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ISSUER PROFILE · CIK 0001084991 · CUSIP 63886Q109

NATURAL GAS SERVICES GROUP INCNGS

6 13D/G filings 2 distinct filers 0 insider transactions (365d)

Post-Filing Returns · across 4 activist filings on this issuer

Median 30d
avg —
Median 60d
avg —
Median 90d
avg —
Median 180d
avg —

Returns measured from each activist filing's date_of_event, split + dividend adjusted via Yahoo Finance.

Cross-Reference Snapshot

Activist filings
6
4 SCHEDULE · 2 SC
Distinct filers
2
multi-activist cluster
Insiders (365d)
0
0 buys · 0 sales
Latest short DTC
2.53
as of 2026-05-29

13D/G Filings Timeline · 6 total

FiledFormFilerStakeSharesIntent
2026-01-26 SCHEDULE Hoak Public Equities, LP 4.57% 575,000 view →
2026-01-07 SCHEDULE Hoak Public Equities, LP 6.67% 838,128 view →
2025-01-23 SCHEDULE Mill Road Capital III, L.P. 4.30% 530,879 view →
2025-01-16 SCHEDULE Mill Road Capital III, L.P. 6.00% 754,564 view →
2023-05-03 SC Mill Road Capital III, L.P. view →
2023-01-11 SC Hoak Public Equities, LP view →

FINRA Short Interest History

SettlementShort InterestDays to Cover% Δ vs prior
2026-05-29 301,889 2.53 +9.2%
2026-05-15 276,369 2.71 +14.8%
2026-04-30 240,841 2.71 -11.7%
2026-04-15 272,665 3.53 +9.0%
2026-03-31 250,160 1.77 +2.4%
2026-03-13 244,257 2.02 -0.4%
2026-02-27 245,138 3.18 -2.9%
2026-02-13 252,463 1.99 +25.4%
2026-01-30 201,267 1.00 -11.3%
2026-01-15 226,935 1.53 -10.8%
2025-12-31 254,311 2.92 -14.4%
2025-12-15 297,065 3.08 +15.1%

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