TUSK — MAMMOTH ENERGY SERVICES, INC.
Price · 2024-08-26 → 2026-08-21
499 daily closes shownAnonymous view is capped at two years of history. A free account extends it to five, and Pro opens the whole archive back to 2016-10-14.
Performance
Technicals
Measured signals that fired on TUSK
| date | signal | measured base rate |
|---|---|---|
| 2026-06-22 | Cluster buy: three or more insiders insider | +0.63% over 21 days · t = 1.84 · n = 3,050 not distinguishable from its control group |
| 2026-06-22 | Conviction buy by an officer insider | -1.03% over 21 days · t = -2.24 · n = 1,083 statistically distinguishable from its control group |
| 2026-04-15 | Short volume far above its own normal short | -0.76% over 21 days · t = -2.79 · n = 5,897 statistically distinguishable from its control group |
Excess return against a matched control group, on a point-in-time universe that includes delisted companies. Most families do not survive that. How the measurement works →
Insider transactions (Form 4)
| date | insider | what | shares | price | value |
|---|---|---|---|---|---|
| 2026-06-26 | Lancaster Phillip Director | Other Acquisition/Disposition | 68.2K | 0.00 | 0 |
| 2026-06-17 | DAVIDSON CHARLES E Chief Business Officer | Open-market purchase | 4.0M | 2.60 | 10.5M |
| 2026-06-17 | WEXFORD CAPITAL LP Chief Business Officer | Open-market purchase | 4.0M | 2.60 | 10.5M |
| 2026-06-17 | Wexford GP LLC Chief Business Officer | Open-market purchase | 4.0M | 2.60 | 10.5M |
| 2026-06-17 | JACOBS JOSEPH Chief Business Officer | Open-market purchase | 4.0M | 2.60 | 10.5M |
| 2026-06-17 | DAVIDSON CHARLES E 10% owner | Other Acquisition/Disposition | 4.1M | 0.00 | 0 |
| 2026-06-17 | DAVIDSON CHARLES E 10% owner | Other Acquisition/Disposition | 2.4M | 0.00 | 0 |
| 2026-06-17 | Amron Arthur H Director | Other Acquisition/Disposition | 10.3K | 0.00 | 0 |
| 2026-06-17 | DAVIDSON CHARLES E Chief Business Officer | Other Acquisition/Disposition | 1.1M | 0.00 | 0 |
| 2026-06-17 | Amron Holdings LLC Director | Other Acquisition/Disposition | 10.3K | 0.00 | 0 |
Open-market purchases (code P) are the informative ones. Grants, option exercises and tax withholding are compensation mechanics, not decisions. How to read a Form 4 →
Largest institutional holders
| manager | value | shares |
|---|---|---|
| WEXFORD CAPITAL LP | 54.1M | 22.1M |
| ADAGE CAPITAL PARTNERS GP, L.L.C. | 11.2M | 4.6M |
| BlackRock, Inc. | 3.6M | 1.5M |
| VANGUARD CAPITAL MANAGEMENT LLC | 2.0M | 819.1K |
| DIMENSIONAL FUND ADVISORS LP | 1.7M | 686.2K |
| Peapod Lane Capital LLC | 1.5M | 599.8K |
| GEODE CAPITAL MANAGEMENT, LLC | 1.5M | 610.9K |
| STATE STREET CORP | 1.0M | 421.9K |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC | 814.2K | 332.3K |
| CITADEL ADVISORS LLC | 811.8K | 331.4K |
13F positions as of 2026-03-31, filed up to 45 days after quarter end. Long-only US equity — shorts and derivatives never appear. What 13F does and does not show →
Latest SEC filings
| form | filed | period | |
|---|---|---|---|
| 10-Q | 2026-08-07 | 2026-06-30 | on EDGAR ↗ |
| 8-K | 2026-08-07 | 2026-08-07 | on EDGAR ↗ |
| 4 | 2026-07-01 | 2026-06-26 | on EDGAR ↗ |
| 8-K | 2026-06-26 | 2026-06-25 | on EDGAR ↗ |
| SCHEDULE 13G | 2026-06-22 | — | on EDGAR ↗ |
| SCHEDULE 13G/A | 2026-06-22 | — | on EDGAR ↗ |
| 4 | 2026-06-22 | 2026-06-17 | on EDGAR ↗ |
| 4 | 2026-06-22 | 2026-06-17 | on EDGAR ↗ |
Short selling
This is off-exchange short volume, not short interest: it is flow, not position, and 40–50% is normal because market makers short to fill your buy. Why that number misleads →
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