Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in TUSK held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | WEXFORD CAPITAL LP | 22.1M | $54.1M | -0.1% | 45.813% | 8.91% |
| 2 | ADAGE CAPITAL PARTNERS GP, L.L.C. | 4.6M | $11.2M | 0.0% | 9.498% | 0.02% |
| 3 | BlackRock, Inc. | 1.5M | $3.6M | -1.2% | 3.020% | 0.00% |
| 4 | VANGUARD CAPITAL MANAGEMENT LLC | 819K | $2.0M | β | 1.700% | 0.00% |
| 5 | DIMENSIONAL FUND ADVISORS LP | 686K | $1.7M | -1.9% | 1.425% | 0.00% |
| 6 | Peapod Lane Capital LLC | 600K | $1.5M | β | 1.245% | 1.24% |
| 7 | GEODE CAPITAL MANAGEMENT, LLC | 611K | $1.5M | +4.3% | 1.268% | 0.00% |
| 8 | STATE STREET CORP | 422K | $1.0M | +3.3% | 0.876% | 0.00% |
| 9 | CITADEL ADVISORS LLC | 342K | $838K | +55.4% | 0.710% | 0.00% |
| 10 | BRIDGEWAY CAPITAL MANAGEMENT, LLC | 332K | $814K | -18.9% | 0.690% | 0.02% |
| 11 | Empowered Funds, LLC | 241K | $591K | +10.2% | 0.501% | 0.00% |
| 12 | RENAISSANCE TECHNOLOGIES LLC | 232K | $568K | +24.7% | 0.482% | 0.00% |
| 13 | GOLDMAN SACHS GROUP INC | 223K | $548K | +148.5% | 0.464% | 0.00% |
| 14 | NORTHERN TRUST CORP | 187K | $458K | +11.5% | 0.389% | 0.00% |
| 15 | VANGUARD FIDUCIARY TRUST CO | 170K | $417K | β | 0.353% | 0.00% |
| 16 | LOS ANGELES CAPITAL MANAGEMENT LLC | 163K | $400K | β | 0.339% | 0.00% |
| 17 | Boston Partners | 154K | $378K | β | 0.321% | 0.00% |
| 18 | MORGAN STANLEY | 153K | $374K | -47.8% | 0.317% | 0.00% |
| 19 | VANGUARD PORTFOLIO MANAGEMENT LLC | 140K | $343K | β | 0.291% | 0.00% |
| 20 | Bank of New York Mellon Corp | 133K | $325K | -0.1% | 0.275% | 0.00% |
| 21 | Centiva Capital, LP | 111K | $272K | +168.9% | 0.231% | 0.00% |
| 22 | STIFEL FINANCIAL CORP | 106K | $259K | 0.0% | 0.219% | 0.00% |
| 23 | ADVISOR GROUP HOLDINGS, INC. | 72K | $177K | -9.1% | 0.150% | 0.00% |
| 24 | WELLINGTON MANAGEMENT GROUP LLP | 68K | $168K | +21.3% | 0.142% | 0.00% |
| 25 | Russell Investments Group, Ltd. | 68K | $167K | -72.5% | 0.141% | 0.00% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). β% of Fundβ shows how much of that investorβs total 13F portfolio is invested in TUSK β a direct measure of their conviction.
Filings activity in TUSK during Q1 2026, grouped by how each filer changed its position.
Institutions that opened a new TUSK position in Q1 2026
Institutions that fully closed their TUSK position in Q1 2026
8 quarters of 13F filings Β· Ξ columns show change vs prior quarter
| Quarter | Inst. Holders | Ξ Holders | Ownership % | Ξ Ownership | Total 13F Value | Ξ Value |
|---|---|---|---|---|---|---|
| Q1 2026 | 86 | +21% | 53.86% | +13.90 pp | $85M | +35% |
| Q4 2025 | 71 | 4.1% | 39.96% | 12.09 pp | $63M | 23% |
| Q3 2025 | 74 | +12% | 52.05% | 12.03 pp | $82M | 19% |
| Q2 2025 | 66 | +0.0% | 64.08% | +16.52 pp | $102M | +35% |
| Q1 2025 | 66 | +0.0% | 47.56% | 23.15 pp | $75M | 33% |
| Q4 2024 | 66 | +3.1% | 70.71% | 16.37 pp | $112M | 19% |
| Q3 2024 | 64 | 5.9% | 87.08% | +14.67 pp | $138M | +20% |
| Q2 2024 | 68 | β | 72.41% | β | $115M | β |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Ξ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying TUSK stock.
Based on Q1 2026 13F filings, institutional ownership of Mammoth Energy Services, Inc. stands at 53.9%, held across 86 reporting institutions.
WEXFORD CAPITAL LP is the largest reported institutional holder of TUSK, with approximately 22,068,212 shares worth $0.05B as of Q1 2026.
Yes β 2 widely-followed marquee investors appear among the top 25 institutional holders of TUSK, including CITADEL ADVISORS LLC, RENAISSANCE TECHNOLOGIES LLC.
Our composite Smart Money Score for TUSK is 70 out of 100 (Bullish). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
30 institutions opened new positions in TUSK during Q1 2026, while 15 fully exited. 44 added to existing positions and 10 trimmed.
TUSK institutional ownership rose by 13.90 percentage points quarter-over-quarter, with a net change of +15 holders.
The top 10 institutions account for 91.6% of all reported 13F value in TUSK, and the top 25 account for 98.0%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
Mammoth Energy Services, Inc. (TUSK) Institutional Ownership