W. Howard Keenan JR - Aug 23, 2025 Form 4 Insider Report for Solaris Energy Infrastructure, Inc. (SEI)

Role: Director
Signature: /s/ Christopher M. Powell, Attorney-in-Fact
Stock symbol: SEI
Transactions as of: Aug 23, 2025
Transactions value $: $0
Form type: 4
Date filed: 8/26/2025, 04:30 PM
Previous filing: Jul 14, 2025
Next filing: Oct 14, 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Keenan W Howard JR	Director	410 PARK AVENUE, 20TH FLOOR, NEW YORK	/s/ Christopher M. Powell, Attorney-in-Fact	2025-08-26	0001370287

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	SEI	Class A Common Stock	Award	$0	+5.52K	+6.61%	$0.00	89.1K	Aug 23, 2025	Direct	F1, F2
holding	SEI	Class B Common Stock						7.08M	Aug 23, 2025	See Footnote	F3, F4, 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						7.08M	Aug 23, 2025	Class A Common Stock	7.08M		See Footnote	F5, F6

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

Explanation of Responses:

Id	Content
F1	Restricted Stock Award pursuant to the Solaris Energy Infrastructure, Inc. Long Term Incentive Plan. The award vests in full on the first anniversary of the grant date.
F2	Includes 5,518 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 its holder to one vote on all matters to be voted on by stockholders generally.
F4	The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and this report shall not be deemed an admission that the reporting person is the beneficial owner of the securities for Section 16 or any other purpose.
F5	These securities are owned directly by Yorktown Energy Partners X, L.P., a Delaware limited partnership ("Yorktown X"). The reporting person is a member and manager of Yorktown X Associates LLC, the general partner of Yorktown X Company LP, the general partner of Yorktown X.
F6	Subject to the terms of the Second Amended and Restated Limited Liability Company Agreement of Solaris Energy Infrastructure, LLC ("Solaris LLC"), dated as of May 11, 2017, as amended from time to time, included as Exhibit 10.1 to the Issuer's Current Report on Form 8-K filed with the U.S. Securities and Exchange Commission on May 17, 2017, the units in Solaris LLC (together with a corresponding number of shares of the Issuer's Class B common stock) are exchangeable from time to time for shares of the Issuer's Class A common stock.