Solaris Energy (SEI) legal chief logs stock awards and tax share withholding

Rhea-AI Filing Summary

Solaris Energy Infrastructure, Inc. Chief Legal Officer Christopher M. Powell reported equity compensation transactions in Class A common stock. On March 1, 2026, he acquired 18,165 shares as a restricted stock award and 29,723 shares from performance-based restricted stock units, both at a price of $0.00 per share under the company’s Long Term Incentive Plan.

On the same date, 27,534 shares were disposed of at $49.63 per share, representing shares withheld by the company to cover tax obligations tied to the vesting of restricted and performance-based awards. After these transactions, Powell directly owned 150,969 shares of Class A common stock, including 58,447 shares that remain subject to future vesting.

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

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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^*

Powell Christopher M

(Last) (First) (Middle)

9651 KATY FREEWAY

SUITE 300

(Street)

HOUSTON TX 77024

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
Solaris Energy Infrastructure, Inc. [ SEI ]

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

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

3. Date of Earliest Transaction (Month/Day/Year)
03/01/2026

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	03/01/2026		A		18,165(1)	A	$0	148,780	D
Class A Common Stock	03/01/2026		A		29,723(2)	A	$0	178,503	D
Class A Common Stock	03/01/2026		F		27,534(3)	D	$49.63	150,969(4)	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. Restricted Stock Award granted pursuant to the Solaris Energy Infrastructure, Inc. Long Term Incentive Plan on the date indicated. The award vests in three equal installments on the first three anniversaries of the grant date.

2. Reflects the vesting and settlement of shares that relate to multiple Performance-Based Restricted Stock Unit (PSU) awards granted pursuant to the Solaris Energy Infrastructure, Inc. Long Term Incentive Plan. The PSUs which were originally granted on March 1, 2023, March 1, 2024 and March 1, 2025 vested and were settled based on the Issuer's level of achievement with respect to the applicable performance goals.

3. Represents shares withheld by the Company to satisfy tax withholding obligations upon the vesting of previously granted Restricted Stock Awards and Performance-Based Restricted Stock Awards.

4. Includes 58,447 shares of Class A common stock subject to previously granted Restricted Stock Awards that remain subject to vesting.

Remarks:

	/s/ Christopher M. Powell	03/03/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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FAQ

What insider transactions did SEI’s Chief Legal Officer report on this Form 4?

SEI’s Chief Legal Officer Christopher M. Powell reported equity compensation activity, including restricted stock and performance-based award vesting, plus share withholding for taxes. These are non-cash compensation and tax events, not open-market stock purchases or sales, and reflect updates to his direct ownership position.

How many Solaris Energy Infrastructure (SEI) shares did the insider acquire?

Christopher M. Powell acquired 18,165 restricted shares and 29,723 shares from performance-based restricted stock units on March 1, 2026. Both grants were made at $0.00 per share under the Solaris Energy Infrastructure, Inc. Long Term Incentive Plan as part of his equity compensation.

Why were some SEI shares disposed of in this Form 4 filing?

The Form 4 shows 27,534 shares of SEI Class A common stock disposed of at $49.63 per share. These shares were withheld by the company solely to satisfy tax withholding obligations arising from the vesting of previously granted restricted and performance-based stock awards, not open-market selling.

What is the vesting schedule for the new SEI restricted stock award?

The new restricted stock award of 18,165 SEI shares vests in three equal installments. The installments occur on each of the first three anniversaries of the March 1, 2026 grant date, subject to the terms and conditions of the Solaris Energy Infrastructure, Inc. Long Term Incentive Plan.

How were the performance-based SEI stock units determined and settled?

The 29,723 SEI shares reflect vesting and settlement of multiple performance-based restricted stock unit awards granted in 2023, 2024, and 2025. These performance-based units vested and settled based on Solaris Energy Infrastructure, Inc.’s achievement of specified performance goals under its Long Term Incentive Plan.

What is the Chief Legal Officer’s SEI share ownership after these transactions?

Following these transactions, Christopher M. Powell directly owns 150,969 shares of SEI Class A common stock. This amount includes 58,447 shares subject to previously granted restricted stock awards that are still unvested and will vest in the future under the plan’s terms.