Latest Period
Q4 2025
Security Snapshot
MAMMOTH ENERGY SERVICES, INC. - Common Stock, $0.01 par value (TUSK) Institutional Ownership
CUSIP: 56155L108
13F Institutional Holders and Ownership History from Q4 2016 to Q1 2026
Institutions Reporting
71
Shares (Excl. Options)
34,368,035
Price
$1.85
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- Type / Class
- Equity / Common Stock, $0.01 par value
- Symbol
- TUSK on Nasdaq
- Shares outstanding
- 48,165,948
- Price per share
- $2.41
- All holders as of 31 Dec 2025
- Q4 2025
- Total 13F shares
- 34,368,035
- Total reported value
- $63,578,088
- % of total 13F portfolios
- 0%
- Share change
- -1,694,688
- Value change
- -$3,324,677
- Number of holders
- 71
- Price from insider filings
- $2.41
Reported Shares, Excluding Options vs Price
Reported Value, Excluding Options
Total Investors
Quick Takeaways
- TUSK - MAMMOTH ENERGY SERVICES, INC. - Common Stock, $0.01 par value is tracked under CUSIP 56155L108.
- 71 institutions reported positions in Q4 2025.
- 1 significant owner is listed from Schedule 13D/13G reporting.
What Changed
- Holder count moved from 71 to 10 between Q4 2025 and Q1 2026.
- Reported value moved from $63,578,088 to $161,299.
Why This Matters
- You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
- 13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.
Source Evidence
Source: SEC Form 13F
Open SEC Evidence
Latest holder context comes from 71 institutions filings for Q4 2025.
Investment Quick Answers
What is CUSIP 56155L108?
CUSIP 56155L108 identifies TUSK - MAMMOTH ENERGY SERVICES, INC. - Common Stock, $0.01 par value in SEC 13F datasets.
Where can I see the latest institutional holders?
Review the Q4 2025 holders report and the ownership history table below.
Next ownership checks
Use the next link that matches the question you still need to answer about this security.
- Latest 13F filings when you want to inspect fresh institutional portfolio moves.
- Latest Schedule 13D/13G reports when you need large-owner changes outside the 13F cycle.
- All institutional ownership pages to compare this security with other holder-history pages.
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 56155L108:
Significant Owners of MAMMOTH ENERGY SERVICES, INC. - Common Stock, $0.01 par value (TUSK) based on Schedule 13D/G filings
| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| VALUEWORKS LLC | 5% | $6,689,287 | 2,389,031 | VALUEWORKS LLC | 30 Jun 2025 |
As of 31 Dec 2025, 71 institutional investors reported holding 34,368,035 shares of MAMMOTH ENERGY SERVICES, INC. - Common Stock, $0.01 par value (TUSK). This represents 71% of the company’s total 48,165,948 outstanding shares.
Top 25 Institutional Shareholders
The largest institutional shareholders of MAMMOTH ENERGY SERVICES, INC. - Common Stock, $0.01 par value (TUSK) together control 70% of the company’s outstanding shares — a level of ownership often associated with strong institutional conviction and long‑term capital commitment.
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| WEXFORD CAPITAL LP | 46% | 22,096,068 | 0% | 11% | $40,877,721 |
| ADAGE CAPITAL PARTNERS GP, L.L.C. | 9.5% | 4,575,000 | 0% | 0.01% | $8,463,750 |
| BlackRock, Inc. | 3.1% | 1,473,044 | +1.4% | 0% | $2,725,131 |
| VANGUARD GROUP INC | 2.1% | 1,022,411 | +8.1% | 0% | $1,891,461 |
| DIMENSIONAL FUND ADVISORS LP | 1.5% | 699,678 | -25% | 0% | $1,294,365 |
| GEODE CAPITAL MANAGEMENT, LLC | 1.2% | 585,719 | +1.1% | 0% | $1,083,694 |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC | 0.85% | 409,991 | +5.1% | 0.02% | $758,483 |
| STATE STREET CORP | 0.85% | 408,484 | +0.39% | 0% | $755,695 |
| MORGAN STANLEY | 0.61% | 292,698 | +101% | 0% | $541,492 |
| Russell Investments Group, Ltd. | 0.51% | 247,491 | +11736% | 0% | $457,858 |
