Mammoth Energy Services amended a Schedule 13G to report shared beneficial ownership of 12,071,823 shares of Common Stock by Wexford-related reporting persons, representing 25.06% of the class.
The percentage is calculated using 48,170,647 shares outstanding as of May 5, 2026. The filing states the shared power to vote and dispose of these shares and also includes disclaimers that the Reporting Persons disclaim beneficial ownership of the securities held by the Wexford Funds, except to the extent of pecuniary interests for certain individuals.
Positive
None.
Negative
None.
Insights
Wexford-affiliated entities report a substantial shared position in Mammoth Energy.
The filing lists a shared voting and dispositive interest in 12,071,823 shares, equal to 25.06% of the outstanding common stock calculated on May 5, 2026. This positions the Wexford Funds as a prominent holder in company governance discussions.
The report includes standard disclaimers that the Reporting Persons disclaim beneficial ownership of the Funds' shares; subsequent filings would clarify any changes in control or voting alignment.
Amendment clarifies aggregation and attribution among affiliated filers under beneficial ownership rules.
The Schedule 13G/A describes how Wexford Capital, Wexford GP, and two individuals may be deemed to beneficially own the same securities held by named Wexford Funds due to advisory/manager and partnership relationships.
The filing cites the calculation base of 48,170,647 shares from a Schedule 14A; the report includes the Investment Company Act carve-out language for fund shareholders and standard attribution disclaimers.
Key Figures
Shared voting/dispositive power:12,071,823 sharesPercent of class:25.06%Shares outstanding (basis):48,170,647 shares+2 more
5 metrics
Shared voting/dispositive power12,071,823 sharesReported shared voting and dispositive power by Wexford entities
Percent of class25.06%Calculated using shares outstanding as of <date>May 5, 2026</date>
Shares outstanding (basis)48,170,647 sharesShares outstanding used for percentage calculation as of <date>May 5, 2026</date>
CUSIP56155L108Identifiers for Mammoth Energy Common Stock
Filing amendment date06/22/2026Signatures dated in the amendment
Key Terms
beneficially own, shared dispositive power, Schedule 14A, Investment Company Act of 1940
4 terms
beneficially ownregulatory
"may be deemed to beneficially own the same securities named in Item 1"
Beneficially own means having the economic rights and risks of a security—such as the right to receive dividends, sell the shares, or profit from price changes—whether or not your name appears on the official share register. Think of it like renting a car: you use it and reap the benefits even if the title lists someone else. Investors care because beneficial ownership determines who truly controls value, must be disclosed under securities rules, and can signal potential influence or trading activity that affects a stock’s price.
shared dispositive powerregulatory
"Shared Dispositive Power 12,071,823.00"
Schedule 14Aregulatory
"as reported by the Issuer in the Schedule 14A filed by the Issuer"
Schedule 14A is a document that companies file with regulators to share important information with shareholders before a big vote, like approving a merger or election of directors. It matters because it helps investors understand what’s happening so they can make informed decisions about the company’s future.
Investment Company Act of 1940regulatory
"A listing of the shareholders of an investment company registered under the Investment Company Act of 1940"
A U.S. federal law that sets the rulebook for pooled investment vehicles such as mutual funds, exchange-traded funds and similar money managers, requiring them to register with regulators, disclose holdings and fees, limit conflicts of interest, and follow governance standards. It matters to investors because these protections and transparency rules act like a referee and scoreboard, helping people compare funds, trust that managers follow fair practices, and spot hidden costs or risks.
What stake does Wexford report in Mammoth Energy (TUSK)?
Wexford-affiliated reporting persons disclose shared ownership of 12,071,823 shares, representing 25.06% of the class using 48,170,647 shares outstanding as of May 5, 2026 as the basis for the calculation.
Who are the reporting persons in the Schedule 13G/A for TUSK?
The filing names Wexford Capital LP, Wexford GP LLC, Charles E. Davidson, and Joseph M. Jacobs as the Reporting Persons, each described with Delaware formation or U.S. citizenship and a shared voting/dispositive interest.
Does the filing state who can vote or dispose of the shares?
Yes; the Schedule 13G/A states that the Reporting Persons share the power to vote and to dispose of the reported 12,071,823 shares, indicating joint voting and dispositive authority over those shares.
On what basis was the percent ownership calculated in the filing?
The percent ownership (25.06%) is calculated using 48,170,647 shares outstanding as of May 5, 2026, as reported by Mammoth Energy in its Schedule 14A filed May 15, 2026.
Do the Reporting Persons claim direct beneficial ownership of the Wexford Funds' shares?
The filing includes explicit disclaimers: each Reporting Person disclaims beneficial ownership of the securities held by the Wexford Funds, except that Davidson and Jacobs may be deemed owners to the extent of their pecuniary interests.
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G
UNDER THE SECURITIES EXCHANGE ACT OF 1934
(Amendment No. 8)
Mammoth Energy Services, Inc.
