Natural Gas Services Group, Inc.
US ˙ NYSE ˙ US63886Q1094

Introduction

This page provides a comprehensive analysis of the known insider trading history of Stephen Charles Taylor. 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 Stephen Charles Taylor has reported holdings or trades in the following companies:

Security Title Latest Reported Holdings
US:NGS / Natural Gas Services Group, Inc. Director 403,334
How to Interpret the Charts

The following charts show the stock performance of securities subsequent to each open-market, non-planned trade made by Stephen Charles Taylor. 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 Purchases NGS / Natural Gas Services Group, Inc. - Short Term Profit Analysis

In this section, we analyze the profitability of every unplanned, open-market insider purchase made in NGS / Natural Gas Services Group, Inc.. This analysis helps to understand if the insider consistently generates abnormal returns, and is worth following. This analysis is for one-year following each trade, and the results are theoretical.

The following table shows the most recent open market purchases that were not part of an automatic trading plan.

Trade Date Ticker Insider Reported
Shares
Reported
Price
Adjusted
Shares
Adjusted
Price
Cost Basis Days to
Max
Price at
Max
Max
Profit ($)
Max Return (%)
There are no known unplanned open-market trades for this insider and security combination

Adjusted Price is the split-adjusted price. Adjusted Shares is the split-adjusted shares.

NGS / Natural Gas Services Group, Inc. Insider Trades
Insider Sales NGS / Natural Gas Services Group, Inc. - Short Term Loss Analysis

In this section, we analyze the short-term loss avoidance of every unplanned, open-market insider sale made in NGS / Natural Gas Services Group, Inc.. A consistent pattern of loss avoidance may suggest that future sale transactions may predict declines in price. This analysis is for one-year following each trade, and the results are theoretical.

The following table shows the most recent open market sales that were not part of an automatic trading plan.

Trade Date Ticker Insider Reported
Shares
Reported
Price
Adjusted
Shares
Adjusted
Price
Cost Basis Days to
Min
Price at
Min
Max Loss
Avoided ($)
Max Loss
Avoided (%)
2025-05-15 NGS Taylor Stephen Charles 25,000 24.9000 25,000 24.9000 622,500 78 23.2900 -40,250 -6.47
2024-12-12 NGS Taylor Stephen Charles 10,000 27.1500 10,000 27.1500 271,500
2024-08-26 NGS Taylor Stephen Charles 3,181 22.0000 3,181 22.0000 69,982
2022-06-07 NGS Taylor Stephen Charles 3,918 15.0000 3,918 15.0000 58,770
2019-02-05 ngs Taylor Stephen Charles 2,720 17.0000 2,720 17.0000 46,240
2019-02-04 ngs Taylor Stephen Charles 12,771 17.0600 12,771 17.0600 217,873
2019-01-31 ngs Taylor Stephen Charles 18 17.0000 18 17.0000 306
2019-01-30 ngs Taylor Stephen Charles 348 17.0000 348 17.0000 5,916
2019-01-29 ngs Taylor Stephen Charles 4,905 17.0500 4,905 17.0500 83,630
2019-01-28 ngs Taylor Stephen Charles 1,110 17.0000 1,110 17.0000 18,870
2019-01-25 ngs Taylor Stephen Charles 2,994 17.1400 2,994 17.1400 51,317
2019-01-25 ngs Taylor Stephen Charles 1,980 17.1400 1,980 17.1400 33,937
2019-01-24 ngs Taylor Stephen Charles 1,205 17.0000 1,205 17.0000 20,485
2019-01-23 ngs Taylor Stephen Charles 1,846 17.2100 1,846 17.2100 31,770
2019-01-22 ngs Taylor Stephen Charles 1,200 17.4800 1,200 17.4800 20,976
2019-01-18 ngs Taylor Stephen Charles 12,444 17.8900 12,444 17.8900 222,623
2019-01-17 ngs Taylor Stephen Charles 10,311 17.5000 10,311 17.5000 180,442
2018-08-29 ngs Taylor Stephen Charles 13,776 22.0100 13,776 22.0100 303,210
2018-08-27 ngs Taylor Stephen Charles 514 22.0400 514 22.0400 11,329
2018-08-24 ngs Taylor Stephen Charles 1,500 22.4500 1,500 22.4500 33,675
2018-08-23 ngs Taylor Stephen Charles 1,306 22.5100 1,306 22.5100 29,398
2018-08-21 ngs Taylor Stephen Charles 2,704 22.0200 2,704 22.0200 59,542
2017-12-19 ngs Taylor Stephen Charles 16,212 25.1700 16,212 25.1700 408,056
2017-10-03 ngs Taylor Stephen Charles 3,874 28.5800 3,874 28.5800 110,719
2017-07-03 ngs Taylor Stephen Charles 7,157 24.9900 7,157 24.9900 178,853
2017-06-30 ngs Taylor Stephen Charles 4,843 25.0000 4,843 25.0000 121,075
2017-01-05 ngs Taylor Stephen Charles 1,700 32.0000 1,700 32.0000 54,400
2017-01-05 ngs Taylor Stephen Charles 6,188 31.9300 6,188 31.9300 197,583
2017-01-04 ngs Taylor Stephen Charles 6,052 32.0200 6,052 32.0200 193,785
2017-01-03 ngs Taylor Stephen Charles 3,895 32.0700 3,895 32.0700 124,913
2017-01-03 ngs Taylor Stephen Charles 2,079 32.7900 2,079 32.7900 68,170
2016-03-22 NGS Taylor Stephen Charles 15,000 21.3280 15,000 21.3280 319,920
2015-03-31 NGS Taylor Stephen Charles 4,000 19.2700 4,000 19.2700 77,080
2015-03-30 NGS Taylor Stephen Charles 2,115 19.0700 2,115 19.0700 40,333
2015-03-27 NGS Taylor Stephen Charles 1,000 19.0000 1,000 19.0000 19,000
2015-03-24 NGS Taylor Stephen Charles 2,309 20.0600 2,309 20.0600 46,319
2015-03-20 NGS Taylor Stephen Charles 5,000 19.5300 5,000 19.5300 97,650
2015-03-18 NGS Taylor Stephen Charles 28,256 18.3300 28,256 18.3300 517,932

