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Natural Gas Services Group Inc

NGS
Exchange
NYSE
Industry
Oil & Gas Field Services, NEC
SEC CIK
0001084991

In the last 90 days, Natural Gas Services Group Inc insiders filed 1 open-market purchase and 0 sales; 161 institutions reported holding it in 13F filings for Q2 2026, worth $475.2M in total; no superinvestor holds it.

Four kinds of short-selling data, each measuring something different:

  • Short interest: shares sold short and not yet bought back, as of a settlement date. FINRA publishes it twice a month, about eight business days after the settlement date.
  • Daily short volume: shares sold short each day in off-exchange trades reported to FINRA. It counts trades, not open positions, and is published the next day.
  • Fails-to-deliver: shares not delivered by the settlement date. The SEC publishes them twice a month, about two weeks late.
  • ATS (dark pool) volume: weekly volume on alternative trading systems and other off-exchange venues. FINRA publishes it two to four weeks after the week.

More in the glossary.

Short interest

Shares sold short and not yet bought back, from FINRA, on every settlement date in the last two years.

Short interest
510.6K
Shares, settlement Oct 30, 2026
Change
+25.7K
+5.3% vs. Oct 15, 2026
Days to cover
6.37
Short interest ÷ average daily volume
Average daily volume
80.1K
Shares, as reported by FINRA
Short interest by settlement date
Oct 31, 2024: 126,481 sharesNov 15, 2024: 132,223 sharesNov 29, 2024: 128,162 sharesDec 13, 2024: 130,938 sharesDec 31, 2024: 200,279 sharesJan 15, 2025: 240,181 sharesJan 31, 2025: 251,518 sharesFeb 14, 2025: 285,500 sharesFeb 28, 2025: 159,065 sharesMar 14, 2025: 117,854 sharesMar 31, 2025: 134,496 sharesApr 15, 2025: 185,832 sharesApr 30, 2025: 187,631 sharesMay 15, 2025: 208,752 sharesMay 30, 2025: 239,858 sharesJun 13, 2025: 234,372 sharesJun 30, 2025: 295,598 sharesJul 15, 2025: 246,923 sharesJul 31, 2025: 226,177 sharesAug 15, 2025: 252,496 sharesAug 29, 2025: 248,315 sharesSep 15, 2025: 266,924 sharesSep 30, 2025: 309,363 sharesOct 15, 2025: 255,912 sharesOct 31, 2025: 247,256 sharesNov 14, 2025: 311,321 sharesNov 28, 2025: 258,149 sharesDec 15, 2025: 297,065 sharesDec 31, 2025: 254,311 sharesJan 15, 2026: 226,935 sharesJan 30, 2026: 201,267 sharesFeb 13, 2026: 252,463 sharesFeb 27, 2026: 245,138 sharesMar 13, 2026: 244,257 sharesMar 31, 2026: 250,160 sharesApr 15, 2026: 272,665 sharesApr 30, 2026: 240,841 sharesMay 15, 2026: 276,369 sharesMay 29, 2026: 301,889 sharesJun 15, 2026: 309,308 sharesJun 30, 2026: 447,591 sharesJul 15, 2026: 423,170 sharesJul 31, 2026: 425,353 sharesAug 14, 2026: 426,168 sharesAug 31, 2026: 448,223 sharesSep 15, 2026: 472,974 sharesSep 30, 2026: 462,586 sharesOct 15, 2026: 484,935 sharesOct 30, 2026: 510,638 shares
