TUSKNasdaqOil & Gas Field Services, NECFiscal year ends December 31
MAMMOTH ENERGY SERVICES, INC.
Financials through Q2 FY2026, quarter ended Jun 30, 2026Last filing: 10-Q on Aug 7, 2026
$2.70−0.00 (-0.18%)
Close on Oct 19, 2026
- Market cap
- $130.04M
- P/E (TTM)
- 135.0
- Dividend yield
- –
Ownership
Institutional holdings as of Jun 30, 2026, from 13F filings
Held by institutions
54.2%
26M of 48M shares
Institutional holders
94
28 new, 23 sold out
Net institutional buying
-9M
In Q2 2026
Insider trades, 12 months
7 buys · 0 sales
Net bought $10.52M
Shares held by institutions
Holders of more than 5%
Latest Schedule 13D (active) or 13G (passive) filed by each holder
| Holder | Shares | % of class | Filing | As of |
|---|---|---|---|---|
| Charles E. Davidson | 6,470,441 | 13.43% | 13G (passive) | Jun 17, 2026 |
| Adage Capital Partners, L.P. | 4,275,000 | 8.92% | 13G (passive) amendment | Dec 31, 2023 |
| Wexford Capital LP | 12,071,823 | 25.06% | 13G (passive) amendment | Jun 17, 2026 |
Top institutional holders
13F holdings as of Jun 30, 2026
| Holder | Shares | % of TUSK | Value | Change | % of portfolio |
|---|---|---|---|---|---|
| Wexford Capital LP | 12,071,823 | 25.08% | $39.23M | −9,996,389 | 5.02% |
| Adage Capital Partners Gp, L.L.C. | 4,575,000 | 9.51% | $14.87M | – | 0.02% |
| Vanguard Capital Management LLC | 1,059,603 | 2.20% | $3.44M | +240,483 | 0.00% |
| Peapod Lane Capital LLC | 807,804 | 1.68% | $2.63M | +207,999 | 1.77% |
| Dimensional Fund Advisors LP | 691,667 | 1.44% | $2.25M | +5,468 | 0.00% |
| Jane Street Group, LLC | 506,662 | 1.05% | $1.65M | +483,808 | 0.00% |
| Citadel Advisors LLC | 452,163 | 0.94% | $1.47M | +120,796 | 0.00% |
| BlackRock, Inc. | 407,976 | 0.85% | $1.33M | −1,046,863 | 0.00% |
| Marshall Wace, Llp | 395,583 | 0.82% | $1.29M | New | 0.00% |
| Johns Hopkins University | 387,359 | 0.80% | $1.26M | New | 0.08% |
| Bridgeway Capital Management, LLC | 332,313 | 0.69% | $1.08M | – | 0.02% |
| Russell Investments Group, Ltd. | 329,821 | 0.69% | $1.07M | +261,791 | 0.00% |
| Geode Capital Management, LLC | 306,028 | 0.64% | $995.73K | −304,898 | 0.00% |
| Renaissance Technologies LLC | 292,280 | 0.61% | $949.91K | +60,308 | 0.00% |
| Arrowstreet Capital, Limited Partnership | 290,096 | 0.60% | $942.81K | New | 0.00% |
| Empowered Funds, LLC | 241,313 | 0.50% | $784.27K | – | 0.00% |
| Aqr Capital Management LLC | 177,824 | 0.37% | $577.93K | +111,093 | 0.00% |
| Vanguard Fiduciary Trust Co | 161,791 | 0.34% | $525.82K | −8,340 | 0.00% |
| Round Rock Advisors, LLC | 152,841 | 0.32% | $496.73K | New | 0.06% |
| Morgan Stanley | 133,560 | 0.28% | $434.07K | −19,163 | 0.00% |
Institutional buying and selling by quarter
Positions opened, added to, reduced and closed by 13F filers
| Quarter | Holders | Shares held | % of shares | New / added | Reduced / closed | Shares bought | Shares sold |
|---|---|---|---|---|---|---|---|
| Q2 2026 | 94 | 26M | 54.2% | 28 / 33 | 23 / 23 | 4M | 13M |
| Q1 2026 | 90 | 35M | 72.9% | 32 / 24 | 23 / 13 | 3M | 1M |
| Q4 2025 | 72 | 34M | 71.6% | 9 / 22 | 26 / 14 | 1M | 3M |
| Q3 2025 | 77 | 36M | 75.3% | 16 / 18 | 29 / 5 | 1M | 1M |
| Q2 2025 | 66 | 37M | 75.8% | 6 / 31 | 17 / 5 | 1M | 2M |