Adjusted Price is the split-adjusted price. Adjusted Shares is the split-adjusted shares.

NGS / Natural Gas Services Group, Inc. Insider Trades
Insider Trading History

This table shows the complete list of insider trades made by Stephen Charles Taylor 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
2025-09-04 2025-09-04 4 NGS NATURAL GAS SERVICES GROUP INC
Common Stock
S - Sale X -10,000 403,334 -2.42 27.00 -270,018 10,890,744
2025-08-25 2025-08-08 4 NGS NATURAL GAS SERVICES GROUP INC
Common Stock
A - Award 459 114,213 0.40 24.78 11,374 2,830,198
2025-08-22 2025-08-22 4 NGS NATURAL GAS SERVICES GROUP INC
Common Stock
S - Sale X -10,000 413,334 -2.36 26.00 -260,035 10,748,131
2025-08-22 2025-08-22 4 NGS NATURAL GAS SERVICES GROUP INC
Common Stock
S - Sale X -10,000 423,334 -2.31 26.50 -265,025 11,219,409
2025-05-16 2025-05-15 4 NGS NATURAL GAS SERVICES GROUP INC
Common Stock
S - Sale -25,000 433,334 -5.45 24.90 -622,500 10,790,017
2025-01-22 2025-01-21 4 NGS NATURAL GAS SERVICES GROUP INC
Common Stock
S - Sale X -10,000 438,387 -2.23 29.01 -290,100 12,717,607
2025-01-22 2025-01-21 4 NGS NATURAL GAS SERVICES GROUP INC
Common Stock
S - Sale X -9,400 448,387 -2.05 28.57 -268,549 12,809,968
2024-12-16 2024-12-12 4 NGS NATURAL GAS SERVICES GROUP INC
Common Stock
S - Sale -10,000 457,787 -2.14 27.15 -271,500 12,428,917
2024-11-26 2024-11-25 4 NGS NATURAL GAS SERVICES GROUP INC
Common Stock
S - Sale X -600 467,787 -0.13 28.50 -17,100 13,331,930
2024-11-26 2024-11-22 4 NGS NATURAL GAS SERVICES GROUP INC
Common Stock
S - Sale X -10,000 468,387 -2.09 28.00 -280,000 13,114,836
2024-11-21 2024-11-21 4 NGS NATURAL GAS SERVICES GROUP INC
Common Stock
S - Sale X -38,479 478,387 -7.44 26.89 -1,034,777 12,864,783
2024-11-21 2024-11-20 4 NGS NATURAL GAS SERVICES GROUP INC
Common Stock
S - Sale X -1,521 516,866 -0.29 26.00 -39,546 13,438,516
2024-11-21 2024-11-19 4 NGS NATURAL GAS SERVICES GROUP INC
Common Stock
S - Sale X -6,516 518,387 -1.24 25.50 -166,158 13,218,868
2024-11-18 2024-11-18 4 NGS NATURAL GAS SERVICES GROUP INC
Common Stock
S - Sale X -3,442 524,903 -0.65 25.51 -87,809 13,390,800
2024-11-18 2024-11-15 4 NGS NATURAL GAS SERVICES GROUP INC
Common Stock
S - Sale X -10,042 528,345 -1.87 25.01 -251,110 13,211,795
2024-11-13 2024-11-13 4 NGS NATURAL GAS SERVICES GROUP INC
Common Stock
S - Sale X -2,191 538,387 -0.41 24.50 -53,680 13,190,482
2024-11-13 2024-11-12 4 NGS NATURAL GAS SERVICES GROUP INC
Common Stock
S - Sale X -4,713 540,578 -0.86 24.51 -115,506 13,248,486
2024-11-13 2024-11-11 4 NGS NATURAL GAS SERVICES GROUP INC
Common Stock
S - Sale X -3,096 545,291 -0.56 24.50 -75,853 13,359,793
2024-11-13 2024-08-20 4/A NGS NATURAL GAS SERVICES GROUP INC
Common Stock
S - Sale X -4,690 551,568 -0.84 22.14 -103,837 12,211,716
2024-08-28 2024-08-26 4 NGS NATURAL GAS SERVICES GROUP INC
Common Stock
S - Sale -3,181 548,387 -0.58 22.00 -69,982 12,064,514
2024-08-22 2024-08-20 4 NGS NATURAL GAS SERVICES GROUP INC
Common Stock
