[SCHEDULE 13G/A] Solaris Energy Infrastructure, Inc. SEC Filing

Rhea-AI Filing Summary

Solaris Energy Infrastructure (SEI): Amendment No. 3 to Schedule 13G reports that Summit Partners-affiliated entities collectively beneficially own 1,796,310 shares of Class A common stock, representing 4.03% of the class. The group reports 0 shares with sole voting or dispositive power, shared voting power over 1,672,595 shares, and shared dispositive power over 1,796,310 shares.

The filing is made on a passive basis, with the certification stating the securities were not acquired to change or influence control. Ownership percentages were calculated against 44,603,740 shares outstanding as of June 30, 2025, and the event date is September 30, 2025. Item 5 indicates ownership of 5 percent or less of the class.

Insights

Securities law analyst

Passive 13G/A shows 4.03% stake below the 5% threshold.

Summit Partners and affiliates report beneficial ownership of 1,796,310 shares (4.03%) of Solaris Energy Infrastructure. Reported powers show shared voting over 1,672,595 shares and shared dispositive power over 1,796,310 shares, with no sole powers.

This amendment is filed under the passive investor framework, with a certification that the holdings are not for changing or influencing control. The percentage is based on 44,603,740 shares outstanding as of June 30, 2025, and the event date is September 30, 2025.

As a Schedule 13G/A, this is administrative and does not by itself signal transactions or strategic intent. Actual impact depends on future ownership changes disclosed in subsequent filings.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 3)

SOLARIS ENERGY INFRASTRUCTURE, INC.

(Name of Issuer)

Class A Common Stock, $0.01 par value

(Title of Class of Securities)

83418M103

(CUSIP Number)

09/30/2025

(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

Summit Partners Public Asset Management, LLC

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

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 1,672,595.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,796,310.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,796,310.00

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)

4.03 %

12

Type of Reporting Person (See Instructions)

IA

SCHEDULE 13G

CUSIP No. 83418M103

1

Names of Reporting Persons

Summit Partners, L.P.

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

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 1,672,595.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,672,595.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,672,595.00

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)

3.75 %

12

Type of Reporting Person (See Instructions)

PN

SCHEDULE 13G

CUSIP No. 83418M103

1

Names of Reporting Persons

Summit Partners Concentrated Growth L/S Master Fund, L.P.

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

CAYMAN ISLANDS

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 127,585.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 127,585.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

127,585.00

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)

0.29 %

12

Type of Reporting Person (See Instructions)

PN

SCHEDULE 13G

CUSIP No. 83418M103

1

Names of Reporting Persons

Summit Partners Technology L/S Master Fund, L.P.

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

CAYMAN ISLANDS

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 118,271.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 118,271.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

118,271.00

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)

0.27 %

12

Type of Reporting Person (See Instructions)

PN

SCHEDULE 13G

CUSIP No. 83418M103

1

Names of Reporting Persons

Summit Partners Sustainable Opportunities L/S Fund Limited

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

CAYMAN ISLANDS

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 569,560.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 569,560.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

569,560.00

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)

1.28 %

12

Type of Reporting Person (See Instructions)

PN

SCHEDULE 13G

CUSIP No. 83418M103

1

Names of Reporting Persons

Summit Partners Sustainable Opportunities L/S QP Fund, L.P.

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

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 835,321.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 835,321.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

835,321.00

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)

1.87 %

12

Type of Reporting Person (See Instructions)

PN

SCHEDULE 13G

CUSIP No. 83418M103

1

Names of Reporting Persons

Summit Partners Sustainable Opportunities L/S Fund, L.P.

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

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 21,858.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 21,858.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

21,858.00

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)

.05 %

12

Type of Reporting Person (See Instructions)

PN

SCHEDULE 13G

CUSIP No. 83418M103

1

Names of Reporting Persons

Summit Partners Alydar GP, L.P.

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

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 1,103,035.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,103,035.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,103,035.00

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)

2.47 %

12

Type of Reporting Person (See Instructions)

PN

SCHEDULE 13G

CUSIP No. 83418M103

1

Names of Reporting Persons

Summit Partners Alydar GP, LLC

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

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 1,103,035.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,103,035.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,103,035.00

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)

2.47 %

12

Type of Reporting Person (See Instructions)

CO

SCHEDULE 13G

CUSIP No. 83418M103

1

Names of Reporting Persons

Philip Furse

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 0.00
6	Shared Voting Power 1,672,595.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,796,310.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,796,310.00

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)

4.03 %

12

Type of Reporting Person (See Instructions)

IN

SCHEDULE 13G

CUSIP No. 83418M103

1

Names of Reporting Persons

Timothy Albright

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 0.00
6	Shared Voting Power 1,672,595.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,796,310.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,796,310.00

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)

4.03 %

12

Type of Reporting Person (See Instructions)

IN

SCHEDULE 13G

CUSIP No. 83418M103

1

Names of Reporting Persons

Robert MacAulay

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 0.00
6	Shared Voting Power 1,672,595.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,796,310.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,796,310.00

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)

4.03 %

12

Type of Reporting Person (See Instructions)