| CITADEL ADVISORS LLC | 0.46% | 220,111 | -18% | 0% | $407,205 |
| Empowered Funds, LLC | 0.45% | 218,991 | +10% | 0.01% | $405,133 |
| RENAISSANCE TECHNOLOGIES LLC | 0.39% | 186,072 | +39% | 0% | $344,233 |
| NORTHERN TRUST CORP | 0.35% | 167,845 | -13% | 0% | $310,514 |
| JPMORGAN CHASE & CO | 0.34% | 165,984 | -9.2% | 0% | $307,070 |
| Bank of New York Mellon Corp | 0.28% | 132,674 | -0.81% | 0% | $245,447 |
| ACADIAN ASSET MANAGEMENT LLC | 0.22% | 106,892 | +166% | 0% | $195,000 |
| STIFEL FINANCIAL CORP | 0.22% | 105,572 | -0.28% | 0% | $195,308 |
| Corient Private Wealth LLC | 0.2% | 97,902 | 0% | $181,119 | |
| GOLDMAN SACHS GROUP INC | 0.19% | 89,944 | +73% | 0% | $166,396 |
| OSAIC HOLDINGS, INC. | 0.17% | 79,686 | +156% | 0% | $147,390 |
| Squarepoint Ops LLC | 0.16% | 76,164 | 0% | $140,903 | |
| LANDSCAPE CAPITAL MANAGEMENT, L.L.C. | 0.15% | 72,619 | 0.01% | $134,345 | |
| FRANKLIN RESOURCES INC | 0.15% | 72,088 | +357% | 0% | $133,363 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 0.15% | 70,674 | 0% | 0% | $130,747 |
Institutional Holders of MAMMOTH ENERGY SERVICES, INC. - Common Stock, $0.01 par value (TUSK) across Reporting Periods
| Period | Reported Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q1 | 65,837 | $161,299 | +$9,588 | $2.45 | 10 |
| 2025 Q4 | 34,368,035 | $63,578,088 | -$3,324,677 | $1.85 | 71 |
| 2025 Q3 | 36,061,179 | $82,580,792 | -$870,793 | $2.29 | 76 |
| 2025 Q2 | 36,401,771 | $101,932,908 | -$2,372,899 | $2.80 | 65 |
| 2025 Q1 | 37,314,723 | $76,123,343 | -$545,490 | $2.04 | 65 |
| 2024 Q4 | 37,547,160 | $112,640,237 | -$189,407 | $3.00 | 65 |
| 2024 Q3 | 37,132,133 | $151,869,502 | -$5,363,205 | $4.09 | 64 |
| 2024 Q2 | 38,733,905 | $127,045,272 | -$926,585 | $3.28 | 66 |
| 2024 Q1 | 38,989,636 | $141,899,492 | -$1,301,256 | $3.64 | 65 |
| 2023 Q4 | 39,323,837 | $175,382,941 | -$1,190,175 | $4.46 | 67 |
| 2023 Q3 | 39,576,263 | $183,640,137 | +$4,122,238 | $4.64 | 74 |
| 2023 Q2 | 38,654,601 | $186,701,248 | +$2,176,068 | $4.83 | 72 |
| 2023 Q1 | 38,362,997 | $161,890,696 | +$2,610,048 | $4.22 | 76 |
| 2022 Q4 | 37,381,089 | $323,249,178 | +$3,961,969 | $8.65 | 77 |
| 2022 Q3 | 36,968,448 | $126,060,154 | +$6,404,759 | $3.41 | 53 |
| 2022 Q2 | 12,646,544 | $27,819,093 | +$5,672,434 | $2.20 | 47 |
| 2022 Q1 | 10,077,362 | $21,461,343 | +$4,524,306 | $2.13 | 45 |
| 2021 Q4 | 7,984,109 | $14,532,122 | +$305,369 | $1.82 | 42 |
| 2021 Q3 | 7,590,887 | $22,093,189 | +$1,066,479 | $2.91 | 43 |
| 2021 Q2 | 29,197,357 | $134,015,916 | -$31,266,582 | $4.59 | 49 |
| 2021 Q1 | 28,821,230 | $186,224,971 | +$33,094,718 | $5.32 | 51 |
| 2020 Q4 | 28,848,837 | $128,377,522 | +$1,866,250 | $4.45 | 44 |
| 2020 Q3 | 28,572,064 | $45,714,403 | -$1,383,948 | $1.60 | 33 |
| 2020 Q2 | 29,596,611 | $34,924,522 | -$976,783 | $1.18 | 46 |
| 2020 Q1 | 30,904,787 | $23,136,665 | -$2,789,600 | $0.75 | 55 |
| 2019 Q4 | 32,417,235 | $71,315,662 | -$5,948,187 | $2.20 | 69 |
| 2019 Q3 | 34,467,666 | $85,490,044 | -$7,637,996 | $2.48 | 86 |
| 2019 Q2 | 36,162,372 | $248,800,594 | -$31,054,786 | $6.88 | 97 |
| 2019 Q1 | 37,036,859 | $616,675,400 | +$8,870,807 | $16.65 | 134 |
| 2018 Q4 | 36,425,113 | $655,369,091 | +$19,861,102 | $17.98 | 127 |
| 2018 Q3 | 35,050,749 | $1,021,370,214 | -$60,906,238 | $29.10 | 135 |
| 2018 Q2 | 36,821,466 | $1,250,503,738 | +$129,250,314 | $33.96 | 144 |
| 2018 Q1 | 32,921,605 | $1,055,477,610 | +$38,860,450 | $32.06 | 104 |
| 2017 Q4 | 31,756,632 | $623,406,658 | -$22,069,313 | $19.63 | 63 |
| 2017 Q3 | 32,760,972 | $552,346,269 | -$2,102,616 | $16.86 | 58 |
| 2017 Q2 | 32,689,363 | $608,025,810 | +$134,972,398 | $18.60 | 65 |
| 2017 Q1 | 28,173,489 | $606,010,527 | +$9,736,067 | $21.51 | 73 |
| 2016 Q4 | 28,267,810 | $429,642,932 | +$427,775,931 | $15.20 | 64 |