S - Sale -4,690 551,568 -0.84 22.14 -103,837 12,211,716
2024-07-01 2024-06-30 4 NGS NATURAL GAS SERVICES GROUP INC
Common Stock
F - Taxes -3,975 556,258 -0.71 20.12 -79,977 11,191,911
2024-07-01 2024-06-30 4 NGS NATURAL GAS SERVICES GROUP INC
Common Stock
A - Award 10,101 560,233 1.84
2023-07-05 2023-06-30 4 NGS NATURAL GAS SERVICES GROUP INC
Common Stock
F - Taxes -42,240 550,132 -7.13 9.90 -418,176 5,446,307
2023-07-05 2023-06-30 4 NGS NATURAL GAS SERVICES GROUP INC
Common Stock
A - Award 10,101 592,372 1.73 9.90 100,000 5,864,483
2023-05-15 2023-04-25 4/A NGS NATURAL GAS SERVICES GROUP INC
Common Stock
F - Taxes -23,134 582,271 -3.82 10.41 -240,825 6,061,441
2023-05-03 2023-04-28 4/A NGS NATURAL GAS SERVICES GROUP INC
Common Stock
A - Award 3,138 133,701 2.40
2023-05-03 2023-04-28 4/A NGS NATURAL GAS SERVICES GROUP INC
Common Stock
F - Taxes -11,158 605,405 -1.81 10.30 -114,927 6,235,672
2023-05-02 2023-04-28 4 NGS NATURAL GAS SERVICES GROUP INC
Common Stock
F - Taxes -11,158 605,405 -1.81 10.30 -114,927 6,235,672
2023-04-27 2023-04-25 4 NGS NATURAL GAS SERVICES GROUP INC
Common Stock
A - Award 58,790 616,563 10.54 10.41 612,004 6,418,421
2023-03-22 2023-03-20 4 NGS NATURAL GAS SERVICES GROUP INC
Common Stock
F - Taxes -14,325 557,773 -2.50 9.49 -135,944 5,293,266
2022-08-16 2022-08-15 4 NGS NATURAL GAS SERVICES GROUP INC
Common Stock
A - Award 60,839 572,098 11.90
2022-06-08 2022-06-07 4 NGS NATURAL GAS SERVICES GROUP INC
Common Stock
S - Sale -3,918 511,259 -0.76 15.00 -58,770 7,668,885
2022-05-02 2022-04-28 4 NGS NATURAL GAS SERVICES GROUP INC
Restricted Stock Units
M - Exercise -3,137 3,138 -49.99
2022-05-02 2022-04-28 4 NGS NATURAL GAS SERVICES GROUP INC
Common Stock
M - Exercise 3,137 130,563 2.46
2022-05-02 2022-04-28 4 NGS NATURAL GAS SERVICES GROUP INC
Common Stock
F - Taxes -11,112 515,177 -2.11 12.32 -136,900 6,346,981
2022-03-31 2022-03-29 4 NGS NATURAL GAS SERVICES GROUP INC
Restricted Stock Units
M - Exercise -10,973 6,275 -63.62
2022-03-31 2022-03-29 4 NGS NATURAL GAS SERVICES GROUP INC
Common Stock
M - Exercise 10,973 127,426 9.42
2022-03-31 2022-03-29 4 NGS NATURAL GAS SERVICES GROUP INC
Common Stock
F - Taxes -12,953 526,289 -2.40 11.86 -153,623 6,241,788
2022-03-22 2022-03-18 4 NGS NATURAL GAS SERVICES GROUP INC
Common Stock
F - Taxes -14,311 539,242 -2.59 11.14 -159,425 6,007,156
2021-04-30 2021-04-28 4 ngs NATURAL GAS SERVICES GROUP INC
Restricted Stock Units
M - Exercise -3,138 17,248 -15.39
2021-04-30 2021-04-28 4 ngs NATURAL GAS SERVICES GROUP INC
Common Stock
M - Exercise 3,138 116,453 2.77
2021-04-30 2021-04-28 4 ngs NATURAL GAS SERVICES GROUP INC
Common Stock
F - Taxes -11,112 553,553 -1.97 9.12 -101,341 5,048,403
2021-04-02 2021-03-18 4/A NGS NATURAL GAS SERVICES GROUP INC
Common Stock
A - Award 109,212 577,619 23.32 8.91 973,079 5,146,585
2021-03-31 2021-03-29 4 NGS NATURAL GAS SERVICES GROUP INC
Restricted Stock Units
M - Exercise -10,973 20,386 -34.99
2021-03-31 2021-03-29 4 NGS NATURAL GAS SERVICES GROUP INC
Common Stock