(Name of Issuer)
Common Stock, $0.01 par value
(Title of Class of Securities)
56155L108
(CUSIP Number)
06/17/2026
(Date of Event Which Requires Filing of this Statement)
Check the appropriate box to designate the rule pursuant to which this Schedule is filed:
Rule 13d-1(b)
Rule 13d-1(c)
Rule 13d-1(d)
schemaVersion:
SCHEDULE 13G
CUSIP Number(s):
56155L108
1
Names of Reporting Persons
Wexford Capital LP
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
DELAWARE
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
0.00
6
Shared Voting Power
12,071,823.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
12,071,823.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
12,071,823.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
25.06 %
12
Type of Reporting Person (See Instructions)
PN
SCHEDULE 13G
CUSIP Number(s):
56155L108
1
Names of Reporting Persons
Wexford GP LLC
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
DELAWARE
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
0.00
6
Shared Voting Power
12,071,823.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
12,071,823.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
12,071,823.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
25.06 %
12
Type of Reporting Person (See Instructions)
OO
SCHEDULE 13G
CUSIP Number(s):
56155L108
1
Names of Reporting Persons
Charles E. Davidson
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
UNITED STATES
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
0.00
6
Shared Voting Power
12,071,823.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
12,071,823.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
12,071,823.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
25.06 %
12
Type of Reporting Person (See Instructions)
IN
SCHEDULE 13G
CUSIP Number(s):
56155L108
1
Names of Reporting Persons
Joseph M. Jacobs
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
UNITED STATES
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
0.00
6
Shared Voting Power
12,071,823.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
12,071,823.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
12,071,823.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
25.06 %
12
Type of Reporting Person (See Instructions)
IN
SCHEDULE 13G
Item 1.
(a)
Name of issuer:
Mammoth Energy Services, Inc.
(b)
Address of issuer's principal executive offices:
14201 Caliber Drive, Suite 300 Oklahoma City, Oklahoma 73134
Item 2.
(a)
Name of person filing:
Wexford Capital LP ("Wexford Capital"), Wexford GP LLC ("Wexford GP"), Charles E. Davidson ("Davidson") and Joseph M. Jacobs ("Jacobs", and together with Wexford Capital, Wexford GP and Davidson, the "Reporting Persons") are hereby jointly filing this Amendment No. 8 to the Schedule 13G filed on February 8, 2017, as amended, because such Reporting Persons may be deemed to beneficially own the same securities named in Item 1 by certain Wexford Funds (as defined below) due to certain affiliations among the Reporting Persons.
(b)
Address or principal business office or, if none, residence:
The address of the principal business office of the Reporting Persons is c/o Wexford Capital LP, 777 South Flagler Drive, Suite 602 East, West Palm Beach, FL 33401.
(c)
Citizenship:
Each of Wexford Capital and Wexford GP are formed in Delaware. Each of Davidson and Jacobs are United States citizens.
(d)
Title of class of securities:
Common Stock, $0.01 par value
(e)
CUSIP No.:
56155L108
Item 3.
If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)
Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)
Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)
Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)
Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)
An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)
An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)
A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)
A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)
A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)
A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J),
please specify the type of institution:
(k)
Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.
Ownership
(a)
Amount beneficially owned:
The information required by Item 4(a) is set forth in Row 9 of the cover page for each of the Reporting Persons and is incorporated herein by reference.
Wexford Capital may, by reason of its status as (i) sub-advisor of each of Wexford Spectrum Trading Limited ("WST") and Wexford Catalyst Trading Limited ("WCT") and (ii) investment manager of Wexford Focused Trading Limited ("WFT", and together with WST and WCT, the "Wexford Funds"), be deemed to own beneficially the securities held by the Wexford Funds. Wexford GP may, as the General Partner of Wexford Capital, be deemed to own beneficially the securities held by the Wexford Funds. Each of Davidson and Jacobs may, by reason of his status as a controlling person of Wexford GP, be deemed to own beneficially the securities held by the Wexford Funds. Each of Wexford Capital, Wexford GP, Davidson and Jacobs share the power to vote and to dispose of the securities beneficially owned by the Wexford Funds. Each of Wexford Capital, Wexford GP, Davidson and Jacobs disclaim beneficial ownership of the securities held by the Wexford Funds and this report shall not be deemed as an admission that they are the beneficial owners of such securities except, in the case of Davidson and Jacobs, to the extent of their respective pecuniary interests therein.
(b)
Percent of class:
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.
(c)
Number of shares as to which the person has:
(i) Sole power to vote or to direct the vote:
The information required by Item 4(c)(i) is set forth in Row 5 of the cover page for each of the Reporting Persons and is incorporated herein by reference.
(ii) Shared power to vote or to direct the vote:
The information required by Item 4(c)(ii) is set forth in Row 6 of the cover page for each of the Reporting Persons and is incorporated herein by reference.
(iii) Sole power to dispose or to direct the disposition of:
The information required by Item 4(c)(iii) is set forth in Row 7 of the cover page for each of the Reporting Persons and is incorporated herein by reference.
(iv) Shared power to dispose or to direct the disposition of:
The information required by Item 4(c)(iv) is set forth in Row 8 of the cover page for each of the Reporting Persons and is incorporated herein by reference.
Item 5.
Ownership of 5 Percent or Less of a Class.
Not Applicable
Item 6.
Ownership of more than 5 Percent on Behalf of Another Person.
If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required.
The Wexford Funds have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, the shares of Common Stock reported herein.
Item 7.
Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
Not Applicable
Item 8.
Identification and Classification of Members of the Group.
Not Applicable
Item 9.
Notice of Dissolution of Group.
Not Applicable
Item 10.
Certifications:
By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11.
SIGNATURE
After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.
Wexford Capital LP
Signature:
/s/ Mark E. Ahern
Name/Title:
By: Wexford GP LLC, its General Partner, By: Mark E. Ahern, Vice President and Assistant Secretary
Date:
06/22/2026
Wexford GP LLC
Signature:
/s/ Mark E. Ahern
Name/Title:
Mark E. Ahern, Vice President and Assistant Secretary
