SEC Filing Document

Company: ERock, Inc.
Ticker: 
CIK: 2110029
Filing Type: DRS/A
Document Type: DRS/A
Date Filed: 2026-04-24
Accession Number: 0001193125-26-177695
Exchange: 
SIC Code: 3620
SIC Description: Electrical Industrial Apparatus
URL: https://www.sec.gov/Archives/edgar/data/2110029/000119312526177695/filename1.htm

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holding company, and our sole material asset is our ownership interest in ER Holdings. As the sole managing member of ER Holdings, we operate and control all of the business and affairs of ER Holdings and, through ER Holdings and its subsidiaries, conduct our business and will depend on distributions from ER Holdings to pay any taxes and other expenses. See “Organizational Structure.” We will use all of the net proceeds we receive from this offering to purchase Class A membership interests in ER Holdings (“Class A Units”) at a per interest purchase price equal to the per share price paid by the underwriters for our Class A common stock in this offering. We intend to cause ER Holdings to use the net proceeds of such purchase for the repayment of indebtedness, the repurchase of certain membership interests in ER Holdings and for general corporate purposes. See “Use of Proceeds.”

Following the consummation of this offering,     shares of our Class A common stock will be owned by the
pre-IPO owners of ER Holdings and     shares of our Class A common stock will be owned by public stockholders purchasing shares in this offering (or     shares and     shares,
respectively, if the underwriters exercise in full their option to purchase additional shares of Class A common stock), assuming a price per share of $   , the midpoint of the range set forth above.     shares of
our Class B common stock and corresponding Class B membership interests in ER Holdings (“Class B Units) will be owned by the pre-IPO owners of ER Holdings. Additionally,      Class M membership interests in ER Holdings
(“Class M Units”) will be owned by certain current and former employees and service providers of ER Holdings and its subsidiaries. As a result, (A) investors in this offering will indirectly own  % of the economic interests in ER
Holdings and  % of the total voting power in ERock (or approximately  % and  %, respectively, if the underwriters exercise in full their option to purchase additional shares of Class A common stock); and (B) the pre-IPO owners of
ER Holdings will directly or indirectly own  % of the economic interests in ER Holdings and  % of the total voting power in ERock (or approximately  % and  %, respectively, if the underwriters exercise in full their option to
purchase additional shares of Class A common stock). See “Organizational Structure.”

Investing in our
Class A common stock involves risks that are described in the “Risk Factors” section beginning on page 35 of this prospectus.

Per Share Total

Initial public offering price $ $

Underwriting discounts and commissions (1) $ $

Proceeds, before expenses, to us $ $

(1)	See “Underwriting” for a description of all underwriting compensation payable in connection
with this offering.

The underwriters may also exercise an option to purchase up to an
additional    shares of our Class A common stock from us, at the initial public offering price, less the underwriting discounts and commissions, for 30 days after the date of this prospectus.

Neither the Securities and Exchange Commission (“SEC”) nor any state securities commission has approved or disapproved of these
securities or passed on the adequacy or accuracy of this prospectus. Any representation to the contrary is a criminal offense.

The
shares of Class A common stock will be ready for delivery on or about    , 2026.

Joint Book-Running Managers

Morgan Stanley J.P. Morgan

Bookrunners

Barclays

Prospectus
Dated    , 2026.

Table of Contents

TABLE OF CONTENTS

Page

GLOSSARY OF INDUSTRY AND EROCK TERMS iii

PROSPECTUS SUMMARY 1

RISK FACTORS 35

CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING STATEMENTS 79

ORGANIZATIONAL STRUCTURE 81

USE OF PROCEEDS 87

DIVIDEND POLICY 88

CAPITALIZATION 89

DILUTION 90

MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS
OF OPERATIONS 92

BUSINESS 115

MANAGEMENT 144

Page

EXECUTIVE COMPENSATION 151

CERTAIN RELATIONSHIPS AND RELATED PERSON TRANSACTIONS 164

SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND
MANAGEMENT 172

DESCRIPTION OF CAPITAL STOCK 173

SHARES ELIGIBLE FOR FUTURE SALE 179

MATERIAL U.S. FEDERAL INCOME TAX CONSIDERATIONS 181

UNDERWRITING 186

LEGAL MATTERS 194

EXPERTS 194

WHERE YOU CAN FIND ADDITIONAL INFORMATION 194

INDEX TO FINANCIAL STATEMENTS F-1

Neither we
nor the underwriters have authorized anyone to provide you with information other than that contained in this prospectus or in any free writing prospectus prepared by or on behalf of us or to which we have referred you. We and the underwriters take
no responsibility for, and can provide no assurance as to the reliability of, any other information that others may give you. We and the underwriters are not making an offer to sell our Class A common stock in any jurisdiction where an offer or
sale is not permitted. The information contained in this prospectus or any free writing prospectus is accurate only as of its date, regardless of its time of delivery or of any sale of shares of our Class A common stock. Our business, financial
condition, results of operations and prospects may have changed since that date.

For investors outside of the United
States: Neither we nor the underwriters have done anything that would permit this offering, or possession or distribution of this prospectus, in any jurisdiction where action for that purpose is required, other than the United States. Persons
outside of the United States who come into possession of this prospectus must inform themselves about, and observe any restrictions relating to, the offering of the shares of our Class A common stock and the distribution of this prospectus
outside of the United States.

This prospectus contains forward-looking statements that are subject to a number of risks
and uncertainties, many of which are beyond our control. See “Risk Factors” and “Cautionary Statement Regarding Forward-Looking Statements.”

Basis of Presentation

ERock was formed as a Delaware corporation on January 20, 2026 and will have no assets or operations prior to the
Reorganization (as defined below). Since 2018, we have conducted substantially all of our operations through ER Holdings, which was formed in connection with a corporate restructuring, prior to which we conducted our operations through ERock
Holdings, Ltd., a Texas limited partnership. Accordingly, this prospectus includes certain historical consolidated financial and other data of ER Holdings.

Immediately following this offering, ERock will be a holding company, and its sole material asset will be Class A
membership interests in ER Holdings (“Class A Units”), which ERock will hold either directly or indirectly through one or more wholly owned subsidiaries. ERock (or one of its wholly owned subsidiaries) will be the sole managing
member of ER Holdings and, in that capacity, will operate and control all of the business and affairs of ER Holdings and, through ERock and its subsidiaries, conduct our business. The Reorganization

Table of Contents

(as defined below) will be accounted for as a reorganization of entities under common control. As a result, the consolidated financial statements of ERock will recognize the assets and
liabilities received in the Reorganization at their historical carrying amounts, as reflected in the historical financial statements of ER Holdings. ERock will consolidate ER Holdings on its consolidated financial statements and record a non-controlling interest related to the Class B Units in ER Holdings on its consolidated balance sheet and statement of income. See “Organizational Structure.”

Except as otherwise indicated or required by the context, all references to “ERock,” “Enchanted Rock,”
the “Company,” “we,” “our” and “us” or similar terms refer to (i) ER Holdings and its consolidated subsidiaries before the Reorganization and (ii) ERock and its consolidated subsidiaries
after the Reorganization. Except as otherwise indicated or the context otherwise requires, references to “common stock” refer to our Class A common stock and Class B common stock, collectively.

Except as otherwise indicated, all information contained in this prospectus (i) assumes an initial public offering price
of $    per share of Class A common stock (the midpoint of the price range set forth on the cover of this prospectus) and (ii) assumes that the underwriters do not exercise their option to purchase additional
shares.

For the definitions of certain terms and abbreviations used in this prospectus, see “Glossary of Industry
and ERock Terms” beginning on page iii of this prospectus.

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