William Zartler discloses 10% Solaris Energy (SEI) stake via Class A and B shares

Rhea-AI Filing Summary

Solaris Energy Infrastructure, Inc. received an updated ownership report from William A. Zartler on a Schedule 13G/A amendment. Zartler reports beneficial ownership of 5,289,542 shares of Solaris common stock, representing 10.0% of the Class A common stock on an as-converted basis.

The filing explains that he directly holds 1,049,227 shares of Class A common stock, including 450,381 restricted shares, and 726,819 shares of Class B common stock. He also indirectly holds 3,513,496 shares of Class B common stock through Solaris Energy Capital, LLC, where he is the sole member with sole voting and dispositive power. Class B shares are exchangeable into Class A shares on a one-for-one basis.

FAQ

What does the Schedule 13G/A filing reveal about SEI ownership?

The filing shows that William A. Zartler beneficially owns 5,289,542 shares of Solaris Energy Infrastructure stock, representing 10.0% of the Class A common stock on an as-converted basis, combining direct and indirect holdings.

How many Solaris Energy Infrastructure (SEI) shares does William A. Zartler hold directly?

Zartler directly holds 1,049,227 shares of Class A common stock, which includes 450,381 shares of restricted stock, plus 726,819 shares of Class B common stock, all under his sole voting and dispositive power according to the filing.

What indirect Solaris Energy Infrastructure (SEI) stake does Solaris Energy Capital, LLC hold?

The filing states that Solaris Energy Capital, LLC holds 3,513,496 shares of Class B common stock. William A. Zartler is the sole member of this LLC and has authority to vote or dispose of these shares at his sole discretion.

What percentage of Solaris Energy Infrastructure (SEI) does Zartler beneficially own?

Zartler reports beneficial ownership of 10.0% of Solaris Energy Infrastructure’s Class A common stock. This percentage is based on 48,802,385 Class A shares outstanding plus his directly and indirectly held Class B shares on an as-converted basis.

How are Solaris Energy Infrastructure (SEI) Class B shares treated in this ownership calculation?

The filing explains that each Class B common share is exchangeable for one Class A common share. Zartler’s Class B holdings, both direct and through Solaris Energy Capital, LLC, are included on this one-for-one, as-converted basis for the 10.0% figure.

What is the event date and amendment number for this SEI Schedule 13G/A?

The document is labeled Amendment No. 8 to a Schedule 13G. It relates to an event dated 12/31/2025 and updates William A. Zartler’s beneficial ownership information for Solaris Energy Infrastructure, Inc.

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Accepted by SEC EDGAR 02/13/2026 - 04:01 PM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 8)

Solaris Energy Infrastructure, Inc.

(Name of Issuer)

Class A Common Stock, par value $0.01 per share

(Title of Class of Securities)

83418M103

(CUSIP Number)

12/31/2025

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

SCHEDULE 13G

CUSIP No. 83418M103

1

Names of Reporting Persons

William A. Zartler

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 5,289,542.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 5,289,542.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

5,289,542.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

10.0 %

12

Type of Reporting Person (See Instructions)

IN

Comment for Type of Reporting Person: Mr. Zartler is the beneficial owner of 5,289,542 shares of common stock of the Issuer. Mr. Zartler holds a direct interest in 1,049,227 shares of Class A common stock (which includes 450,381 shares of restricted stock) and 726,819 shares of Class B common stock. Mr. Zartler also holds an indirect interest in 3,513,496 shares of Class B common stock through Solaris Energy Capital, LLC. Mr. Zartler is the sole member of Solaris Energy Capital, LLC and has the authority to vote or dispose of the shares held by Solaris Energy Capital, LLC in his sole discretion. Shares of the Issuer's Class B common stock are exchangeable for shares of Class A common stock on a one-for-one basis. The percent of class represented in row (11) is based on 48,802,385 shares of Class A common stock of the Issuer issued and outstanding as of October 31, 2025 as reported in the Issuer's Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on November 6, 2025, the 726,819 shares of Class B common stock directly held by Mr. Zartler and the 3,513,496 shares of Class B common stock indirectly held by Mr. Zartler through Solaris Energy Capital, LLC.

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Solaris Energy Infrastructure, Inc.
(b)	Address of issuer's principal executive offices: 9651 Katy Freeway Suite 300, Houston, Texas 77024
Item 2.
(a)	Name of person filing: William A. Zartler
(b)	Address or principal business office or, if none, residence: 9651 Katy Freeway Suite 300, Houston, Texas 77024
(c)	Citizenship: William A. Zartler is a citizen of the United States of America
(d)	Title of class of securities: Class A Common Stock, par value $0.01 per share
(e)	CUSIP No.: 83418M103
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: 5,289,542
(b)	Percent of class: 10.0 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 5,289,542
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 5,289,542
	(iv) Shared power to dispose or to direct the disposition of: 0
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	Not Applicable
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	Not Applicable
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.	Certifications:
	Not Applicable

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

William A. Zartler

Signature:	/s/ William A. Zartler
Name/Title:	William A. Zartler
Date:	02/13/2026