Short interest in NGS by settlement date
Settlement dateShort interestChangeChange %Avg. daily volumeDays to cover
Oct 30, 2026510.6K+25.7K+5.3%80.1K6.37
Oct 15, 2026484.9K+22.3K+4.8%91.2K5.32
Sep 30, 2026462.6K−10.4K−2.2%115.9K3.99
Sep 15, 2026473.0K+24.8K+5.5%122.4K3.86
Aug 31, 2026448.2K+22.1K+5.2%126.3K3.55
Aug 14, 2026426.2K+815+0.2%115.4K3.69
Jul 31, 2026425.4K+2.18K+0.5%133.6K3.18
Jul 15, 2026423.2K−24.4K−5.5%119.2K3.55
Jun 30, 2026447.6K+138.3K+44.7%192.6K2.32
Jun 15, 2026309.3K+7.42K+2.5%102.5K3.02
May 29, 2026301.9K+25.5K+9.2%119.5K2.53
May 15, 2026276.4K+35.5K+14.8%101.9K2.71
Apr 30, 2026240.8K−31.8K−11.7%88.9K2.71
Apr 15, 2026272.7K+22.5K+9.0%77.2K3.53
Mar 31, 2026250.2K+5.90K+2.4%141.6K1.77
Mar 13, 2026244.3K−881−0.4%120.9K2.02
Feb 27, 2026245.1K−7.33K−2.9%77.2K3.18
Feb 13, 2026252.5K+51.2K+25.4%126.6K1.99
Jan 30, 2026201.3K−25.7K−11.3%204.5K1.00
Jan 15, 2026226.9K−27.4K−10.8%148.7K1.53
Dec 31, 2025254.3K−42.8K−14.4%87.1K2.92
Dec 15, 2025297.1K+38.9K+15.1%96.4K3.08
Nov 28, 2025258.1K−53.2K−17.1%104.2K2.48
Nov 14, 2025311.3K+64.1K+25.9%77.0K4.04
Oct 31, 2025247.3K−8.66K−3.4%45.2K5.47
Oct 15, 2025255.9K−53.5K−17.3%47.9K5.35
Sep 30, 2025309.4K+42.4K+15.9%77.7K3.98
Sep 15, 2025266.9K+18.6K+7.5%49.4K5.40
Aug 29, 2025248.3K−4.18K−1.7%51.7K4.81
Aug 15, 2025252.5K+26.3K+11.6%69.1K3.65
Jul 31, 2025226.2K−20.7K−8.4%47.7K4.74
Jul 15, 2025246.9K−48.7K−16.5%52.4K4.71
Jun 30, 2025295.6K+61.2K+26.1%98.0K3.02
Jun 13, 2025234.4K−5.49K−2.3%77.7K3.02
May 30, 2025239.9K+31.1K+14.9%65.5K3.66
May 15, 2025208.8K+21.1K+11.3%77.6K2.69
Apr 30, 2025187.6K+1.80K+1.0%68.7K2.73
Apr 15, 2025185.8K+51.3K+38.2%96.6K1.92
Mar 31, 2025134.5K+16.6K+14.1%91.3K1.47
Mar 14, 2025117.9K−41.2K−25.9%78.8K1.50
Feb 28, 2025159.1K−126.4K−44.3%54.8K2.90
Feb 14, 2025285.5K+34.0K+13.5%53.0K5.39
Jan 31, 2025251.5K+11.3K+4.7%126.8K1.98
Jan 15, 2025240.2K+39.9K+19.9%75.3K3.19
Dec 31, 2024200.3K+69.3K+53.0%78.3K2.56
Dec 13, 2024130.9K+2.78K+2.2%61.8K2.12
Nov 29, 2024128.2K−4.06K−3.1%106.2K1.21
Nov 15, 2024132.2K+5.74K+4.5%54.0K2.45
Oct 31, 2024126.5K−27.0K−17.6%29.0K4.37

Fails-to-deliver

Shares that weren't delivered by the settlement date, from the SEC, for the last 30 dates with fails. The price is the previous day's closing price published by the SEC.

