Cynthia M. Durrett - 01 Mar 2026 Form 4 Insider Report for Solaris Energy Infrastructure, Inc. (SEI)

Role: Chief Administrative Officer, Director
Signature: /s/ Christopher M. Powell, Attorney-in-Fact
Issuer symbol: SEI
Transactions as of: 01 Mar 2026
Net transactions value: -$1,337,032
Form type: 4
Filing time: 03 Mar 2026, 17:52:44 UTC
Previous filing: 18 Dec 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Durrett Cynthia M.	Chief Administrative Officer, Director	9651 KATY FREEWAY, SUITE 300, HOUSTON	/s/ Christopher M. Powell, Attorney-in-Fact	03 Mar 2026	0001705383

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	SEI	Class A Common Stock	Award	$0	+21,444	+16%	$0.000000	152,596	01 Mar 2026	Direct	F1
transaction	SEI	Class A Common Stock	Award	$0	+28,871	+19%	$0.000000	181,467	01 Mar 2026	Direct	F2
transaction	SEI	Class A Common Stock	Tax liability	$1,337,032	-26,940	-15%	$49.63	154,527	01 Mar 2026	Direct	F3, F4
holding	SEI	Class B Common Stock						165,038	01 Mar 2026	Direct	F5

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
holding	SEI	Solaris Energy Infrastructure, LLC Units						165,038	01 Mar 2026	Class A Common Stock	165,038		Direct	F6

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	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.
F2	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.
F3	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.
F4	Includes 63,581 shares of Class A common stock subject to previously granted Restricted Stock Awards that remain subject to vesting.
F5	Each share of Class B common stock has no economic rights but entitles the holder to one vote on all matters to be voted on by the stockholders generally.
F6	Subject to the terms of the Solaris LLC Agreement, the Solaris LLC Units (together with a corresponding number of shares of Class B common stock) are exchangeable from time to time for shares of Class A common stock of the Issuer.