F - Taxes -12,954 556,079 -2.28 9.19 -119,047 5,110,366
2021-03-31 2021-03-29 4 NGS NATURAL GAS SERVICES GROUP INC
Common Stock
M - Exercise 10,973 113,315 10.72
2021-03-22 2021-03-18 4 ngs NATURAL GAS SERVICES GROUP INC
Common Stock
A - Award 100,626 569,033 21.48 8.91 896,578 5,070,084
2021-03-17 2021-03-15 4 NGS NATURAL GAS SERVICES GROUP INC
Restricted Stock Units
M - Exercise -9,317 31,359 -22.91
2021-03-17 2021-03-15 4 NGS NATURAL GAS SERVICES GROUP INC
Common Stock
F - Taxes -7,620 468,407 -1.60 9.74 -74,219 4,562,284
2021-03-17 2021-03-15 4 NGS NATURAL GAS SERVICES GROUP INC
Common Stock
M - Exercise 9,317 102,342 10.02
2020-04-30 2020-04-28 4 NGS NATURAL GAS SERVICES GROUP INC
Restricted Stock Units
A - Award 9,413 40,676 30.11
2020-04-30 2020-04-28 4 NGS NATURAL GAS SERVICES GROUP INC
Common Stock
A - Award 84,720 476,027 21.65 5.64 477,821 2,684,792
2020-03-31 2020-03-29 4 ngs NATURAL GAS SERVICES GROUP INC
Restricted Stock Units
M - Exercise -10,973 31,263 -25.98
2020-03-31 2020-03-29 4 ngs NATURAL GAS SERVICES GROUP INC
Common Stock
F - Taxes -13,211 391,307 -3.27 4.75 -62,752 1,858,708
2020-03-31 2020-03-29 4 ngs NATURAL GAS SERVICES GROUP INC
Common Stock
M - Exercise 10,973 93,025 13.37
2020-03-18 2020-03-15 4 NGS NATURAL GAS SERVICES GROUP INC
Restricted Stock Units
M - Exercise -9,317 42,236 -18.07
2020-03-18 2020-03-15 4 NGS NATURAL GAS SERVICES GROUP INC
Common Stock
F - Taxes -7,663 404,248 -1.86 6.25 -47,894 2,526,550
2020-03-18 2020-03-15 4 NGS NATURAL GAS SERVICES GROUP INC
Common Stock
M - Exercise 9,317 82,052 12.81
2020-02-19 2020-02-14 4 NGS NATURAL GAS SERVICES GROUP INC
Restricted Stock Units
M - Exercise -21,139 51,553 -29.08
2020-02-19 2020-02-14 4 NGS NATURAL GAS SERVICES GROUP INC
Common Stock
F - Taxes -1,477 411,911 -0.36 10.62 -15,686 4,374,495
2020-02-19 2020-02-14 4 NGS NATURAL GAS SERVICES GROUP INC
Common Stock
M - Exercise 21,139 72,735 40.97
2019-07-01 2019-06-28 4 ngs NATURAL GAS SERVICES GROUP INC
Restricted Stock Units
A - Award 32,919 72,692 82.77
2019-07-01 2019-06-28 4 ngs NATURAL GAS SERVICES GROUP INC
Common Stock
A - Award 98,755 413,388 31.39 17.29 1,707,474 7,147,479
2019-03-19 2019-03-15 4 ngs NATURAL GAS SERVICES GROUP INC
Restricted Stock Units
M - Exercise -9,317 39,773 -18.98
2019-03-19 2019-03-15 4 ngs NATURAL GAS SERVICES GROUP INC
Common Stock
F - Taxes -5,309 314,076 -1.66 18.07 -95,934 5,675,353
2019-03-19 2019-03-15 4 ngs NATURAL GAS SERVICES GROUP INC
Common Stock
M - Exercise 9,317 51,596 22.04
2019-02-28 2019-02-14 4 ngs NATURAL GAS SERVICES GROUP INC
Restricted Stock Units
M - Exercise -21,140 49,090 -30.10
2019-02-28 2019-02-14 4 ngs NATURAL GAS SERVICES GROUP INC
Common Stock
F - Taxes -1,277 319,385 -0.40 18.04 -23,037 5,761,705
2019-02-28 2019-02-14 4 ngs NATURAL GAS SERVICES GROUP INC
Common Stock
M - Exercise 21,140 42,279 100.00
2019-02-06 2019-02-05 4 ngs NATURAL GAS SERVICES GROUP INC
Employee Stock Option
M - Exercise -2,720 0 -100.00
2019-02-06 2019-02-05 4 ngs NATURAL GAS SERVICES GROUP INC
