William A. Zartler - Sep 9, 2025 Form 4 Insider Report for Solaris Energy Infrastructure, Inc. (SEI)

Role: CHAIRMAN AND CEO, Director, 10%+ Owner
Signature: /s/ Christopher M. Powell, Attorney-in-Fact
Stock symbol: SEI
Transactions as of: Sep 9, 2025
Transactions value $: $248,300
Form type: 4
Date filed: 9/9/2025, 04:18 PM
Previous filing: May 22, 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Zartler William A	CHAIRMAN AND CEO, Director, 10%+ Owner	9651 KATY FREEWAY, SUITE 300, HOUSTON	/s/ Christopher M. Powell, Attorney-in-Fact	2025-09-09	0001520378

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	SEI	Class A Common Stock	Purchase	$248K	+10K	+0.96%	$24.83	1.05M	Sep 9, 2025	Direct	F1, F2
holding	SEI	Class B Common Stock						727K	Sep 9, 2025	Direct	F3
holding	SEI	Class B Common Stock						3.51M	Sep 9, 2025	See Footnote	F3, F4

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						727K	Sep 9, 2025	Class A Common Stock	727K		Direct	F5
holding	SEI	Solaris Energy Infrastructure, LLC Units						3.51M	Sep 9, 2025	Class A Common Stock	3.51M		See Footnote	F4, F5

* 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 purchase price. These shares were purchased in multiple transactions at prices ranging from $24.80 to $24.84 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 450,381 shares of Class A common stock from 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	Represents shares held by Solaris Energy Capital. The Reporting Person is the sole member of Solaris Energy Capital and has the authority to vote or dispose of the shares held by Solaris Energy Capital in his sole discretion. The Reporting Person disclaims beneficial ownership of the shares held by Solaris Energy Capital in excess of his pecuniary interest therein.
F5	Subject to 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.