IN

SCHEDULE 13G

CUSIP No. 83418M103

1

Names of Reporting Persons

Matthew Curtis

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 0.00
6	Shared Voting Power 1,672,595.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,796,310.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,796,310.00

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)

4.03 %

12

Type of Reporting Person (See Instructions)

IN

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: The names of the persons filing this report (each a "Reporting Person" and collectively, the "Reporting Persons") are: (i) Summit Partners Public Asset Management, LLC ("SPPAM"), (ii) Summit Partners, L.P. ("SP"), (iii) Summit Partners Concentrated Growth L/S Master Fund, L.P. ("Summit Concentrated Growth"), (iv) Summit Partners Technology L/S Master Fund, L.P. ("Summit Technology"), (v) Summit Partners Sustainable Opportunities L/S Fund Limited ("SPSO Limited"), (vi) Summit Partners Sustainable Opportunities L/S QP Fund, L.P. ("SPSO QP"), (vii) Summit Partners Sustainable Opportunities L/S Fund, L.P. ("SPSO LP"), (viii) Summit Partners Alydar GP, L.P. ("Fund GP"), (ix) Summit Partners Alydar GP, LLC ("GP"), (x) Philip Furse, (xi) Timothy Albright, (xii) Robert MacAulay and (xiii) Matthew Curtis. The Reporting Persons have entered into a Joint Filing Agreement, dated November 14, 2025, a copy of which is incorporated by reference as Exhibit A to this statement, pursuant to which the Reporting Persons agreed to file this Schedule 13G and any amendments hereto jointly in accordance with the provisions of Rule 13d-1(k)(1) under the Act.
(b)	Address or principal business office or, if none, residence: The address of the principal business office or registered office, as applicable, of SPPAM, SP, SPSO QP, SPSO LP, Fund GP, GP, Philip Furse, Timothy Albright, Robert MacAulay and Matthew Curtis is 222 Berkeley Street, 18th Floor, Boston, MA 02116. The registered office address of Summit Concentrated Growth, Summit Technology and SPSO Limited is c/o Walkers Corporate Limited, 190 Elgin Avenue, George Town, Grand Cayman KY1-9008, Cayman Islands.
(c)	Citizenship: See responses to Item 4 on each cover page.
(d)	Title of class of securities: Class A Common Stock, $0.01 par value
(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: 1796310
(b)	Percent of class: 4.03%
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 0
	(ii) Shared power to vote or to direct the vote: 1672595
	(iii) Sole power to dispose or to direct the disposition of: 0
	(iv) Shared power to dispose or to direct the disposition of: 1796310
Item 5.	Ownership of 5 Percent or Less of a Class.
	Ownership of 5 percent or less of a class
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:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11.

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.

Summit Partners Public Asset Management, LLC

Signature:	Adam H. Hennessey
Name/Title:	Adam H. Hennessey, Authorized Person
Date:	11/14/2025

Summit Partners, L.P.

Signature:	Adam H. Hennessey
Name/Title:	Adam H. Hennessey, Authorized Person
Date:	11/14/2025

Summit Partners Concentrated Growth L/S Master Fund, L.P.

Signature:	Adam H. Hennessey
Name/Title:	Adam H. Hennessey, Authorized Person
Date:	11/14/2025

Summit Partners Technology L/S Master Fund, L.P.

Signature:	Adam H. Hennessey
Name/Title:	Adam H. Hennessey, Authorized Person
Date:	11/14/2025

Summit Partners Sustainable Opportunities L/S Fund Limited

Signature:	Adam H. Hennessey
Name/Title:	Adam H. Hennessey, Authorized Person
Date:	11/14/2025

Summit Partners Sustainable Opportunities L/S QP Fund, L.P.

Signature:	Adam H. Hennessey
Name/Title:	Adam H. Hennessey, Authorized Person
Date:	11/14/2025

Summit Partners Sustainable Opportunities L/S Fund, L.P.

Signature:	Adam H. Hennessey
Name/Title:	Adam H. Hennessey, Authorized Person
Date:	11/14/2025

Summit Partners Alydar GP, L.P.

Signature:	Adam H. Hennessey
Name/Title:	Adam H. Hennessey, Authorized Person
Date:	11/14/2025

Summit Partners Alydar GP, LLC

Signature:	Adam H. Hennessey
Name/Title:	Adam H. Hennessey, Authorized Person
Date:	11/14/2025

Philip Furse

Signature:	Adam H. Hennessey
Name/Title:	Adam H. Hennessey, POA for Philip Furse
Date:	11/14/2025

Timothy Albright

Signature:	Adam H. Hennessey
Name/Title:	Adam H. Hennessey, POA for Timothy Albright
Date:	11/14/2025

Robert MacAulay

Signature:	Adam H. Hennessey
Name/Title:	Adam H. Hennessey, POA for Robert MacAulay
Date:	11/14/2025

Matthew Curtis

Signature:	Adam H. Hennessey
Name/Title:	Adam H. Hennessey, POA for Matthew Curtis
Date:	11/14/2025