| Q1 2025 | 65 | 37M | 77.5% | 9 / 20 | 22 / 9 | 1M | 1M |
| Q4 2024 | 66 | 38M | 78.0% | 9 / 26 | 16 / 7 | 1M | 1M |
| Q3 2024 | 64 | 37M | 77.2% | 8 / 26 | 14 / 10 | 2M | 2M |
| Q2 2024 | 67 | 39M | 80.5% | 8 / 19 | 25 / 8 | 0M | 1M |
| Q1 2024 | 67 | 39M | 81.5% | 7 / 19 | 30 / 6 | 0M | 1M |
| Q4 2023 | 67 | 39M | 81.9% | 5 / 29 | 19 / 13 | 1M | 1M |
| Q3 2023 | 75 | 40M | 82.2% | 12 / 24 | 23 / 8 | 1M | 0M |
Top mutual fund and ETF holders
Latest monthly portfolio reports (Form N-PORT)
| Fund | Shares | % of TUSK | Value | % of fund | As of |
|---|---|---|---|---|---|
| Vanguard Total Stock Market Index Fund | 767,902 | 1.60% | $2.50M | 0.00% | Jun 30, 2026 |
| Vanguard Extended Market Index Fund | 270,943 | 0.56% | $880.56K | 0.00% | Jun 30, 2026 |
| EA Bridgeway Omni Small-Cap Value ETF | 241,313 | 0.50% | $784.27K | 0.03% | Jun 30, 2026 |
| U.S. Small Cap Portfolio | 156,438 | 0.33% | $414.56K | 0.00% | Jul 31, 2026 |
| Dimensional U.S. Small Cap ETF | 154,800 | 0.32% | $410.22K | 0.00% | Jul 31, 2026 |
| Fidelity Extended Market Index Fund | 140,820 | 0.29% | $471.75K | 0.00% | May 31, 2026 |
| U.S. Small Cap Equity Fund | 139,495 | 0.29% | $369.66K | 0.04% | Jul 31, 2026 |
| Vanguard Russell 2000 Index Fund | 123,590 | 0.26% | $414.03K | 0.00% | May 31, 2026 |
| Dunham Small Cap Value Fund | 91,271 | 0.19% | $241.87K | 0.26% | Jul 31, 2026 |
| iShares Micro-Cap ETF | 86,748 | 0.18% | $281.93K | 0.02% | Jun 30, 2026 |
| U.S. Micro Cap Portfolio | 84,048 | 0.17% | $222.73K | 0.00% | Jul 31, 2026 |
| Ultra-Small Company Market Fund | 60,000 | 0.12% | $195.00K | 0.13% | Jun 30, 2026 |
| Tax-Managed U.S. Mid & Small Cap Fund | 54,843 | 0.11% | $145.33K | 0.01% | Jul 31, 2026 |
| Fidelity Total Market Index Fund | 41,270 | 0.09% | $138.25K | 0.00% | May 31, 2026 |
| U.S. Small Cap Value Portfolio | 37,940 | 0.08% | $100.54K | 0.00% | Jul 31, 2026 |
Officers, directors and major owners
People who filed Forms 3, 4 or 5 in the last two years
| Name | Role | Shares owned | % of shares | Latest filing |
|---|---|---|---|---|
| Capital Lp Wexford | Chief Business Officer, Director, 10% owner | 44,413,018 | 92.28% | Jun 22, 2026 |
| GP LLC Wexford | Chief Business Officer, Director, 10% owner | 18,673,038 | 38.80% | Jun 22, 2026 |
| Paul M. Jacobi | Chief Business Officer, Director | 31,067 | 0.06% | Jun 22, 2026 |
| Joseph Jacobs | Chief Business Officer, Director, 10% owner | 43,004,443 | 89.36% | Jun 22, 2026 |
| Mark Lawrence Plaumann | Director | 5,000 | 0.01% | Sep 17, 2026 |
| Phillip Lancaster | Director | 159,445 | 0.33% | Jul 1, 2026 |
| Arthur H. Amron | Director | 67,135 | 0.14% | Jun 22, 2026 |
| Holdings LLC Amron | Director | 96,585 | 0.20% | Jun 22, 2026 |
| Arthur L. Smith | Director | 130,034 | 0.27% | May 27, 2025 |
| Corey J. Booker | Director | 125,488 | 0.26% | Nov 26, 2024 |
| Charles E. Davidson | 10% owner | 22,030,872 | 45.78% | Jun 22, 2026 |
| CD Holding Company, LLC | 10% owner | 6,470,441 | 13.44% | Jun 22, 2026 |
Insider trades
Common stock transactions reported on Form 4, newest first
| Insider | Date | Transaction | Shares | Price | Value | Shares after |
|---|---|---|---|---|---|---|
