AMERICAN SECURITIES LLC - 19 Aug 2026 Form 4 Insider Report for SOLV Energy, Inc. (MWH)

Reporting relationship: 10%+ Owner
Issuer ticker: MWH
Reported as of: 19 Aug 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 21 Aug 2026, 20:15:11 UTC
Prior SEC filing: 05 Jun 2026
Source filing: View source filing
Reporting owner signature: See Exhibit 99.1

Key filing fact

AMERICAN SECURITIES LLC filed Form 4 for SOLV Energy, Inc. (MWH) on 21 Aug 2026.

Key facts

This page summarizes AMERICAN SECURITIES LLC's Form 4 filing for SOLV Energy, Inc. (MWH).
3 reported transactions and 10 derivative rows are listed below.
Accepted by SEC: 21 Aug 2026, 20:15.

Change

Previous filing in this sequence was filed on 05 Jun 2026.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (10)

CIK 0001475483 Primary reporting owner

AMERICAN SECURITIES LLC

Relationship: 10%+ Owner
Address: 590 MADISON AVENUE, 38TH FLOOR, NEW YORK
Signature: See Exhibit 99.1
Signature date: 21 Aug 2026

CIK 0002109987

ASP Endeavor Investco LP

Relationship: 10%+ Owner
Address: 590 MADISON AVENUE, 38TH FLOOR, NEW YORK
Signature: See Exhibit 99.1
Signature date: 21 Aug 2026

CIK 0002109986

ASP SOLV Aggregator LP

Relationship: 10%+ Owner
Address: 590 MADISON AVENUE, 38TH FLOOR, NEW YORK
Signature: See Exhibit 99.1
Signature date: 21 Aug 2026

CIK 0002109985

ASP VIII Alternative Investments, L.P.

Relationship: 10%+ Owner
Address: 590 MADISON AVENUE, 38TH FLOOR, NEW YORK
Signature: See Exhibit 99.1
Signature date: 21 Aug 2026

CIK 0002110518

American Securities Associates VIII, LLC

Relationship: 10%+ Owner
Address: 590 MADISON AVENUE, 38TH FLOOR, NEW YORK
Signature: See Exhibit 99.1
Signature date: 21 Aug 2026

CIK 0002109980

AS/ASP VIII Co-Investor, LLC

Relationship: 10%+ Owner
Address: 590 MADISON AVENUE, 38TH FLOOR, NEW YORK
Signature: See Exhibit 99.1
Signature date: 21 Aug 2026

CIK 0001621183

ASP Manager Corp.

Relationship: 10%+ Owner
Address: 590 MADISON AVENUE, 38TH FLOOR, NEW YORK
Signature: See Exhibit 99.1
Signature date: 21 Aug 2026

CIK 0001718376

American Securities Partners VIII(B), L.P.

Relationship: 10%+ Owner
Address: 590 MADISON AVENUE, 38TH FLOOR, NEW YORK
Signature: See Exhibit 99.1
Signature date: 21 Aug 2026

CIK 0002110367

ASP VIII SOLV Holdings LP

Relationship: 10%+ Owner
Address: 590 MADISON AVENUE, 38TH FLOOR, NEW YORK
Signature: See Exhibit 99.1
Signature date: 21 Aug 2026

CIK 0002110366

ASP VIII CSE Holdings LP

Relationship: 10%+ Owner
Address: 590 MADISON AVENUE, 38TH FLOOR, NEW YORK
Signature: See Exhibit 99.1
Signature date: 21 Aug 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

MWH transaction

Class A Common Stock

Conversion of derivative security

Transaction value
Shares: +3,069,193
Change %: +3.7%
Price
Shares after: 85,989,594
Date: 19 Aug 2026
Ownership: See Notes
Footnotes: F1, F2, F4, F6

MWH transaction

Class A Common Stock

Conversion of derivative security

Transaction value
Shares: +3,069,193
Change %: +3.7%
Price
Shares after: 85,989,594
Date: 19 Aug 2026
Ownership: See Notes
Footnotes: F1, F2, F4, F6

