TUSK
MAMMOTH ENERGY SERVICES, INC.
Oil & Gas Field Services, NECNasdaqAccelerated filer<br>Smaller reporting company
Total Trades
13
Buys
5
Sells
8
Largest Trade
$100K–$500K
Insiders
5
Institutional Funds
50
Inst. Value
$1M+
Activist Filings
6
Insider Trades
| Insider | Title | Type | Value | Shares | Price | Date |
|---|---|---|---|---|---|---|
| Amron Arthur H | Director | BUY | $15K–$50K | 10K | $1.89 | Dec 15, 2025 |
| SMITH ARTHUR L | Director | SELL | $50K–$100K | 20K | $2.51 | May 27, 2025 |
| SMITH ARTHUR L | Director | SELL | $100K–$500K | 65K | $2.51 | May 21, 2025 |
| Booker Corey J. | Director | SELL | $50K–$100K | 25K | $3.45 | Nov 26, 2024 |
| Booker Corey J. | Director | SELL | $15K–$50K | 12K | $3.23 | Nov 22, 2024 |
| Booker Corey J. | Director | SELL | $15K–$50K | 11K | $3.62 | Nov 15, 2024 |
| Booker Corey J. | Director | SELL | $1K–$15K | 4K | $3.62 | Nov 12, 2024 |
| Amron Arthur H | Director | BUY | $15K–$50K | 5K | $3.62 | May 30, 2024 |
| SMITH ARTHUR L | Director | SELL | $100K–$500K | 20K | $7.07 | Nov 14, 2022 |
| WEXFORD CAPITAL LP | Director | BUY | $50K–$100K | 45K | $2.14 | Jun 21, 2022 |
| WEXFORD CAPITAL LP | Director | BUY | $100K–$500K | 51K | $2.31 | Jun 15, 2022 |
| WEXFORD CAPITAL LP | Director | BUY | $100K–$500K | 98K | $2.47 | Jun 10, 2022 |
| Layton Mark E. | CFO and Secretary | SELL | $50K–$100K | 40K | $2.04 | Mar 11, 2022 |
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Institutional Ownership
13F filings as of Dec 31, 2025 · 50 funds holding
| Fund | Shares | Value | Type |
|---|---|---|---|
| WEXFORD CAPITAL LP | 22.1M | $1M+ | SH |
| VANGUARD GROUP INC | 843K | $1M+ | SH |
| DIMENSIONAL FUND ADVISORS LP | 668K | $1M+ | SH |
| GEODE CAPITAL MANAGEMENT, LLC | 504K | $500K+ | SH |
| STATE STREET CORP | 408K | $500K+ | SH |
| Empowered Funds, LLC | 219K | $100K–$500K | SH |
| Empowered Funds, LLC | 219K | $100K–$500K | SH |
| RENAISSANCE TECHNOLOGIES LLC | 186K | $100K–$500K | SH |
| JPMORGAN CHASE & CO | 146K | $100K–$500K | SH |
| STIFEL FINANCIAL CORP | 106K | $100K–$500K | SH |
| ACADIAN ASSET MANAGEMENT LLC | 107K | $100K–$500K | SH |
| GOLDMAN SACHS GROUP INC | 90K | $100K–$500K | SH |
| MORGAN STANLEY | 80K | $100K–$500K | SH |
| Squarepoint Ops LLC | 76K | $100K–$500K | SH |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 71K | $100K–$500K | SH |
| Centiva Capital, LP | 41K | $50K–$100K | SH |
| BARCLAYS PLC | 38K | $50K–$100K | SH |
| LANDSCAPE CAPITAL MANAGEMENT, L.L.C. | 38K | $50K–$100K | SH |
| JANE STREET GROUP, LLC | 37K | $50K–$100K | SH |
| RHUMBLINE ADVISERS | 33K | $50K–$100K | SH |
Activist & 5%+ Owners
SC 13D/13G filings — investors holding 5%+ of outstanding shares
VALUEWORKS LIMITED PARTNERS, LP
SC 13G/A · Aug 14, 2025
3.9%
1.9M shares
ValueWorks Limited Partners, LP
SC 13G/A · Nov 14, 2024
4.6%
2.2M shares
ValueWorks Limited Partners, LP
SC 13G/A · Feb 13, 2024
4.9%
2.4M shares
ValueWorks Limited Partners, LP
SC 13G · Feb 10, 2023
5.1%
2.4M shares
SC 13G/A · Feb 1, 2023
50.0%
22.5M shares
SC 13G · Apr 21, 2022
6.1%
2.9M shares