Fails-to-deliver in NGS by settlement date
Settlement dateSharesPriceValue
Oct 13, 202682$32.90$2.70K
Oct 9, 202682$33.18$2.72K
Oct 6, 2026167$33.58$5.61K
Sep 29, 202624,178$32.75$791.8K
Sep 17, 202622$36.15$795.3
Sep 14, 20261,798$37.87$68.1K
Sep 10, 20263,404$38.08$129.6K
Sep 9, 202611,987$36.93$442.7K
Sep 8, 202611,435$36.33$415.4K
Sep 3, 20264,110$35.30$145.1K
Aug 24, 2026466$35.49$16.5K
Aug 11, 20266$36.97$221.82
Aug 5, 2026514$37.23$19.1K
Jul 29, 2026717$35.76$25.6K
Jul 16, 202642$41.11$1.73K
Jun 12, 2026834$42.42$35.4K
Jun 8, 202677$39.87$3.07K
May 22, 2026434$42.36$18.4K
May 21, 2026434$42.42$18.4K
May 20, 2026877$43.39$38.1K
May 19, 2026877$43.73$38.4K
May 18, 202626,718$42.40$1.13M
May 15, 202622,718$42.09$956.2K
May 12, 2026242$40.14$9.71K
Apr 22, 20262$37.30$74.6
Mar 13, 20262,389$36.17$86.4K
Mar 9, 202629,502$37.80$1.12M
Feb 13, 202654$36.39$1.97K
Feb 10, 20261$36.57$36.57
Feb 9, 20262,147$36.48$78.3K

Daily short volume

Off-exchange short-sale volume, not short interest: shares sold short each day in trades reported to FINRA, for the last 30 trading days.

The short volume ratio isn't a sentiment gauge: market makers sell short to fill buy orders and to hedge, so short sales are usually about half of off-exchange volume.

Off-exchange short volume in NGS by trade date
Trade dateShort volumeShort exemptOff-exchange volumeShort volume ratio
Nov 13, 202621,419049,85943.0%
Nov 12, 202617,262049,46134.9%
Nov 11, 202618,788065,78528.6%
Nov 10, 202623,931045,82952.2%
Nov 9, 202627,171063,36742.9%
Nov 6, 202622,7999059,52738.3%
Nov 5, 202627,941077,83335.9%
Nov 4, 20269,107043,00721.2%
Nov 3, 20267,403017,18643.1%
Nov 2, 202621,73194349,19644.2%
Oct 30, 202611,596026,09744.4%
Oct 29, 202611,233019,13358.7%
Oct 28, 202614,0284037,53737.4%
Oct 27, 202610,46184017,37360.2%
Oct 26, 20268,5688921,60939.7%
Oct 23, 202617,89229631,88856.1%
Oct 22, 202620,733036,93256.1%
Oct 21, 202610,046018,04955.7%
Oct 20, 202611,732018,97861.8%
Oct 19, 202612,087024,36849.6%
Oct 16, 202614,845037,73839.3%
Oct 15, 202622,331039,22656.9%
Oct 14, 202611,97559850,25523.8%
Oct 13, 20269,161015,44859.3%
Oct 12, 20268,997018,30949.1%
Oct 9, 202623,164028,70980.7%
Oct 8, 20269,994014,09370.9%
Oct 7, 202617,577025,50768.9%
Oct 6, 202613,120024,01654.6%
Oct 5, 202623,695159,47639.8%

ATS (dark pool) volume

Weekly volume on alternative trading systems (ATS) and other off-exchange (OTC) venues, from FINRA, for the last 12 weeks. ATS share is ATS volume ÷ (ATS + OTC volume), not a share of all trading.

Weekly ATS and OTC volume in NGS
Week ofTierATS sharesATS tradesOther OTC sharesOther OTC tradesATS share
Oct 5, 2026T2101,7074,39981,3991,19955.5%
Sep 28, 2026T2147,5366,81666,0171,90169.1%
Sep 21, 2026T2116,1186,70578,6151,97459.6%
Sep 14, 2026T2129,9979,640125,5921,77650.9%
Sep 7, 2026T2134,3567,971123,9241,43852.0%
Aug 31, 2026T2124,9116,04369,9941,74264.1%
Aug 24, 2026T2101,5755,998110,9241,86247.8%
Aug 17, 2026T2182,9698,244248,2562,14442.4%
Aug 10, 2026T2182,7158,807108,5912,18462.7%
Aug 3, 2026T290,9886,696104,0561,86746.6%
Jul 27, 2026T2190,0767,486127,9602,00359.8%
Jul 20, 2026T2205,4089,57693,1781,66468.8%