MWH transaction

Class A Common Stock

Conversion of derivative security

Transaction value
Shares: +3,069,193
Change %: +3.7%
Price
Shares after: 85,989,594
Date: 19 Aug 2026
Ownership: See Notes
Footnotes: F1, F2, F4, F6

MWH transaction

Class A Common Stock

Conversion of derivative security

Transaction value
Shares: +3,069,193
Change %: +3.7%
Price
Shares after: 85,989,594
Date: 19 Aug 2026
Ownership: See Notes
Footnotes: F1, F2, F4, F6

MWH transaction

Class A Common Stock

Conversion of derivative security

Transaction value
Shares: +3,069,193
Change %: +3.7%
Price
Shares after: 85,989,594
Date: 19 Aug 2026
Ownership: See Notes
Footnotes: F1, F2, F4, F6

MWH transaction

Class A Common Stock

Conversion of derivative security

Transaction value
Shares: +3,069,193
Change %: +3.7%
Price
Shares after: 85,989,594
Date: 19 Aug 2026
Ownership: See Notes
Footnotes: F1, F2, F4, F6

MWH transaction

Class A Common Stock

Conversion of derivative security

Transaction value
Shares: +3,069,193
Change %: +3.7%
Price
Shares after: 85,989,594
Date: 19 Aug 2026
Ownership: See Notes
Footnotes: F1, F2, F4, F6

MWH transaction

Class A Common Stock

Conversion of derivative security

Transaction value
Shares: +3,069,193
Change %: +3.7%
Price
Shares after: 85,989,594
Date: 19 Aug 2026
Ownership: See Notes
Footnotes: F1, F2, F4, F6

MWH transaction

Class A Common Stock

Conversion of derivative security

Transaction value
Shares: +3,069,193
Change %: +3.7%
Price
Shares after: 85,989,594
Date: 19 Aug 2026
Ownership: See Notes
Footnotes: F1, F2, F4, F6

MWH transaction

Class A Common Stock

Conversion of derivative security

Transaction value
Shares: +3,069,193
Change %: +3.7%
Price
Shares after: 85,989,594
Date: 19 Aug 2026
Ownership: See Notes
Footnotes: F1, F2, F4, F6

MWH transaction

Class A Common Stock

Sale

Transaction value
Shares: -7,939,153
Change %: -9.2%
Price
Shares after: 78,050,441
Date: 19 Aug 2026
Ownership: See Notes
Footnotes: F1, F2, F5, F6

MWH transaction

Class A Common Stock

Sale

Transaction value
Shares: -7,939,153
Change %: -9.2%
Price
Shares after: 78,050,441
Date: 19 Aug 2026
Ownership: See Notes
Footnotes: F1, F2, F5, F6

MWH transaction

Class A Common Stock

Sale

Transaction value
Shares: -7,939,153
Change %: -9.2%
Price
Shares after: 78,050,441
Date: 19 Aug 2026
Ownership: See Notes
Footnotes: F1, F2, F5, F6

MWH transaction

Class A Common Stock

Sale

Transaction value
Shares: -7,939,153
Change %: -9.2%
Price
Shares after: 78,050,441
Date: 19 Aug 2026
Ownership: See Notes
Footnotes: F1, F2, F5, F6

MWH transaction

Class A Common Stock

Sale

Transaction value
Shares: -7,939,153
Change %: -9.2%
Price
Shares after: 78,050,441
Date: 19 Aug 2026
Ownership: See Notes
Footnotes: F1, F2, F5, F6

MWH transaction

Class A Common Stock

Sale

Transaction value
Shares: -7,939,153
Change %: -9.2%
Price
Shares after: 78,050,441
Date: 19 Aug 2026
Ownership: See Notes
Footnotes: F1, F2, F5, F6

MWH transaction

Class A Common Stock

Sale

Transaction value
Shares: -7,939,153
Change %: -9.2%
Price
Shares after: 78,050,441
Date: 19 Aug 2026
Ownership: See Notes
Footnotes: F1, F2, F5, F6

MWH transaction

Class A Common Stock

Sale

Transaction value
Shares: -7,939,153
Change %: -9.2%
Price
Shares after: 78,050,441
Date: 19 Aug 2026
Ownership: See Notes
Footnotes: F1, F2, F5, F6