Common Stock
S - Sale -2,720 320,662 -0.84 17.00 -46,240 5,451,254
2019-02-06 2019-02-05 4 ngs NATURAL GAS SERVICES GROUP INC
Common Stock
M - Exercise 2,720 323,382 0.85 7.84 21,325 2,535,315
2019-02-04 2019-02-04 4 ngs NATURAL GAS SERVICES GROUP INC
Employee Stock Option
M - Exercise -12,771 2,720 -82.44
2019-02-04 2019-02-04 4 ngs NATURAL GAS SERVICES GROUP INC
Common Stock
S - Sale -12,771 320,662 -3.83 17.06 -217,873 5,470,494
2019-02-04 2019-02-04 4 ngs NATURAL GAS SERVICES GROUP INC
Common Stock
M - Exercise 12,771 333,433 3.98 7.84 100,125 2,614,115
2019-02-04 2019-01-31 4 ngs NATURAL GAS SERVICES GROUP INC
Employee Stock Option
M - Exercise -18 15,491 -0.12
2019-02-04 2019-01-31 4 ngs NATURAL GAS SERVICES GROUP INC
Common Stock
S - Sale -18 320,662 -0.01 17.00 -306 5,451,254
2019-02-04 2019-01-31 4 ngs NATURAL GAS SERVICES GROUP INC
Common Stock
M - Exercise 18 320,680 0.01 7.84 141 2,514,131
2019-01-30 2019-01-30 4 ngs NATURAL GAS SERVICES GROUP INC
Employee Stock Option
M - Exercise -348 15,509 -2.19
2019-01-30 2019-01-30 4 ngs NATURAL GAS SERVICES GROUP INC
Common Stock
S - Sale -348 320,662 -0.11 17.00 -5,916 5,451,254
2019-01-30 2019-01-30 4 ngs NATURAL GAS SERVICES GROUP INC
Common Stock
M - Exercise 348 321,010 0.11 7.84 2,728 2,516,718
2019-01-30 2019-01-29 4 ngs NATURAL GAS SERVICES GROUP INC
Employee Stock Option
M - Exercise -4,905 15,857 -23.62
2019-01-30 2019-01-29 4 ngs NATURAL GAS SERVICES GROUP INC
Common Stock
S - Sale -4,905 320,662 -1.51 17.05 -83,630 5,467,287
2019-01-30 2019-01-29 4 ngs NATURAL GAS SERVICES GROUP INC
Common Stock
M - Exercise 4,905 325,567 1.53 7.84 38,455 2,552,445
2019-01-30 2019-01-28 4 ngs NATURAL GAS SERVICES GROUP INC
Employee Stock Option
M - Exercise -1,110 20,762 -5.07
2019-01-30 2019-01-28 4 ngs NATURAL GAS SERVICES GROUP INC
Common Stock
S - Sale -1,110 320,662 -0.34 17.00 -18,870 5,451,254
2019-01-30 2019-01-28 4 ngs NATURAL GAS SERVICES GROUP INC
Common Stock
M - Exercise 1,110 321,772 0.35 7.84 8,702 2,522,692
2019-01-25 2019-01-25 4 ngs NATURAL GAS SERVICES GROUP INC
Employee Stock Option
M - Exercise -1,980 21,872 -8.30
2019-01-25 2019-01-25 4 ngs NATURAL GAS SERVICES GROUP INC
Employee Stock Option
M - Exercise -2,994 0 -100.00
2019-01-25 2019-01-25 4 ngs NATURAL GAS SERVICES GROUP INC
Common Stock
S - Sale -1,980 320,662 -0.61 17.14 -33,937 5,496,147
2019-01-25 2019-01-25 4 ngs NATURAL GAS SERVICES GROUP INC
Common Stock
M - Exercise 1,980 322,642 0.62 7.84 15,523 2,529,513
2019-01-25 2019-01-25 4 ngs NATURAL GAS SERVICES GROUP INC
Common Stock
S - Sale -2,994 320,662 -0.93 17.14 -51,317 5,496,147
2019-01-25 2019-01-25 4 ngs NATURAL GAS SERVICES GROUP INC
Common Stock
M - Exercise 2,994 323,656 0.93 9.95 29,790 3,220,377
2019-01-25 2019-01-24 4 ngs NATURAL GAS SERVICES GROUP INC
Employee Stock Option
M - Exercise -1,205 2,994 -28.70
2019-01-25 2019-01-24 4 ngs NATURAL GAS SERVICES GROUP INC
Common Stock
S - Sale -1,205 320,662 -0.37 17.00 -20,485 5,451,254