| Mark Lawrence Plaumann Director | Sep 16, 2026 | Buy | +5,000 | $3.00 | $15.00K | 5,000 |
| Phillip Lancaster Director | Jun 26, 2026 | Other | +68,152 | – | – | 159,445 |
| CD Holding Company, LLC 10% owner | Jun 17, 2026 | Other | +2,403,831 | – | – | 2,403,831 |
| CD Holding Company, LLC 10% owner | Jun 17, 2026 | Other | +4,066,610 | – | – | 4,066,610 |
| GP LLC Wexford Chief Business Officer, Director, 10% owner | Jun 17, 2026 | Other | +1,072,896 | – | – | 1,451,034 |
| GP LLC Wexford Chief Business Officer, Director, 10% owner | Jun 17, 2026 | Buy | +4,019,574 | $2.60 | $10.45M | 10,620,789 |
| GP LLC Wexford Chief Business Officer, Director, 10% owner | Jun 17, 2026 | Other | +6,354,667 | – | – | 6,601,215 |
| Holdings LLC Amron Director | Jun 17, 2026 | Other | +19,121 | – | – | 86,256 |
| Holdings LLC Amron Director | Jun 17, 2026 | Other | +10,329 | – | – | 10,329 |
| Paul M. Jacobi Chief Business Officer, Director | Jun 17, 2026 | Other | +3,211 | – | – | 31,067 |
| Arthur H. Amron Director | Jun 12, 2026 | Buy | +2,000 | $3.28 | $6.56K | 67,135 |
| Arthur H. Amron Director | Jun 11, 2026 | Buy | +2,500 | $3.22 | $8.05K | 65,135 |
| Arthur H. Amron Director | May 28, 2026 | Buy | +3,000 | $3.25 | $9.75K | 62,635 |
| Arthur H. Amron Director | May 26, 2026 | Buy | +2,500 | $3.24 | $8.10K | 59,635 |
| Arthur H. Amron Director | Dec 11, 2025 | Buy | +10,000 | $1.89 | $18.90K | 57,135 |
| Arthur L. Smith Director | May 22, 2025 | Sale | −20,000 | $2.51 | $50.20K | 130,034 |
| Arthur L. Smith Director | May 20, 2025 | Sale | −50,000 | $2.51 | $125.50K | 150,034 |
| Arthur L. Smith Director | May 19, 2025 | Sale | −15,000 | $2.49 | $37.35K | 200,034 |
| Arthur H. Amron Director | Dec 12, 2024 | Buy | +1,000 | $2.97 | $2.97K | 47,135 |
| Corey J. Booker Director | Nov 25, 2024 | Sale | −15,000 | $3.47 | $52.05K | 125,488 |
| Corey J. Booker Director | Nov 22, 2024 | Sale | −10,000 | $3.43 | $34.30K | 140,488 |
| Corey J. Booker Director | Nov 21, 2024 | Sale | −6,709 | $3.25 | $21.80K | 150,488 |
| Corey J. Booker Director | Nov 20, 2024 | Sale | −5,000 | $3.21 | $16.05K | 157,197 |
| Corey J. Booker Director | Nov 14, 2024 | Sale | −3,607 | $3.50 | $12.62K | 162,197 |
| Corey J. Booker Director | Nov 13, 2024 | Sale | −7,100 | $3.68 | $26.13K | 165,804 |
| Corey J. Booker Director | Nov 11, 2024 | Sale | −3,494 | $3.61 | $12.61K | 172,904 |
| Corey J. Booker Director | Nov 8, 2024 | Sale | −24 | $3.76 | $90 | 176,398 |
| Corey J. Booker Director | Nov 7, 2024 | Sale | −165 | $3.90 | $644 | 176,422 |
| Paul M. Jacobi Director | Jun 12, 2024 | Award | +27,856 | – | – | 27,856 |
| James D. Palm Director | Jun 12, 2024 | Award | +27,856 | – | – | 240,144 |
| Corey J. Booker Director | Jun 12, 2024 | Award | +27,856 | – | – | 176,587 |
| Arthur H. Amron Director | Jun 12, 2024 | Award | +27,856 | – | – | 46,135 |
| Arthur L. Smith Director | Jun 12, 2024 | Award | +27,856 | – | – | 215,034 |
| Arthur H. Amron Director | May 30, 2024 | Buy | +3,000 | $3.65 | $10.95K | 18,279 |
| Arthur H. Amron Director | May 28, 2024 | Buy | +2,000 | $3.57 | $7.14K | 15,279 |
| Charles E. Davidson Director, 10% owner | Mar 12, 2024 | Other | −535,366 | – | – | 21,690,075 |
