Latest Period
Q2 2026
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 Q2 2026
Institutions Reporting
94
Shares (Excl. Options)
26,068,795
Price
$3.25
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- Security type / class
- Equity / Common Stock, $0.01 par value
- Symbol
- TUSK on Nasdaq
- All holders as of 30 Jun 2026
- Q2 2026
- Total 13F shares
- 26,068,795
- Total 13F value
- $84,716,597
- Portfolio coverage rank
- 0%
- Share change
- -9,065,429
- Value change
- -$29,013,311
- Number of holders
- 94
- Shares outstanding
- 48,179,010
- SEC-reported price per share
- $2.60
- Insider filing price
- $2.60
Latest holder snapshot
5 signals
Issuer context
Names, identifiers, and filing context for this profile.
3 identity fields
13F Shares, Excluding Options vs Price
13F Value, Excluding Options
Total Investors
Key facts
- TUSK - MAMMOTH ENERGY SERVICES, INC. - Common Stock, $0.01 par value is tracked under CUSIP 56155L108.
- 94 institutions reported positions in Q2 2026.
- 3 significant owners is listed from Schedule 13D/13G reporting.
Change
- Holder count moved from 89 to 94 between Q1 2026 and Q2 2026.
- SEC-reported value moved from $85,955,875 to $84,716,597.
Research use
- 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.
Evidence
Source: SEC Form 13F
Open SEC evidence
Latest holder context comes from 94 institutions filings for Q2 2026.
Security key
56155L108
Latest holder period
Q2 2026
13F holders
94
13D/G owners
3
CIK / CUSIP context first
Open Q2 2026 holders
TUSK full holder history
MAMMOTH ENERGY SERVICES, INC. SEC filings
MAMMOTH ENERGY SERVICES, INC. company facts
MAMMOTH ENERGY SERVICES, INC. insider transactions
Broader feeds
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 56155L108:
13D/G owners
Significant owners
Large-stake holder rows connected to Schedule 13D/G evidence.
Rows
3
Security
TUSK
| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| WEXFORD CAPITAL LP | 25% | $38,750,552 | 12,071,823 | Wexford Capital LP | 17 Jun 2026 | |||
| DAVIDSON CHARLES E | 13% | $20,770,116 | 6,470,441 | Charles E. Davidson | 17 Jun 2026 | |||
| VALUEWORKS LLC | 5% | $6,689,287 | 2,389,031 | VALUEWORKS LLC | 30 Jun 2025 |
As of 30 Jun 2026, 94 institutional investors reported holding 26,068,795 shares of MAMMOTH ENERGY SERVICES, INC. - Common Stock, $0.01 par value (TUSK). This represents 54% of the company’s total 48,179,010 outstanding shares.
13F concentration
Top 25 institutional shareholders
Largest 13F positions for this security by reported shares and value.
Top holder share
51%
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| WEXFORD CAPITAL LP | 25% | 12,071,823 | -45% | 5.4% | $39,233,425 |
| ADAGE CAPITAL PARTNERS GP, L.L.C. | 9.5% | 4,575,000 | 0% | 0.02% | $14,868,750 |
| VANGUARD CAPITAL MANAGEMENT LLC | 2.2% | 1,059,603 | +29% | 0% | $3,443,710 |
| Peapod Lane Capital LLC | 1.7% | 807,804 | +35% | 1.8% | $2,625,363 |
| DIMENSIONAL FUND ADVISORS LP | 1.4% | 691,667 | +0.8% | 0% | $2,247,249 |
| JANE STREET GROUP, LLC | 1.1% | 506,662 | +2117% | 0% | $1,646,651 |
| CITADEL ADVISORS LLC | 0.94% | 452,163 | +36% | 0% | $1,469,530 |
| BlackRock, Inc. | 0.85% | 407,976 | -72% | 0% | $1,325,923 |
| MARSHALL WACE, LLP | 0.82% | 395,583 | 0% | $1,285,645 | |
| Johns Hopkins University | 0.8% | 387,359 | 0.08% | $1,258,917 | |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC | 0.69% | 332,313 | 0% | 0.02% | $1,080,017 |
| Russell Investments Group, Ltd. | 0.68% | 329,821 | +385% | 0% | $1,071,918 |
| GEODE CAPITAL MANAGEMENT, LLC | 0.64% | 306,028 | -50% | 0% | $995,730 |
| RENAISSANCE TECHNOLOGIES LLC | 0.61% | 292,280 | +26% | 0% | $949,910 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | 0.6% | 290,096 | 0% | $942,812 | |
| Empowered Funds, LLC | 0.5% | 241,313 | 0% | 0% | $784,267 |
| AQR CAPITAL MANAGEMENT LLC | 0.37% | 177,824 | +166% | 0% | $577,928 |
| VANGUARD FIDUCIARY TRUST CO | 0.34% | 161,791 | -4.9% | 0% | $525,821 |
| Round Rock Advisors LLC | 0.32% | 152,841 | 0.06% | $496,733 | |
| MORGAN STANLEY | 0.28% | 133,560 | -13% | 0% | $434,070 |
| Centiva Capital, LP | 0.27% | 130,870 | +18% | 0.01% | $425,328 |
| GSA CAPITAL PARTNERS LLP | 0.27% | 129,547 | +831% | 0.03% | $421,000 |
| MILLENNIUM MANAGEMENT LLC | 0.26% | 124,186 | 0% | $403,604 | |
| ACADIAN ASSET MANAGEMENT LLC | 0.25% | 122,050 | -40% | 0% | $396,000 |
| Marquette Asset Management, LLC | 0.23% | 109,826 | 0.05% | $356,935 |
Quarter history
Institutional holders across reporting periods
Holder count, reported shares/value, and median price by quarter.
Periods
39
Latest
Q2 2026
Rows shown
1-25 of 39
| Period | 13F Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q2 | 26,068,795 | $84,716,597 | -$29,013,311 | $3.25 | 94 |
| 2026 Q1 | 35,063,800 | $85,955,875 | +$1,721,635 | $2.45 | 89 |
| 2025 Q4 | 34,368,035 | $63,578,088 | -$3,324,682 | $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 |