Cactus (WHD) director O’Donnell receives 2,559 RSUs and 2,524 units vest into stock

Rhea-AI Filing Summary

Cactus, Inc. director John A. O’Donnell reported equity compensation activity. On March 10, 2026, he received 2,559 restricted stock units (RSUs), which vest on the first anniversary of the grant date.

RSUs granted on March 10, 2025 totaling 2,524 units vested and were converted into the same number of Class A common shares. Following these transactions, he holds 27,990 shares of Class A common stock directly and 5,083 RSUs representing additional contingent rights to shares.

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

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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^*

ODONNELL JOHN A

(Last) (First) (Middle)

920 MEMORIAL CITY WAY

SUITE 300

(Street)

HOUSTON TX 77024

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
Cactus, Inc. [ WHD ]

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

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

3. Date of Earliest Transaction (Month/Day/Year)
03/10/2026

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

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

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

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
Class A Common Stock	03/10/2026		M		2,524	A	(1)	27,990	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
Restricted Stock Units	(1)	03/10/2026		A		2,559		(2)	(2)	Class A Common Stock	2,559	$0	5,083	D
Restricted Stock Units	(1)	03/10/2026		M			2,524	(3)	(3)	Class A Common Stock	2,524	$0	2,559	D

Explanation of Responses:

1. Restricted stock units represent a contingent right to receive Class A common stock. Upon vesting, one share of Class A common stock will be delivered for each vested restricted stock unit.

2. On March 10, 2026, the reporting person was granted 2,559 restricted stock units, vesting on the first anniversary of the grant date.

3. On March 10, 2025, the reporting person was granted 2,524 restricted stock units, vesting on the first anniversary of the grant date.

Remarks:

	/s/ John A O'Donnell, by William Marsh as Attorney-in-Fact	03/12/2026
	** 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.

FAQ

What insider transactions did Cactus (WHD) director John A. O’Donnell report?

John A. O’Donnell reported equity compensation transactions involving restricted stock units, not open-market trades. A new grant of 2,559 RSUs was awarded, and a prior grant of 2,524 RSUs vested and converted into an equal number of Class A common shares.

How many new restricted stock units did O’Donnell receive from Cactus (WHD)?

O’Donnell received a new grant of 2,559 restricted stock units on March 10, 2026. These RSUs represent a contingent right to receive Class A common stock, with one share delivered for each unit when they vest on the first anniversary of the grant date.

What happened to the restricted stock units granted to O’Donnell in March 2025 at Cactus (WHD)?

The 2,524 RSUs granted on March 10, 2025 vested on their first anniversary. Upon vesting, they were converted into 2,524 shares of Cactus Class A common stock, increasing O’Donnell’s direct share ownership without any reported open-market sale or purchase.

How many Cactus (WHD) Class A common shares does O’Donnell own after these transactions?

After the reported transactions, O’Donnell directly holds 27,990 shares of Cactus Class A common stock. In addition, he holds 5,083 restricted stock units, which are contingent rights to receive an equal number of shares upon future vesting events, subject to grant terms.

Are O’Donnell’s recent Cactus (WHD) Form 4 transactions open-market buys or sales?

The reported Form 4 activity reflects equity compensation, not open-market buys or sales. It includes a grant of 2,559 RSUs and the vesting and conversion of 2,524 RSUs into Class A common shares, all at a reported price per share of $0.00 in the filing.