[Form 4] Solaris Oilfield Infrastructure, Inc. Insider Trading Activity

Rhea-AI Filing Summary

Insider purchase by the Chairman/CEO of Solaris Energy Infrastructure, Inc. The filing shows that William A. Zartler, who is Chairman, CEO, a director and a 10% owner, purchased 10,000 shares of Class A common stock on 09/09/2025 at a weighted average price of $24.83 per share. After the transaction he directly beneficially owns 1,049,227 shares of Class A common stock and directly owns 726,819 Class B shares plus indirectly 3,513,496 Class B shares through Solaris Energy Capital. The filing notes 450,381 Class A shares are restricted and subject to vesting. Solaris LLC units are exchangeable for Class A shares under the Solaris LLC Agreement.

Positive

• Insider purchase: Chairman/CEO acquired 10,000 Class A shares at a weighted average of $24.83, showing additional insider buying.
• Substantial insider ownership: Reporting person beneficially owns 1,049,227 Class A shares and large Class B holdings, indicating aligned management ownership.

Negative

• Small transaction size: 10,000 shares is modest relative to the reporting person’s total holdings and likely immaterial to valuation.
• Restricted shares: 450,381 Class A shares remain subject to vesting, limiting immediate liquidity of a portion of insider holdings.

Insights

Corporate Governance Expert

TL;DR: Chairman/CEO executed a small open-market purchase; ownership structure includes significant indirect holdings via affiliated entities.

The purchase of 10,000 Class A shares by the Chairman and CEO on 09/09/2025 at $24.83 is a routine open-market acquisition that modestly increases his direct economic exposure. The reporting person retains large existing stakes: over 1.0 million Class A shares including restricted awards and multi-million Class B holdings, some held indirectly through Solaris Energy Capital. The disclosure clarifies voting and pecuniary distinctions for Class B shares and provides customary disclaimers regarding indirect beneficial ownership. For governance, the mix of direct, restricted and indirect holdings consolidates control while reflecting standard executive compensation vesting schedules.

Securities Analyst

TL;DR: A leader bought a modest number of shares; transaction size is immaterial to market capitalization but signals continued insider participation.

The 10,000-share purchase at a weighted average of $24.80–$24.84 is small relative to the reporting person’s aggregate holdings (1,049,227 Class A beneficially owned after the trade plus Class B exposure). The filing discloses that 450,381 Class A shares remain subject to vesting, and that certain units are exchangeable into Class A shares, which could increase float over time. This Form 4 documents insider activity without indicating material changes to capital structure or control.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Zartler William A

(Last) (First) (Middle)

9651 KATY FREEWAY

SUITE 300

(Street)

HOUSTON TX 77024

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
Solaris Energy Infrastructure, Inc. [ SEI ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director	X	10% Owner
X	Officer (give title below)		Other (specify below)
	CHAIRMAN AND CEO

3. Date of Earliest Transaction (Month/Day/Year)
09/09/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Class A Common Stock	09/09/2025		P		10,000	A	$24.83(1)	1,049,227(2)	D
Class B Common Stock(3)								726,819	D
Class B Common Stock(3)								3,513,496	I	See Footnote(4)

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Solaris Energy Infrastructure, LLC Units	(5)							(5)	(5)	Class A Common Stock	726,819		726,819	D
Solaris Energy Infrastructure, LLC Units	(5)							(5)	(5)	Class A Common Stock	3,513,496		3,513,496	I	See Footnote(4)

Explanation of Responses:

1. 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.

2. Includes 450,381 shares of Class A common stock from previously granted Restricted Stock Awards that remain subject to vesting.

3. 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.

4. 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.

5. 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.

	/s/ Christopher M. Powell, Attorney-in-Fact	09/09/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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FAQ

What did William A. Zartler disclose in the Form 4 for Solaris Energy Infrastructure, Inc. (SEI)?

The Form 4 reports that William A. Zartler purchased 10,000 Class A shares on 09/09/2025 at a weighted average price of $24.83 per share and beneficially owns 1,049,227 Class A shares after the transaction.

How much Class B stock does the reporting person hold according to the filing?

The filing shows the reporting person directly holds 726,819 Class B shares and indirectly holds 3,513,496 Class B shares through Solaris Energy Capital.

Are any of the reported Class A shares restricted or unvested?

Yes. The filing states that 450,381 Class A shares come from previously granted Restricted Stock Awards that remain subject to vesting.

What is the relationship between Solaris LLC Units and Class A shares?

The filing notes that Solaris LLC Units, together with corresponding Class B shares, are exchangeable from time to time for Class A common stock under the Solaris LLC Agreement.

Who signed the Form 4 and when was it signed?

The Form 4 was signed by Christopher M. Powell, Attorney-in-Fact on 09/09/2025.