MWH transaction

Class A Common Stock

Sale

Transaction value
Shares: -7,939,153
Change %: -9.2%
Price
Shares after: 78,050,441
Date: 19 Aug 2026
Ownership: See Notes
Footnotes: F1, F2, F5, F6

MWH transaction

Class A Common Stock

Sale

Transaction value
Shares: -7,939,153
Change %: -9.2%
Price
Shares after: 78,050,441
Date: 19 Aug 2026
Ownership: See Notes
Footnotes: F1, F2, F5, F6

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

MWH transaction Derivative

SOLV Energy Holdings LLC Interests

Conversion of derivative security

Transaction value
Shares: -3,069,193
Change %: -5.9%
Price
Shares after: 49,189,706
Date: 19 Aug 2026
Ownership: See Notes
Underlying class: Class A Common Stock
Underlying amount: 3,069,193
Exercise price
Footnotes: F1, F2, F3, F4, F6

MWH transaction Derivative

SOLV Energy Holdings LLC Interests

Conversion of derivative security

Transaction value
Shares: -3,069,193
Change %: -5.9%
Price
Shares after: 49,189,706
Date: 19 Aug 2026
Ownership: See Notes
Underlying class: Class A Common Stock
Underlying amount: 3,069,193
Exercise price
Footnotes: F1, F2, F3, F4, F6

MWH transaction Derivative

SOLV Energy Holdings LLC Interests

Conversion of derivative security

Transaction value
Shares: -3,069,193
Change %: -5.9%
Price
Shares after: 49,189,706
Date: 19 Aug 2026
Ownership: See Notes
Underlying class: Class A Common Stock
Underlying amount: 3,069,193
Exercise price
Footnotes: F1, F2, F3, F4, F6

MWH transaction Derivative

SOLV Energy Holdings LLC Interests

Conversion of derivative security

Transaction value
Shares: -3,069,193
Change %: -5.9%
Price
Shares after: 49,189,706
Date: 19 Aug 2026
Ownership: See Notes
Underlying class: Class A Common Stock
Underlying amount: 3,069,193
Exercise price
Footnotes: F1, F2, F3, F4, F6

MWH transaction Derivative

SOLV Energy Holdings LLC Interests

Conversion of derivative security

Transaction value
Shares: -3,069,193
Change %: -5.9%
Price
Shares after: 49,189,706
Date: 19 Aug 2026
Ownership: See Notes
Underlying class: Class A Common Stock
Underlying amount: 3,069,193
Exercise price
Footnotes: F1, F2, F3, F4, F6

MWH transaction Derivative

SOLV Energy Holdings LLC Interests

Conversion of derivative security

Transaction value
Shares: -3,069,193
Change %: -5.9%
Price
Shares after: 49,189,706
Date: 19 Aug 2026
Ownership: See Notes
Underlying class: Class A Common Stock
Underlying amount: 3,069,193
Exercise price
Footnotes: F1, F2, F3, F4, F6

MWH transaction Derivative

SOLV Energy Holdings LLC Interests

Conversion of derivative security

Transaction value
Shares: -3,069,193
Change %: -5.9%
Price
Shares after: 49,189,706
Date: 19 Aug 2026
Ownership: See Notes
Underlying class: Class A Common Stock
Underlying amount: 3,069,193
Exercise price
Footnotes: F1, F2, F3, F4, F6

MWH transaction Derivative

SOLV Energy Holdings LLC Interests

Conversion of derivative security

Transaction value
Shares: -3,069,193
Change %: -5.9%
Price
Shares after: 49,189,706
Date: 19 Aug 2026
Ownership: See Notes
Underlying class: Class A Common Stock
Underlying amount: 3,069,193
Exercise price
Footnotes: F1, F2, F3, F4, F6

MWH transaction Derivative

SOLV Energy Holdings LLC Interests

Conversion of derivative security

Transaction value
Shares: -3,069,193
Change %: -5.9%
Price
Shares after: 49,189,706
Date: 19 Aug 2026
Ownership: See Notes
Underlying class: Class A Common Stock
Underlying amount: 3,069,193
Exercise price
Footnotes: F1, F2, F3, F4, F6

