Mammoth Energy (NASDAQ: TUSK) director adds 5,500 shares in open-market buys

Rhea-AI Filing Summary

MAMMOTH ENERGY SERVICES, INC. director Arthur H. Amron reported open-market purchases of the company’s common stock. He bought 2,500 shares on May 26, 2026 at a price of $3.2399 per share and 3,000 shares on May 28, 2026 at $3.25 per share. After these transactions, he directly owns 62,635 shares of Mammoth Energy common stock. The reported prices reflect weighted average purchase prices for multiple trades within price ranges on the same days.

Insider Trade Summary

Net Buyer: 5,500 shares ($17,850)

Net Buy 2 txns

Insider Amron Arthur H

Role null

Bought 5,500 shs ($18K)

Type	Security	Shares	Price	Value
Purchase	Common Stock	3,000	$3.25	$10K
Purchase	Common Stock	2,500	$3.2399	$8K

Holdings After Transaction: Common Stock — 62,635 shares (Direct, null)

Footnotes (1)

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Key Figures

Shares purchased May 26, 2026: 2,500 shares Shares purchased May 28, 2026: 3,000 shares Total shares bought in this Form 4: 5,500 shares +3 more

6 metrics

Shares purchased May 26, 2026 2,500 shares Open-market purchase of Common Stock at $3.2399 per share

Shares purchased May 28, 2026 3,000 shares Open-market purchase of Common Stock at $3.25 per share

Total shares bought in this Form 4 5,500 shares Two open-market purchases of Common Stock

Ownership after transactions 62,635 shares Total Common Stock directly owned after May 28, 2026 trade

Purchase price May 26, 2026 $3.2399 per share Weighted average purchase price for Common Stock

Purchase price May 28, 2026 $3.25 per share Open-market purchase price for Common Stock

Key Terms

open-market purchase, weighted average purchase price, Common Stock

3 terms

open-market purchase financial

"transaction_action: "open-market purchase" for both Common Stock transactions"

An open-market purchase is when an investor or a company buys shares on a public stock exchange at the going market price, rather than through a private deal. It matters to investors because these purchases change how many shares are available, can push the stock price up or signal confidence from large buyers, and often affect per-share metrics like earnings—think of it like someone buying lots of apples off a grocery shelf, reducing supply and potentially raising the price.

weighted average purchase price financial

"The price reported in Column 4 is a weighted average purchase price."

The weighted average purchase price is the average cost per share you paid across multiple buys, calculated so larger purchases count more than smaller ones. Imagine buying apples at different prices: the overall price you effectively paid depends on how many apples you bought at each price. Investors use it to measure true cost basis, calculate gains or losses, decide when to sell, and manage taxes and portfolio performance.

Common Stock financial

"security_title: "Common Stock" for each reported transaction"

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

Form 4 Insider Transactions: What Each Field Means →

SEC Form 4

FORM 4

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

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Amron Arthur H

(Last) (First) (Middle)

14201 CALIBER DRIVE

SUITE 300

(Street)

OKLAHOMA CITY OKLAHOMA 73134

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
MAMMOTH ENERGY SERVICES, INC. [ TUSK ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/26/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	05/26/2026		P		2,500	A	$3.2399(1)	59,635	D
Common Stock	05/28/2026		P		3,000	A	$3.25(1)	62,635	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. The price reported in Column 4 is a weighted average purchase price. These shares were purchased in multiple transactions at prices within a range. The reporting person undertakes to provide to Mammoth Energy Services, Inc., any security holder of Mammoth Energy Services, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price.

Remarks:

	/s/ Arthur Amron	05/28/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

FAQ

What insider transactions did TUSK director Arthur H. Amron report?

Arthur H. Amron reported two open-market purchases of Mammoth Energy common stock. He bought 2,500 shares on May 26, 2026 and 3,000 shares on May 28, 2026, increasing his direct ownership position in the company.

How many Mammoth Energy (TUSK) shares did the director buy and at what prices?

Arthur H. Amron purchased 2,500 shares at $3.2399 per share on May 26, 2026 and 3,000 shares at $3.25 per share on May 28, 2026. Both were reported as open-market purchases of common stock.

What is Arthur H. Amron’s total Mammoth Energy (TUSK) shareholding after these trades?

Following the reported open-market purchases, Arthur H. Amron directly holds 62,635 shares of Mammoth Energy common stock. This figure reflects his position after buying 5,500 shares across two transactions in late May 2026.

Were the TUSK insider purchases made in the open market or through another method?

Both transactions were classified as open-market purchases of Mammoth Energy common stock. The Form 4 describes them with transaction code “P,” indicating purchases in the open market or private transactions at the reported weighted average prices.

What does the weighted average purchase price disclosure mean in the TUSK Form 4?

The filing notes that the reported prices are weighted average purchase prices across multiple trades within a price range. The reporting person states they will provide detailed trade-by-trade pricing information to Mammoth Energy, its security holders, or SEC staff upon request.