Exhibit Information

The information required by this item with respect to each Reporting Person is set forth in Rows 5 through 9 and 11 of each cover page to this Schedule 13G. The ownership percentages are calculated based on 44,603,740 outstanding shares of Common Stock, as of June 30, 2025, as reported in Issuer's 10-Q filed on August 1, 2025. SPPAM is the investment manager with respect to shares of Common Stock directly held by Summit Concentrated Growth, SPSO QP, SPSO LP, SPSO Limited and Summit Technology (collectively the "Funds") and a separately managed account. SP is the Managing Member of SPPAM. Summit Concentrated Growth, SPSO Limited, SPSO QP,SPSO LP and Summit Technology each directly holds shares of Common Stock. Fund GP is the general partner of Summit Concentrated Growth, SPSO QP, SPSO LP and Summit Technology. GP is the general partner of Fund GP. Philip Furse is the Chief Investment Officer of SPPAM and a Portfolio Manager of SPPAM, with respect to the shares of Common Stock directly held by the Funds and the separately managed account of SPPAM. Timothy Albright is a Portfolio Manager of SPPAM with respect to the shares of Common Stock directly held by the Funds and the separately managed account of SPPAM. Robert MacAulay is the Chief Risk Officer of SPPAM with respect to the shares of Common Stock directly held by the Funds and the separately managed account of SPPAM. Matthew Curtis is a Portfolio Manager of SPPAM with respect to the shares of Common Stock directly held by the Funds and the separately managed account of SPPAM. Accordingly, each of the Reporting Persons may be deemed the beneficial owner of the reported securities but the filing of this statement shall not be construed as an admission that any of the Reporting Persons is, for the purpose of 13(d) or 13(g) of the Act, the beneficial owner of any securities covered by this statement. Please note that the Reporting Persons do not have any voting control over any of the securities held by the separately managed account referenced herein. JOINT FILING AGREEMENT This will confirm the agreement by and among the undersigned that the Schedule 13G filed with the Securities and Exchange Commission on or about the date hereof with respect to the beneficial ownership by the undersigned of the Class A Common Stock, $0.01 par value, of Solaris Energy Infrastructure, Inc. (this "Agreement"), is being filed, and all amendments thereto will be filed, on behalf of each of the persons and entities named below that is named as a reporting person in such filing in accordance with Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended. This Agreement may be executed in two or more counterparts, each of which shall be deemed an original, but all of which together shall constitute one and the same instrument. Joint Filing Agreement dated November 14, 2025, among Summit Partners Public Asset Management, LLC, Summit Partners, L.P., Summit Partners Concentrated Growth L/S Master Fund, L.P., Summit Partners Technology L/S Master Fund, L.P., Summit Partners Sustainable Opportunities L/S Fund Limited, Summit Partners Sustainable Opportunities L/S QP Fund, L.P., Summit Partners Sustainable Opportunities L/S Fund, L.P., Summit Partners Alydar GP, L.P., Summit Partners Alydar GP, LLC, Philip Furse, Timothy Albright, Robert MacAulay and Matthew Curtis. Dated: November 14, 2025 Summit Partners Public Asset Management, LLC Signature: Adam H. Hennessey Name/Title: Adam H. Hennessey, Authorized Person Summit Partners, L.P. Signature: Adam H. Hennessey Name/Title: Adam H. Hennessey, Authorized Person Summit Partners Concentrated Growth LIS Master Fund, L.P. Signature: Adam H. Hennessey Name/Title: Adam H. Hennessey, Authorized Person Summit Partners Technology LIS Master Fund, L.P. Signature: Adam H. Hennessey Name/Title: Adam H. Hennesse Summit Partners Sustainable Opportunities LIS Fund Limited Signature: Adam H. Hennessey Name/Title: Adam H. Hennessey, Authorized Person Summit Partners Sustainable Opportunities LIS QP Fund, L.P. Signature: Adam H. Hennessey Name/Title: Adam H. Hennessey, Authorized Person Summit Partners Sustainable Opportunities LIS Fund, L.P. Signature: Adam H. Hennessey Name/Title: Adam H. Hennessey, Authorized Person Summit Partners Alydar GP, L.P. Signature: Adam H. Hennessey Name/Title: Adam H. Hennessey, Authorized Person Summit Partners Alydar GP, LLC Signature: Adam H. Hennessey Name/Title: Adam H. Hennessey, Authorized Person Philip Furse Signature: Adam H. Hennessey Name/Title: Adam H. Hennessey, POA for Philip Furse Timothy Albright Signature: Adam H. Hennessey Name/Title: Adam H. Hennessey, POA for Timothy Albright Robert MacAulay Signature: Adam H. Hennessey Name/Title: Adam H. Hennessey, POA for Robert MacAulay Matthew Curtis Signature: Adam H. Hennessey Name/Title: Adam H. Hennessey, POA for Matthew Curtis EXHIBIT B POWERS OF ATTORNEY Powers of Attorney, dated as of January 31, 2024, (incorporated herein by reference to Exhibit B to that certain Schedule 13G filed on January 31, 2024, with the Securities and Exchange Commission in connection with securities of Klaviyo, Inc.)