As of November 6, 2026, 2 holders' latest Schedule 13D or 13G filings report owning 5% or more of Mammoth Energy Services, Inc. The largest reported stake is Wexford Capital LP's, at 25.06%. 3 filings are on record since August 14, 2025 (Schedule 13G/A, June 22, 2026).
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Key facts
- · Reporting person: Wexford Capital LP · Sole voting: 0 · Shared voting: 12,071,823 · Sole dispositive: 0 · Shared dispositive: 12,071,823 · SCHEDULE 13G/A, 2026-06-22
- · Reporting person: Charles E. Davidson · Sole voting: 6,470,441 · Shared voting: 0 · Sole dispositive: 6,470,441 · Shared dispositive: 0 · SCHEDULE 13G, 2026-06-22
- · Reporting person: Valueworks Limited Partners, LP · Sole voting: 0 · Shared voting: 1,891,521 · Sole dispositive: 0 · Shared dispositive: 1,891,521 · SCHEDULE 13G/A, 2025-08-14
Mammoth Energy Services, Inc. has 3 Schedule 13D or 13G filings on record since 2025-08-14. 2 holders' latest filing reports 5% or more of common stock, $0.01 par value. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| Wexford Capital LP | 25.06% | 12,071,823 | SCHEDULE 13G/A, 2026-06-22 | 2026-06-17 |
| 13.43% | 6,470,441 | SCHEDULE 13G, 2026-06-22 | 2026-06-17 | |
| Valueworks LLC | 4.96% | 2,389,031 | SCHEDULE 13G/A, 2025-08-14 | 2025-06-30 |
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More on Mammoth Energy Services, Inc. and the records around it.
Mammoth Energy Services, Inc. elsewhere on the record
Companies that share a holder
- Charles E. Davidson also filed stake reports on 1 other company: Nephros, Inc. (Sep 2026)
- Wexford Capital LP also filed stake reports on 5 other companies: Nephros, Inc. (Sep 2026), MOBILICOM LIMITED (Jul 2026), SOLITARIO RESOURCES CORP. (Feb 2026)
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What the Full Report on Mammoth Energy Services, Inc. covers
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Which Company This Is
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Voting and dispositive power, as filed
| Reporting person | Sole voting | Shared voting | Sole dispositive | Shared dispositive | Filing |
|---|---|---|---|---|---|
| Wexford Capital LP | 0 | 12,071,823 | 0 | 12,071,823 | SCHEDULE 13G/A, 2026-06-22 |
| Wexford GP LLC | 0 | 12,071,823 | 0 | 12,071,823 | SCHEDULE 13G/A, 2026-06-22 |
| Charles E. Davidson | 0 | 12,071,823 | 0 | 12,071,823 | SCHEDULE 13G/A, 2026-06-22 |
| Joseph M. Jacobs | 0 | 12,071,823 | 0 | 12,071,823 | SCHEDULE 13G/A, 2026-06-22 |
| Charles E. Davidson | 6,470,441 | 0 | 6,470,441 | 0 | SCHEDULE 13G, 2026-06-22 |
| CD Holding Company, LLC | 4,066,610 | 0 | 4,066,610 | 0 | SCHEDULE 13G, 2026-06-22 |
| Valueworks Limited Partners, LP | 0 | 1,891,521 | 0 | 1,891,521 | SCHEDULE 13G/A, 2025-08-14 |
| Valueworks Capital, LLC | 0 | 1,891,521 | 0 | 1,891,521 | SCHEDULE 13G/A, 2025-08-14 |
| Valueworks LLC | 0 | 2,389,031 | 0 | 2,389,031 | SCHEDULE 13G/A, 2025-08-14 |
| Charles Lemonides | 0 | 2,389,031 | 0 | 2,389,031 | SCHEDULE 13G/A, 2025-08-14 |
The latest filing identifies Mammoth Energy Services, Inc. by CUSIP 56155L108 and gives its principal executive office as 14201 Caliber Drive, Suite 300, Oklahoma City, OK 73134 (SCHEDULE 13G/A, 2026-06-22).
What the percentages are based on
The information required by Item 4(b) is set forth in Row 11 of the cover page for each of the Reporting Persons and is incorporated herein by reference. The information in Row 11 is calculated on the basis of 48,170,647 shares of Common Stock issued and outstanding as of May 5, 2026, as reported by the Issuer in the Schedule 14A filed by the Issuer with the Securities and Exchange Commission on May 15, 2026.Wexford Capital LP, SCHEDULE 13G/A, 2026-06-22
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2025-08-14 | Valueworks LLC | 4.96% | SCHEDULE 13G/A |
| 2026-06-22 | Wexford Capital LP | 25.06% | SCHEDULE 13G/A |
| 2026-06-22 | Charles E. Davidson | 13.43% | SCHEDULE 13G |
Questions about who owns Mammoth Energy Services, Inc.
Who owns Mammoth Energy Services, Inc.?
On this page, 2 holders' latest ownership filings report 5% or more of Mammoth Energy Services, Inc.: Wexford Capital LP (25.06%, Schedule 13G/A, filed 2026-06-22) and Charles E. Davidson (13.43%, Schedule 13G, filed 2026-06-22).
Who are the largest shareholders of Mammoth Energy Services, Inc.?
By the share each holder's latest filing reports, the largest holders of Mammoth Energy Services, Inc. on this page are Wexford Capital LP (25.06%) and Charles E. Davidson (13.43%).
When did Wexford Capital LP buy into Mammoth Energy Services, Inc.?
The filings give report dates, not purchase dates. The earliest filing from Wexford Capital LP on this page is the Schedule 13G/A, filed 2026-06-22, reporting 25.06%. That earliest filing is itself an amendment, which updates an earlier report.
Is this an audit or a full list?
Neither. The ownership list on this page covers only Schedule 13D and 13G filings, which holders make once they own 5% or more of a class of shares (an amendment can report a stake that has since fallen below 5%); 3 such filings are shown here. It is not an audit and not a full cap table: holders who never reached 5% are not listed, and a stake can change after its latest filing.
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Where this comes from
Anyone who comes to own more than 5% of a class of a listed company's voting shares has to tell the SEC. A holder who may seek to change or influence the company files Schedule 13D, and has to say in Item 4, "Purpose of Transaction", what it intends to do. A holder with no such intent, such as many index and passive funds, may file the shorter Schedule 13G. Both are amended when the stake changes, including when it falls below 5%.
Every row here is one of those filings, linked to the filing itself. Percentages and share counts are exactly as the holder filed them, for the holder the filing names; an amendment showing a lower figure is shown as filed. Item 4 text is quoted word for word. Where a 13D's Item 4 contains a sentence stating a definite intent to influence the company, that sentence is marked and quoted; the page does not describe the holder or its motives beyond the words it filed. Nothing here is investment advice.