $10 to $15 during this time, the cumulative percent change in share price would be 50%. A change in price from $10 to $20 would be 100%, and a change in price of $10 to $5 would be -50%.

Ultimately, we are trying to determine how closely the insider’s trades correlate to excess returns (positive or negative) in the share price in order to see if the insider is timing their trades to profit from insider information. Consider the situation where an insider was doing this. In this situation, we would expect either (a) positive returns after purchases, or (b) negative returns after sales. In the case of (a), the PURCHASE chart would show a series of upwardly sloping curves, indicating positive returns after each purchase transaction. In the case of (b), the SALE chart would show a series of downward sloping curves, indicating negative returns after each sale transaction.

However, this alone is not enough to draw conclusions. If, for example, the share price of the company was in a non-cyclical climb over many years, then we would expect all the post-purchase plots to be upwardly sloping. Likewise, non-cyclical declines over many years would result in downward sloping post-trade plots. Neither of these charts would suggest insider trading activity.

The strongest indicator would be a situation where the share price was extremely cyclical, and there were both positive signals in the PURCHASE chart and negative plots on the SALE chart. This situation would be highly suggestive of an insider that was timing trades to their financial advantage.

Insider Trading History

This table shows the complete list of insider trades made by Matthew Linnington as disclosed to the Securities Exchange Commission (SEC).