2019-01-25 2019-01-24 4 ngs NATURAL GAS SERVICES GROUP INC
Common Stock
M - Exercise 1,205 321,867 0.38 9.95 11,990 3,202,577
2019-01-25 2019-01-23 4 ngs NATURAL GAS SERVICES GROUP INC
Employee Stock Option
M - Exercise -1,846 4,199 -30.54
2019-01-25 2019-01-23 4 ngs NATURAL GAS SERVICES GROUP INC
Common Stock
S - Sale -1,846 320,662 -0.57 17.21 -31,770 5,518,593
2019-01-25 2019-01-23 4 ngs NATURAL GAS SERVICES GROUP INC
Common Stock
M - Exercise 1,846 322,508 0.58 9.95 18,368 3,208,955
2019-01-22 2019-01-22 4 ngs NATURAL GAS SERVICES GROUP INC
Common Stock
M - Exercise -1,200 6,045 -16.56
2019-01-22 2019-01-22 4 ngs NATURAL GAS SERVICES GROUP INC
Common Stock
S - Sale -1,200 320,662 -0.37 17.48 -20,976 5,605,172
2019-01-22 2019-01-22 4 ngs NATURAL GAS SERVICES GROUP INC
Common Stock
M - Exercise 1,200 321,862 0.37 9.95 11,940 3,202,527
2019-01-22 2019-01-18 4 ngs NATURAL GAS SERVICES GROUP INC
Employee Stock Option
M - Exercise -12,444 7,245 -63.20
2019-01-22 2019-01-18 4 ngs NATURAL GAS SERVICES GROUP INC
Common Stock
S - Sale -12,444 320,662 -3.74 17.89 -222,623 5,736,643
2019-01-22 2019-01-18 4 ngs NATURAL GAS SERVICES GROUP INC
Common Stock
M - Exercise 12,444 333,106 3.88 9.95 123,818 3,314,405
2019-01-22 2019-01-17 4 ngs NATURAL GAS SERVICES GROUP INC
Employee Stock Option
M - Exercise -10,311 19,689 -34.37
2019-01-22 2019-01-17 4 ngs NATURAL GAS SERVICES GROUP INC
Common Stock
S - Sale -10,311 320,662 -3.12 17.50 -180,442 5,611,585
2019-01-22 2019-01-17 4 ngs NATURAL GAS SERVICES GROUP INC
Common Stock
M - Exercise 10,311 330,973 3.22 9.95 102,594 3,293,181
2018-09-06 2018-09-06 4 ngs NATURAL GAS SERVICES GROUP INC
Employee Stock Option
M - Exercise -5,000 0 -100.00
2018-09-06 2018-09-06 4 ngs NATURAL GAS SERVICES GROUP INC
Common Stock
M - Exercise 4,000 320,662 1.26 17.51 70,040 5,614,792
2018-08-31 2018-08-29 4 ngs NATURAL GAS SERVICES GROUP INC
Employee Stock Option
M - Exercise -13,776 4,000 -77.50
2018-08-31 2018-08-29 4 ngs NATURAL GAS SERVICES GROUP INC
Common Stock
S - Sale -13,776 316,662 -4.17 22.01 -303,210 6,969,731
2018-08-31 2018-08-29 4 ngs NATURAL GAS SERVICES GROUP INC
Common Stock
M - Exercise 13,776 330,438 4.35 17.51 241,218 5,785,969
2018-08-27 2018-08-27 4 ngs NATURAL GAS SERVICES GROUP INC
Common Stock
S - Sale -514 316,662 -0.16 22.04 -11,329 6,979,230
2018-08-27 2018-08-24 4 ngs NATURAL GAS SERVICES GROUP INC
Common Stock
S - Sale -1,500 317,176 -0.47 22.45 -33,675 7,120,601
2018-08-27 2018-08-23 4 ngs NATURAL GAS SERVICES GROUP INC
Common Stock
S - Sale -1,306 318,676 -0.41 22.51 -29,398 7,173,397
2018-08-27 2018-08-23 4 ngs NATURAL GAS SERVICES GROUP INC
Common Stock
M - Exercise 3,320 319,982 1.05 17.51 58,133 5,602,885
2018-08-27 2018-03-23 4 ngs NATURAL GAS SERVICES GROUP INC
Employee Stock Option
M - Exercise -3,320 17,776 -15.74
2018-08-23 2018-08-21 4 ngs NATURAL GAS SERVICES GROUP INC
Employee Stock Option
M - Exercise -3,904 21,096 -15.62
2018-08-23 2018-08-21 4 ngs NATURAL GAS SERVICES GROUP INC
Common Stock
