William A. Zartler - 01 Mar 2026 Form 4 Insider Report for Solaris Energy Infrastructure, Inc. (SEI)

Role: Chairman and Co-CEO, Director, 10%+ Owner
Signature: /s/ Christopher M. Powell, Attorney-in-Fact
Issuer symbol: SEI
Transactions as of: 01 Mar 2026
Net transactions value: $0
Form type: 4
Filing time: 03 Mar 2026, 17:43:05 UTC
Previous filing: 15 Oct 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Zartler William A	Chairman and Co-CEO, Director, 10%+ Owner	9651 KATY FREEWAY, SUITE 300, HOUSTON	/s/ Christopher M. Powell, Attorney-in-Fact	03 Mar 2026	0001520378

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	SEI	Class A Common Stock	Award	$0	+150,000	+14%	$0.000000	1,199,227	01 Mar 2026	Direct	F1
transaction	SEI	Class A Common Stock	Award	$0	+115,656	+9.6%	$0.000000	1,314,883	01 Mar 2026	Direct	F2, F3
holding	SEI	Class B Common Stock						726,819	01 Mar 2026	Direct	F4
holding	SEI	Class B Common Stock						3,513,496	01 Mar 2026	See Footnote	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						726,819	01 Mar 2026	Class A Common Stock	726,819		Direct	F6
holding	SEI	Solaris Energy Infrastructure, LLC Units						3,513,496	01 Mar 2026	Class A Common Stock	3,513,496		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 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	Includes 387,755 shares of Class A common stock subject to previously granted Restricted Stock Awards that remain subject to vesting.
F4	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.
F5	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.
F6	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.