| Arthur H. Amron Director | Mar 12, 2024 | Buy | +3,000 | $3.72 | $11.16K | 13,279 |
| Arty Straehla Chief Executive Officer, Director | Dec 19, 2023 | Sale | −40,000 | $4.35 | $174.00K | 1,012,107 |
| Arty Straehla Chief Executive Officer, Director | Dec 18, 2023 | Sale | −30,000 | $4.38 | $131.40K | 1,052,107 |
| Arty Straehla Chief Executive Officer, Director | Dec 15, 2023 | Sale | −40,000 | $4.36 | $174.40K | 1,082,107 |
| Arty Straehla Chief Executive Officer, Director | Dec 14, 2023 | Sale | −55,000 | $4.44 | $244.20K | 1,122,107 |
| Arty Straehla Chief Executive Officer, Director | Dec 13, 2023 | Sale | −25,000 | $4.39 | $109.75K | 1,177,107 |
| Arthur L. Smith Director | Jun 7, 2023 | Award | +23,810 | – | – | 187,178 |
| Paul M. Jacobi Director | Jun 7, 2023 | Award | +23,810 | – | – | 23,810 |
| Arthur H. Amron Director | Jun 7, 2023 | Award | +23,810 | – | – | 23,810 |
| James D. Palm Director | Jun 7, 2023 | Award | +23,810 | – | – | 212,288 |
| Corey J. Booker Director | Jun 7, 2023 | Award | +23,810 | – | – | 148,731 |
| Mark E. Layton CFO and Secretary | Mar 3, 2023 | Tax withholding | −36,375 | $5.55 | $201.88K | 418,985 |
| Arty Straehla Chief Executive Officer, Director | Mar 3, 2023 | Tax withholding | −129,220 | $5.55 | $717.17K | 1,202,107 |
| Arthur L. Smith Director | Nov 11, 2022 | Sale | −20,000 | $7.07 | $141.40K | 163,368 |
| Arthur H. Amron Director | Jun 29, 2022 | Award | +45,662 | – | – | 45,662 |
| Arthur L. Smith Director | Jun 29, 2022 | Award | +45,662 | – | – | 183,368 |
| James D. Palm Director | Jun 29, 2022 | Award | +45,662 | – | – | 188,478 |
| Corey J. Booker Director | Jun 29, 2022 | Award | +45,662 | – | – | 124,921 |
| Paul M. Jacobi Director | Jun 29, 2022 | Award | +45,662 | – | – | 45,662 |
| Capital Lp Wexford Director, 10% owner | Jun 17, 2022 | Buy | +10,382 | $2.17 | $22.53K | 22,434,125 |
| Capital Lp Wexford Director, 10% owner | Jun 16, 2022 | Buy | +35,000 | $2.13 | $74.55K | 22,423,743 |
| Joseph Jacobs Director, 10% owner | Jun 15, 2022 | Buy | +5,100 | $2.23 | $11.37K | 22,388,743 |
| Joseph Jacobs Director, 10% owner | Jun 14, 2022 | Buy | +20,600 | $2.28 | $46.97K | 22,383,643 |
| Joseph Jacobs Director, 10% owner | Jun 13, 2022 | Buy | +25,102 | $2.35 | $58.99K | 22,363,043 |
Awards, option exercises, tax withholding and gifts are shown alongside open-market buys and sales. Each name links to the filing on SEC EDGAR.
Planned insider sales
Notices of proposed sale filed on Form 144 before shares are sold
| Seller | Filed | Shares | Market value | Planned sale | Acquired through |
|---|---|---|---|---|---|
| Arthur L. Smith Director | Aug 12, 2025 | 102,178 | $231.00K | Aug 12, 2025 | Director Compensation |
| Arthur L. Smith Director | May 12, 2025 | 100,000 | $253.00K | May 12, 2025 | Board Compensation |
| Corey J. Booker Director | Nov 7, 2024 | 64,767 | $250.00K | Nov 7, 2024 | Grant by the issuer of restricted stock units (RSUs) to the reporting person under the issuer's equity incentive plan, which RSUs fully vested on June 2, 2021, with the underlying shares of common sto |
| Arty Straehla Officer | Dec 13, 2023 | 190,000 | $837.90K | Dec 13, 2023 | Stock Award |