S - Sale -2,704 316,662 -0.85 22.02 -59,542 6,972,897
2018-08-23 2018-08-21 4 ngs NATURAL GAS SERVICES GROUP INC
Common Stock
F - Taxes -1,200 319,366 -0.37 22.02 -26,424 7,032,439
2018-08-23 2018-08-21 4 ngs NATURAL GAS SERVICES GROUP INC
Common Stock
M - Exercise 3,904 320,566 1.23 17.51 68,359 5,613,111
2018-03-19 2018-03-15 4 ngs NATURAL GAS SERVICES GROUP INC
Restricted Stock Units
A - Award 27,951 27,951
2018-03-19 2018-03-15 4 ngs NATURAL GAS SERVICES GROUP INC
Common Stock
A - Award 56,749 316,662 21.83 24.55 1,393,188 7,774,052
2018-02-16 2018-02-14 4 ngs NATURAL GAS SERVICES GROUP INC
Restricted Stock Units
M - Exercise -21,139 42,279 -33.33
2018-02-16 2018-02-14 4 ngs NATURAL GAS SERVICES GROUP INC
Common Stock
F - Taxes -1,278 259,913 -0.49 26.30 -33,611 6,835,712
2018-02-16 2018-02-14 4 ngs NATURAL GAS SERVICES GROUP INC
Common Stock
M - Exercise 21,139 21,139
2018-01-12 2018-01-06 4 ngs NATURAL GAS SERVICES GROUP INC
Common Stock
F - Taxes -15,897 261,191 -5.74 27.40 -435,578 7,156,633
2017-12-20 2017-12-19 4 ngs NATURAL GAS SERVICES GROUP INC
Employee Stock Option
M - Exercise -16,212 0 -100.00
2017-12-20 2017-12-19 4 ngs NATURAL GAS SERVICES GROUP INC
Common Stock
S - Sale -16,212 277,088 -5.53 25.17 -408,056 6,974,305
2017-12-20 2017-12-19 4 ngs NATURAL GAS SERVICES GROUP INC
Common Stock
A - Award 16,212 293,300 5.85 20.06 325,213 5,883,598
2017-10-04 2017-10-03 4 ngs NATURAL GAS SERVICES GROUP INC
Employee Stock Option
M - Exercise -3,874 16,212 -19.29
2017-10-04 2017-10-03 4 ngs NATURAL GAS SERVICES GROUP INC
Common Stock
S - Sale -3,874 277,088 -1.38 28.58 -110,719 7,919,175
2017-10-04 2017-10-03 4 ngs NATURAL GAS SERVICES GROUP INC
Common Stock
A - Award 3,874 280,962 1.40 20.06 77,712 5,636,098
2017-07-05 2017-07-03 4 ngs NATURAL GAS SERVICES GROUP INC
Common Stock
S - Sale -7,157 277,088 -2.52 24.99 -178,853 6,924,429
2017-07-05 2017-06-30 4 ngs NATURAL GAS SERVICES GROUP INC
Common Stock
S - Sale -4,843 284,245 -1.68 25.00 -121,075 7,106,125
2017-04-28 2017-01-06 4 ngs NATURAL GAS SERVICES GROUP INC
Common Stock
F - Taxes -15,696 289,088 -5.15 31.35 -492,070 9,062,909
2017-03-16 2017-01-06 4 ngs NATURAL GAS SERVICES GROUP INC
Common Stock
F - Taxes -15,696 334,890 -4.48 31.35 -492,070 10,498,802
2017-03-15 2017-02-14 4/A ngs NATURAL GAS SERVICES GROUP INC
Restricted Stock Units
A - Award 17,616 17,616
2017-03-15 2017-02-14 4/A ngs NATURAL GAS SERVICES GROUP INC
Common Stock
A - Award 52,848 350,586 17.75 28.65 1,514,095 10,044,289
2017-02-15 2017-02-14 4 ngs NATURAL GAS SERVICES GROUP INC
Common Stock
A - Award 70,464 368,202 23.67 28.65 2,018,794 10,548,987
2017-01-12 2017-01-11 4 ngs NATURAL GAS SERVICES GROUP INC
Employee Stock Option
M - Exercise -19,914 20,086 -49.78
2017-01-12 2017-01-11 4 ngs NATURAL GAS SERVICES GROUP INC
Common Stock
M - Exercise 19,914 297,738 7.17 20.06 399,475 5,972,624
2017-01-05 2017-01-05 4 ngs NATURAL GAS SERVICES GROUP INC
Common Stock
S - Sale -6,188 277,824 -2.18 31.93 -197,583 8,870,920
