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TUSK · Additional Proxy Materials (DEFA14A) · Filed May 15, 2026

Mammoth Energy Services Inc — Additional Proxy Materials (DEFA14A)

Form
DEFA14A
Filed
May 15, 2026
Ticker
TUSK
Accession
0001628280-26-035590
Mammoth Energy Services Inc on Boardroom AlphaView on SEC EDGAR
Boardroom Alpha · Filing insights

Mammoth Energy Services, Inc. has no substantive developments. Consult the filing for more details.

About Mammoth Energy Services Inc
Market cap
$171M
1Y TSR
+8.8%
3Y TSR
−11.3%
Board grade
C+
Sector
Industrials
CEO
Bernard Lancaster
Last annual meeting: Jun 25, 2026 · View full Mammoth Energy Services Inc profile →
Document

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of the
Securities Exchange Act of 1934


ý    Filed by Registrant

Check the appropriate box
¨    Preliminary Proxy Statement
¨    Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))
¨    Definitive Proxy Statement
ý    Definitive Additional Materials
¨    Soliciting Material under § 240.14a-12


Mammoth Energy Services, Inc.

(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than Registrant)

Payment of Filing Fee (Check the appropriate box):
ý    No fee required

¨    Fee paid previously with written preliminary materials

¨    Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11




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Reference

Frequently asked questions

When did Mammoth Energy Services Inc file this DEFA14A?
Mammoth Energy Services Inc (TUSK) filed this Additional Proxy Materials (DEFA14A) with the SEC on May 15, 2026. The accession number assigned by EDGAR is 0001628280-26-035590.
What does a DEFA14A disclose?
DEFA14A is additional definitive proxy soliciting material filed in connection with a shareholder meeting — supplemental letters, slides, or amendments issued after the main proxy statement.
What is the key takeaway from this filing?
Mammoth Energy Services, Inc. has no substantive developments. Consult the filing for more details. This is Boardroom Alpha's one-line summary of the additional proxy materials; see the full filing text above for the formal disclosure.
Where can I find Mammoth Energy Services Inc's prior proxy statements on EDGAR?
The SEC EDGAR browser lists every DEFA14A Mammoth Energy Services Inc has filed under CIK 1679268, sortable by date. Use the "View on SEC EDGAR" link in the page header, or browse directly via https://www.sec.gov/cgi-bin/browse-edgar.
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