Walter Thomas McAndrew Jr. - 11 Jun 2026 Form 4 Insider Report for ERock, Inc. (EROC)

Reporting relationship: 10%+ Owner
Issuer ticker: EROC
Reported as of: 11 Jun 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 04 Sep 2026, 20:36:49 UTC
Prior SEC filing: 04 Sep 2026
Source filing: View source filing
Reporting owner signature: /s/ Walter Thomas McAndrew, Jr.

Key filing fact

Walter Thomas McAndrew Jr. filed Form 4 for ERock, Inc. (EROC) on 04 Sep 2026.

Key facts

This page summarizes Walter Thomas McAndrew Jr.'s Form 4 filing for ERock, Inc. (EROC).
5 reported transactions and 2 derivative rows are listed below.
Accepted by SEC: 04 Sep 2026, 20:36.

Change

Previous filing in this sequence was filed on 04 Sep 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 (1)

CIK 0002138568 Primary reporting owner

McAndrew Walter Thomas Jr.

Relationship: 10%+ Owner
Address: C/O EROCK, INC., 1113 VINE ST., SUITE 101, HOUSTON
Signature: /s/ Walter Thomas McAndrew, Jr.
Signature date: 04 Sep 2026

Reported non-derivative transactions

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

EROC transaction

Class A common stock, par value $0.01

Other

Transaction value
Shares: +50,550
Change %
Price
Shares after: 50,550
Date: 11 Jun 2026
Ownership: Direct
Footnotes: F1

EROC transaction

Class B common stock, par value $0.01

Other

Transaction value
Shares: -372,093
Change %: -5.8%
Price
Shares after: 5,996,469
Date: 11 Jun 2026
Ownership: Direct
Footnotes: F2, F3

EROC transaction

Class B common stock, par value $0.01

Other

Transaction value
Shares: -93,023
Change %: -0.56%
Price
Shares after: 16,540,099
Date: 11 Jun 2026
Ownership: By McAndrew Holdings, Ltd.
Footnotes: F2, F4, F5

Reported derivative securities

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

EROC transaction Derivative

Class B Units

Sale

Transaction value
Shares: -372,093
Change %: -5.8%
Price
Shares after: 5,996,469
Date: 11 Jun 2026
Ownership: Direct
Underlying class: Class A common stock, par value $0.01
Underlying amount: 372,093
Exercise price
Footnotes: F3, F6

EROC transaction Derivative

Class B Units

Sale

Transaction value
Shares: -93,023
Change %: -0.56%
Price
Shares after: 16,540,099
Date: 11 Jun 2026
Ownership: By McAndrew Holdings, Ltd.
Underlying class: Class A common stock, par value $0.01
Underlying amount: 93,023
Exercise price
Footnotes: F4, F5, 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

In connection with the initial public offering (the "IPO") of shares of Class A common stock, par value $0.01 per share (such shares, "Class A Shares"), of ERock, Inc. (the "Issuer"), the Issuer consummated certain mergers pursuant to which certain entities holding Class A membership interests ("Class A Units") of Enchanted Rock Holdings, LLC ("ER Holdings") merged with and into the Issuer (the "Blocker Mergers"), as described in the Issuer's prospectus filed with the Securities and Exchange Commission on June 10, 2026. In connection with the Blocker Mergers, 50,550 Class A Units held by ERock Holdings GP, LLC were exchanged for 50,550 Class A Shares issued to Walter Thomas McAndrew, Jr. ("Mr. McAndrew").

Footnote F2

Shares of the Issuer's Class B common stock, par value $0.01 per share (such shares, "Class B Shares"), have no economic value and entitle the holder to one vote per Class B Share held. One Class B Share was issued for each Class B membership interest (each, a "Class B Unit") of ER Holdings held.

Footnote F3

The Issuer used approximately $7.4 million of the IPO proceeds to purchase 372,093 Class B Units of ER Holdings from Mr. McAndrew. Upon such purchase, 372,093 of the Issuer's Class B Shares held by Mr. McAndrew were cancelled.

Footnote F4

The Issuer used approximately $1.8 million of the IPO proceeds to purchase 93,023 Class B Units of ER Holdings from McAndrew Holdings, Ltd. ("Holdings"). Upon such purchase, 93,023 of the Issuer's Class B Shares held by Holdings were cancelled.

Footnote F5

These securities are owned directly by Holdings. Mr. McAndrew may be deemed to share voting and investment power over the securities held by Holdings in his capacity as a manager of McAndrew Holdings, LLC, the general partner of Holdings. Mr. McAndrew disclaims beneficial ownership of the securities held by Holdings except to the extent of his pecuniary interest therein.

Footnote F6

The Class B Units of ER Holdings are exchangeable, at the holder's option, on a one-for-one basis into Class A Shares of the Issuer. Upon the exchange of Class B Units into Class A Shares, an equivalent number of Class B Shares will be automatically cancelled.