UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of

of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): ~~April~~May 245, 2026

SOLARIS ENERGY INFRASTRUCTURE, INC.

(Exact name of registrant as specified in its charter)

Delaware

001-38090

81-5223109

(State or other jurisdiction

of incorporation)

(Commission

File Number)

(IRS Employer

Identification No.)

9651 Katy Freeway, Suite 300

Houston, Texas 77024

(Address of principal executive offices)

(Zip Code)

(281) 501-3070

(Registrant’s telephone number, including area code)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐	Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐	Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐	Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐	Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Class A Common Stock, $0.01 par value	“SEI”	New York Stock Exchange
		Indicate by check NYSE Texas, Inc.
Indicate by check mark		NYSE Texas, Inc.

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). Emerging growth company ☐

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 87.01. ~~Other~~Regulation ~~Events~~FD Disclosure.

On ~~April~~May 245, 2026, ~~a wholly owned subsidiary of~~ Solaris Energy Infrastructure, Inc. ~~entered~~(the ~~into~~“Company”) anannounced ~~agreement~~that, subject to ~~provide~~market ~~over~~conditions, ~~600~~Solaris MWEnergy ofInfrastructure, ~~power~~LLC ~~capacity~~(the “Issuer”), ~~including~~a ~~balance~~subsidiary of ~~plant~~the ~~scope~~Company, intends to aoffer ~~new~~for ~~customer~~sale ~~that~~$1.3 billion isaggregate anprincipal ~~affiliate~~amount of anSenior ~~investment-grade~~Notes ~~technology~~due ~~company~~2031 ~~for~~(the “Notes”) in a ~~term~~private placement (the “Offering”) conducted pursuant to Rule 144A and Regulation S under the Securities Act of 101933, ~~years~~as amended (the “Securities Act”). In connection with the Offering, ~~beginning~~the Company is providing certain information regarding the Company to prospective investors in ~~late~~a preliminary offering memorandum, dated May 5, 2026, and ~~scaling~~such ~~through~~information ~~2028~~is furnished as Exhibit 99.1 hereto. The Issuer intends to use the net proceeds from the Offering to repay the Company’s outstanding borrowings, to pay related fees and expenses and for general corporate purposes, including to fund growth capital expenditures.

In accordance with General Instruction B.2 of Form 8-K, the information contained in this Current Report on Form 8-K under this Item 7.01 and set forth in Exhibit 99.1 hereto shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall such information be deemed incorporated by reference into any filing under the Securities Act or the Exchange Act, except as expressly set forth by specific referencing in such filing.

Item 8.01.

Other Events.

The Company is filing as Exhibit 99.2 hereto a press release issued on May 5, 2026 announcing the Offering. The contents of such press release are incorporated by reference in this Item 8.01.

This Current Report on Form 8-K, including Exhibits 99.1 and 99.2 hereto, is not an offer to sell or a solicitation of an offer to buy any securities, nor shall there be any sales of securities in any jurisdiction in which such offer, solicitation or sale would be unlawful. The Notes will not be registered under the Securities Act or any state securities law and may not be offered or sold in the United States absent registration or an applicable exemption from registration under the Securities Act and applicable state securities laws.

Item 9.01.

Financial Statements and Exhibits.

(d)

Exhibits.


Exhibit Number		Description

99.1		Certain information being provided to potential investors in the Offering.

99.2		Press Release dated May 5, 2026.

104		Cover Page Interactive Data File (formatted as inline XBRL).

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Date: ~~April~~May 285, 2026

SOLARIS ENERGY INFRASTRUCTURE, INC. By: /s/ ~~Stephan~~STEPHAN E. ~~Tompsett~~TOMPSETT Name: Stephan E. Tompsett Title: Chief Financial Officer

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