Cynthia M. Durrett - 17 Dec 2025 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: 17 Dec 2025
Net transactions value: -$2,097,631
Form type: 4
Filing time: 18 Dec 2025, 16:05:03 UTC
Previous filing: 04 Mar 2025
Next filing: 03 Mar 2026
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	18 Dec 2025	0001705383

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	SEI	Class A Common Stock	Sale	$2,097,631	-47,011	-26%	$44.62	131,152	17 Dec 2025	Direct	F1, F2
holding	SEI	Class B Common Stock						165,038	17 Dec 2025	Direct	F3

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	17 Dec 2025	Class A Common Stock	165,038		Direct	F4

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

Explanation of Responses:

Id	Content
F1	The reported price in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $44.21 to $45.47 per share. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the U.S. Securities and Exchange Commission (the "SEC"), upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.
F2	Includes 86,929 shares of Class A common stock subject to previously granted Restricted Stock Awards that remain subject to vesting.
F3	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.
F4	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.