MWH transaction Derivative

SOLV Energy Holdings LLC Interests

Conversion of derivative security

Transaction value
Shares: -3,069,193
Change %: -5.9%
Price
Shares after: 49,189,706
Date: 19 Aug 2026
Ownership: See Notes
Underlying class: Class A Common Stock
Underlying amount: 3,069,193
Exercise price
Footnotes: F1, F2, F3, F4, F6

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 6 footnotes

Footnote F1

Shares of Class A common stock of the Issuer ("Class A common stock") are owned directly by ASP VIII Alternative Investments Solstice, L.P. ("New ASP") and Class A common stock and common units ("Opco LLC Interests") of SOLV Energy Holdings LLC ("Opco") are owned directly by ASP Endeavor Investco LP ("ASP Investco") and ASP SOLV Aggregator LP ("ASP SOLV Aggregator"). American Securities Partners VIII(B), L.P. ("Sponsor 1"), ASP VIII Alternative Investments L.P. ("Sponsor 2") and AS/ASP VIII Co-Investor LLC ("Sponsor 3") are the owners of partnership interests in ASP Investco and ASP SOLV Aggregator. American Securities Associates VIII, LLC ("AS Associates VIII") is the general partner of Sponsor 1, Sponsor 2, and New ASP. American Securities LLC ("AS LLC") provides investment advisory services to Sponsor 1, Sponsor 2, and New ASP. ASP VIII SOLV Holdings LP ("Aggregator 1") and ASP VIII CSE Holdings LP ("Aggregator 2") are the owners of the partnership interests in New ASP.

Footnote F2

AS LLC is also the sole stockholder of ASP Manager Corp. ("ASP Manager"), which is the general partner of ASP Investco, ASP SOLV Aggregator, Aggregator 1 and Aggregator 2 and the manager of Sponsor 3. ASP Investco, ASP SOLV Aggregator, New ASP, Sponsor 1, Sponsor 2, Sponsor 3, AS Associates VIII, Aggregator 1, Aggregator 2, AS LLC and ASP Manager are referred to herein as "Reporting Persons".

Footnote F3

Pursuant to the limited liability company agreement ("Opco LLCA") of OpCo, each of ASP Investco and ASP SOLV Aggregator is entitled to redeem Opco LLC Interests for, at the Issuer's election, shares of Class A common stock on a one-for-one basis or, using proceeds from a substantially contemporaneous follow-on or secondary offering, a cash payment equal to the price per share of the Class A common stock net of any underwriting discounts or commissions paid in such offering, in each case in accordance with the terms of the Opco LLCA. Upon redemption or direct exchange, an equal number of shares of Class B common stock of the Issuer also held by ASP Investco and/or ASP SOLV Aggregator will be surrendered to and cancelled by the Issuer for no additional consideration. Each share of Class B common stock entitles the holder thereof to one vote per share but carries no economic rights. Opco LLC Interests have no expiration date.

Footnote F4

Represents the direct exchange of 795,642 Opco LLC Interests and 2,273,551 Opco LLC Interests by ASP Investco and ASP SOLV Aggregator, respectively, for Class A common stock on a one-for-one basis (and the cancellation of an equal number of shares of Class B common stock of the Issuer held by each such Reporting Person).

Footnote F5

Represents the sale of 798,412 shares of Class A common stock, 2,281,394 shares of Class A common stock and 4,859,347 shares of Class A common stock by ASP Investco, ASP SOLV Aggregator and New ASP, respectively, at a sale price of $27.77 per share of Class A common stock.

Footnote F6

Each of the Reporting Persons disclaims beneficial ownership of the securities listed in this report, and this report shall not be deemed an admission that the Reporting Person is the beneficial owner of such securities for the purpose of Section 16 or for any other purpose, except to the extent of such Reporting Person's pecuniary interest therein.

SEC remarks

Exhibit 99.1 (Joint Filer Information and Signatures) is incorporated herein by reference. This Form 4 is the first of two identical Form 4s filed relating to the same event. The Form 4 has been split into two filings because there are more than 10 Reporting Persons in total, and the SEC's EDGAR filing system limits a single Form 4 to a maximum of 10 Reporting Persons. Each Form 4 is filed by Designated Filer, American Securities LLC.