File Date Tran Date Form Ticker Security Code 10b5-1 Shares Remaining Shares Percent
Change
Share
Price
Tran
Value
Remaining
Value
2020-08-13 2020-08-12 4 CSGP COSTAR GROUP, INC.
Common Stock, par value $0.01 per share
S - Sale -2,419 19,766 -10.90 826.32 -1,998,868 16,333,041
2020-04-02 2020-03-31 4 CSGP COSTAR GROUP, INC.
Common Stock, par value $0.01 per share
F - Taxes -1,051 22,185 -4.52 599.99 -630,589 13,310,778
2020-03-03 2020-03-02 4 CSGP COSTAR GROUP, INC.
Common Stock, par value $0.01 per share
F - Taxes -1,957 23,236 -7.77 667.59 -1,306,474 15,512,121
2020-03-03 2020-02-29 4 CSGP COSTAR GROUP, INC.
Common Stock, par value $0.01 per share
F - Taxes -446 25,193 -1.74 667.59 -297,745 16,818,595
2020-02-19 2020-02-15 4 CSGP COSTAR GROUP, INC.
Common Stock, par value $0.01 per share
F - Taxes -326 25,639 -1.26 731.37 -238,427 18,751,595
2020-02-10 2020-02-06 4 CSGP COSTAR GROUP, INC.
Option to Acquire Common Stock
A - Award 2,900 2,900
2020-02-10 2020-02-06 4 CSGP COSTAR GROUP, INC.
Common Stock, par value $0.01 per share
A - Award 4,160 25,965 19.08
2019-08-01 2019-07-31 4 CSGP COSTAR GROUP, INC.
Option to Acquire Common Stock
M - Exercise -2,000 4,000 -33.33
2019-08-01 2019-07-31 4 CSGP COSTAR GROUP, INC.
Option to Acquire Common Stock
M - Exercise -7,533 3,767 -66.66
2019-08-01 2019-07-31 4 CSGP COSTAR GROUP, INC.
Option to Acquire Common Stock
M - Exercise -3,500 0 -100.00
2019-08-01 2019-07-31 4 CSGP COSTAR GROUP, INC.
Common Stock, par value $0.01 per share
S - Sale -14,651 21,805 -40.19 617.39 -9,045,381 13,462,189
2019-08-01 2019-07-31 4 CSGP COSTAR GROUP, INC.
Common Stock, par value $0.01 per share
M - Exercise 2,000 36,456 5.80 342.13 684,260 12,472,691
2019-08-01 2019-07-31 4 CSGP COSTAR GROUP, INC.
Common Stock, par value $0.01 per share
M - Exercise 7,533 34,456 27.98 204.91 1,543,587 7,060,379
2019-08-01 2019-07-31 4 CSGP COSTAR GROUP, INC.
Common Stock, par value $0.01 per share
M - Exercise 3,500 26,923 14.94 182.75 639,625 4,920,178
2019-06-03 2019-06-02 4 CSGP COSTAR GROUP INC
Common Stock, par value $0.01 per share
A - Award 1 23,423 0.00
2019-04-02 2019-03-31 4 CSGP COSTAR GROUP INC
Common Stock, par value $0.01 per share
F - Taxes -1,049 23,422 -4.29 466.42 -489,275 10,924,489
2019-03-12 2019-03-11 4 CSGP COSTAR GROUP INC
Common Stock, par value $0.01 per share
F - Taxes -2,206 24,471 -8.27 459.98 -1,014,716 11,256,171
2019-03-04 2019-03-01 4 CSGP COSTAR GROUP INC
Option to Acquire Common Stock
M - Exercise -516 0 -100.00
2019-03-04 2019-03-01 4 CSGP COSTAR GROUP INC
Common Stock, par value $0.01 per share
S - Sale -4,701 26,677 -14.98 477.31 -2,243,834 12,733,199
2019-03-04 2019-03-01 4 CSGP COSTAR GROUP INC
Common Stock, par value $0.01 per share
M - Exercise 516 31,378 1.67 193.69 99,944 6,077,605
2019-03-04 2019-02-28 4 CSGP COSTAR GROUP INC
Common Stock, par value $0.01 per share
F - Taxes -372 30,862 -1.19 454.33 -169,011 14,021,532
2019-02-11 2019-02-07 4 CSGP COSTAR GROUP INC
Option to Acquire Common Stock
A - Award 3,800 3,800
2019-02-11 2019-02-07 4 CSGP COSTAR GROUP INC
Common Stock, par value $0.01 per share
A - Award 5,580 31,234 21.75
2018-09-12 2018-09-11 4 CSGP COSTAR GROUP INC
Common Stock, par value $0.01 per share
F - Taxes -1,281 25,654 -4.76 435.98 -558,490 11,184,631
2018-07-31 2018-07-30 4 CSGP COSTAR GROUP INC
Option to Acquire Common Stock
M - Exercise -2,500 3,500 -41.67
2018-07-31 2018-07-30 4 CSGP COSTAR GROUP INC
Option to Acquire Common Stock
M - Exercise -1,884 516 -78.50
2018-07-31 2018-07-30 4 CSGP COSTAR GROUP INC
Common Stock, par value $0.01 per share
S - Sale -4,384 26,935 -14.00 411.93 -1,805,901 11,095,335
2018-07-31 2018-07-30 4 CSGP COSTAR GROUP INC
Common Stock, par value $0.01 per share
M - Exercise 2,500 31,319 8.67 182.75 456,875 5,723,547
2018-07-31 2018-07-30 4 CSGP COSTAR GROUP INC
Common Stock, par value $0.01 per share
M - Exercise 1,884 28,819 6.99 193.69 364,912 5,581,952
2018-04-03 2018-03-31 4 CSGP COSTAR GROUP INC
Common Stock, par value $0.01 per share
F - Taxes -1,017 26,935 -3.64 362.68 -368,846 9,768,786
2018-03-13 2018-03-11 4 CSGP COSTAR GROUP INC
Common Stock, par value $0.01 per share
F - Taxes -738 27,952 -2.57 361.22 -266,580 10,096,821