2017-01-05 2017-01-05 4 ngs NATURAL GAS SERVICES GROUP INC
Common Stock
S - Sale -1,700 284,012 -0.60 32.00 -54,400 9,088,384
2017-01-05 2017-01-04 4 ngs NATURAL GAS SERVICES GROUP INC
Common Stock
S - Sale -6,052 285,712 -2.07 32.02 -193,785 9,148,498
2017-01-05 2017-01-03 4 ngs NATURAL GAS SERVICES GROUP INC
Common Stock
S - Sale -2,079 291,764 -0.71 32.79 -68,170 9,566,942
2017-01-05 2017-01-03 4 ngs NATURAL GAS SERVICES GROUP INC
Common Stock
S - Sale -3,895 293,843 -1.31 32.07 -124,913 9,423,545
2016-05-12 2016-01-18 4 ngs NATURAL GAS SERVICES GROUP INC
Common Stock
F - Taxes -34,805 297,738 -10.47 18.46 -642,500 5,496,243
2016-03-24 2016-03-22 4 NGS NATURAL GAS SERVICES GROUP INC
Nonstatutory Stock Option (right to buy)
M - Exercise -15,000 0 -100.00
2016-03-24 2016-03-22 4 NGS NATURAL GAS SERVICES GROUP INC
Common Stock
S - Sale -15,000 332,543 -4.32 21.33 -319,920 7,092,477
2016-03-24 2016-03-22 4 NGS NATURAL GAS SERVICES GROUP INC
Common Stock
M - Exercise 15,000 347,543 4.51 14.22 213,300 4,942,061
2016-02-09 2016-01-06 4/A NGS NATURAL GAS SERVICES GROUP INC
Common Stock
A - Award 75,915 332,543 29.58 22.13 1,679,999 7,359,177
2016-01-08 2016-01-06 4 NGS NATURAL GAS SERVICES GROUP INC
Common Stock
A - Award 75,915 332,543 29.58 22.13 1,679,999 7,359,177
2015-06-12 2015-01-23 4 NGS NATURAL GAS SERVICES GROUP INC
Common Stock
F - Taxes -20,547 244,884 -7.74 22.00 -452,034 5,387,448
2015-04-02 2015-03-30 4 NGS NATURAL GAS SERVICES GROUP INC
Common Stock
S - Sale -2,115 265,431 -0.79 19.07 -40,333 5,061,769
2015-04-01 2015-03-31 4 NGS NATURAL GAS SERVICES GROUP INC
Common Stock
S - Sale -4,000 267,546 -1.47 19.27 -77,080 5,155,611
2015-03-30 2015-03-27 4 NGS NATURAL GAS SERVICES GROUP INC
Common Stock
S - Sale -1,000 271,546 -0.37 19.00 -19,000 5,159,374
2015-03-26 2015-03-24 4 NGS NATURAL GAS SERVICES GROUP INC
Common Stock
S - Sale -2,309 272,546 -0.84 20.06 -46,319 5,467,273
2015-03-20 2015-03-20 4 NGS NATURAL GAS SERVICES GROUP INC
Common Stock
S - Sale -5,000 286,599 -1.71 19.53 -97,650 5,597,278
2015-03-20 2015-03-18 4 NGS NATURAL GAS SERVICES GROUP INC
Nonstatutory Stock Option (right to buy)
M - Exercise -45,000 0 -100.00
2015-03-20 2015-03-18 4 NGS NATURAL GAS SERVICES GROUP INC
Common Stock
S - Sale -28,256 291,599 -8.83 18.33 -517,932 5,345,010
2015-03-20 2015-03-18 4 NGS NATURAL GAS SERVICES GROUP INC
Common Stock
M - Exercise 45,000 319,855 16.37 9.22 414,900 2,949,063
2015-01-20 2015-01-16 4 NGS NATURAL GAS SERVICES GROUP INC
Common Stock
A - Award 83,590 274,855 43.70 19.49 1,629,169 5,356,924
2014-01-27 2014-01-23 4 NGS NATURAL GAS SERVICES GROUP INC
Common Stock
A - Award 49,420 191,265 34.84 28.11 1,389,196 5,376,459
2013-05-02 2013-02-21 4 NGS NATURAL GAS SERVICES GROUP INC
Common Stock
A - Award 56,950 141,845 67.08 20.19 1,149,820 2,863,851
2012-01-27 2012-01-25 4 NGS NATURAL GAS SERVICES GROUP INC
Common Stock
A - Award 50,000 84,895 143.29 14.89 744,500 1,264,087
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)