2018-03-06 2018-03-05 4 CSGP COSTAR GROUP INC
Common Stock, par value $0.01 per share
F - Taxes -1,581 28,690 -5.22 348.28 -550,631 9,992,153
2018-03-06 2018-03-02 4 CSGP COSTAR GROUP INC
Option to Acquire Common Stock
M - Exercise -3,000 6,000 -33.33
2018-03-06 2018-03-02 4 CSGP COSTAR GROUP INC
Option to Acquire Common Stock
M - Exercise -3,768 2,400 -61.09
2018-03-06 2018-03-02 4 CSGP COSTAR GROUP INC
Common Stock, par value $0.01 per share
S - Sale -1,153 30,271 -3.67 348.45 -401,763 10,547,930
2018-03-06 2018-03-02 4 CSGP COSTAR GROUP INC
Common Stock, par value $0.01 per share
S - Sale -6,768 31,424 -17.72 348.19 -2,356,550 10,941,523
2018-03-06 2018-03-02 4 CSGP COSTAR GROUP INC
Common Stock, par value $0.01 per share
M - Exercise 3,000 38,192 8.52 182.75 548,250 6,979,588
2018-03-06 2018-03-02 4 CSGP COSTAR GROUP INC
Common Stock, par value $0.01 per share
M - Exercise 3,768 35,192 11.99 193.69 729,824 6,816,338
2018-03-01 2018-02-28 4 CSGP COSTAR GROUP INC
Option to Acquire Common Stock
A - Award 6,000 6,000
2018-03-01 2018-02-28 4 CSGP COSTAR GROUP INC
Common Stock, par value $0.01 per share
A - Award 5,020 31,424 19.01
2017-09-12 2017-09-11 4 CSGP COSTAR GROUP INC
Common Stock, par value $0.01 per share
F - Taxes -1,197 26,404 -4.34 280.40 -335,639 7,403,682
2017-08-01 2017-07-31 4 CSGP COSTAR GROUP INC
Option to Acquire Common Stock
M - Exercise -1,032 6,168 -14.33
2017-08-01 2017-07-31 4 CSGP COSTAR GROUP INC
Common Stock, par value $0.01 per share
S - Sale -1,767 27,601 -6.02 273.15 -482,656 7,539,213
2017-08-01 2017-07-31 4 CSGP COSTAR GROUP INC
Common Stock, par value $0.01 per share
M - Exercise 1,032 29,368 3.64 193.69 199,888 5,688,288
2017-05-03 2017-05-01 4 CSGP COSTAR GROUP INC
Common Stock, par value $0.01 per share
S - Sale -1,037 28,336 -3.53 240.00 -248,880 6,800,640
2017-03-14 2017-03-11 4 CSGP COSTAR GROUP INC
Common Stock, par value $0.01 per share
F - Taxes -557 29,373 -1.86 205.18 -114,285 6,026,752
2017-03-07 2017-03-05 4 CSGP COSTAR GROUP INC
Common Stock, par value $0.01 per share
F - Taxes -548 29,930 -1.80 206.13 -112,959 6,169,471
2017-03-02 2017-03-02 4 CSGP COSTAR GROUP INC
Option to Acquire Common Stock
A - Award 11,300 11,300
2017-03-02 2017-03-02 4 CSGP COSTAR GROUP INC
Common Stock, par value $0.01 per share
A - Award 10,040 30,478 49.12
2016-11-01 2016-10-31 4 CSGP COSTAR GROUP INC
Common Stock, par value $0.01 per share
S - Sale -1,060 20,438 -4.93 188.31 -199,609 3,848,680
2016-09-13 2016-09-11 4 CSGP COSTAR GROUP INC
Common Stock, par value $0.01 per share
F - Taxes -883 21,498 -3.95 205.69 -181,624 4,421,924
2016-03-15 2016-03-11 4 CSGP COSTAR GROUP INC
Option to Acquire Common Stock
A - Award 9,000 9,000
2016-03-15 2016-03-11 4 CSGP COSTAR GROUP INC
Common Stock, par value $0.01 per share
A - Award 7,380 22,381 49.20
2016-03-08 2016-03-05 4 CSGP COSTAR GROUP INC
Common Stock, par value $0.01 per share
F - Taxes -553 15,001 -3.56 183.25 -101,337 2,748,933
2015-09-15 2015-09-11 4 CSGP COSTAR GROUP INC
Common Stock, par value $0.01 per share
F - Taxes -883 15,554 -5.37 179.24 -158,269 2,787,899
2015-03-09 2015-03-05 4 CSGP COSTAR GROUP INC
Option to Acquire Common Stock
A - Award 7,200
2015-03-09 2015-03-05 4 CSGP COSTAR GROUP INC
Common Stock, par value $0.01 per share
A - Award 6,940 16,437 73.08
2014-09-15 2014-09-11 4 CSGP COSTAR GROUP INC
Common Stock, par value $0.01 per share
A - Award 9,497 9,497
2014-06-04 3 CSGP COSTAR GROUP INC
No securities are beneficially owned
0
P
Open market or private purchase of non-derivative or derivative security
S
Open market or private sale of non-derivative or derivative security
A
Grant, award, or other acquisition of securities from the company (such as an option)
C
Conversion of derivative
D
Sale or transfer of securities back to the company
F
Payment of exercise price or tax liability using portion of securities received from the company
G
Gift of securities by or to the insider
K
Equity swaps and similar hedging transactions
M
Exercise or conversion of derivative security received from the company (such as an option)
V
A transaction voluntarily reported on Form 4
J
Other (accompanied by a footnote describing the transaction)