SEC Filing Document

Company: ERock, Inc.
Ticker: 
CIK: 2110029
Filing Type: DRS/A
Document Type: DRS/A
Date Filed: 2026-04-01
Accession Number: 0001193125-26-138217
Exchange: 
SIC Code: 3620
SIC Description: Electrical Industrial Apparatus
URL: https://www.sec.gov/Archives/edgar/data/2110029/000119312526138217/filename1.htm

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Holdings. 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, Inc. (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, Inc. (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 33 of this prospectus. Per Share Total Initial public offering price $ $ Underwriting discounts and commissions (1) $ $

Proceeds, before expenses, to ERock, Inc. $ $

(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 33

CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING STATEMENTS 77

ORGANIZATIONAL STRUCTURE 79

USE OF PROCEEDS 84

DIVIDEND POLICY 85

CAPITALIZATION 86

DILUTION 87

MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS
OF OPERATIONS 88

BUSINESS 110

MANAGEMENT 139

Page

EXECUTIVE COMPENSATION 146

CERTAIN RELATIONSHIPS AND RELATED PERSON TRANSACTIONS 159

SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND
MANAGEMENT 166

DESCRIPTION OF CAPITAL STOCK 167

SHARES ELIGIBLE FOR FUTURE SALE 173

MATERIAL U.S. FEDERAL INCOME TAX CONSIDERATIONS 175

UNDERWRITING 180

LEGAL MATTERS 189

EXPERTS 189

WHERE YOU CAN FIND ADDITIONAL INFORMATION 189

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, Inc. (“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 Enchanted Rock Holdings, LLC, a Delaware limited liability company formed in connection with a corporate
restructuring (“ER Holdings”), prior to which we conducted our operations through ERock Holdings, Ltd. 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. As the sole managing member of ER Holdings, ERock will operate and control all
of the business and affairs of ER Holdings and, through ERock and its

Table of Contents

subsidiaries, conduct our business. The Reorganization (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 membership interests in ER Holdings (“Class B Units”) held by Class B stockholders of
ERock 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.

Industry and Market Data

Certain market and industry data and forecasts used in this prospectus have been obtained from the following independent
industry publications or reports: (i) International Energy Agency; (ii) North American Electric Reliability Corporation; (iii) Institute for Energy Economics and Financial Analysis; (iv) Wood Mackenzie; and (v) publicly available
reports and data. Some market data and statistical information contained in this prospectus are also based on management’s estimates and calculations, which are derived from our review and interpretation of publicly available industry
publications, our internal research and our knowledge of the markets in which we currently, and will in the future, operate. This information involves a number of assumptions and limitations, and you are cautioned not to give undue weight to such
information. Forecasts and other forward-looking information obtained from these sources are subject to the same qualifications and uncertainties as the other forward-looking statements in this prospectus. Statements as to our market position are
based on market data currently available to us, as well as management’s estimates and assumptions regarding the size of our markets within our industry. While we are not aware of any misstatements regarding our industry data presented herein,
our estimates involve risks and uncertainties and are subject to change based on various factors, including those discussed under the headings “Risk Factors” and “Cautionary Statement Regarding Forward-Looking Statements” in
this prospectus. Neither we nor the underwriters can guarantee the accuracy or completeness of such information contained in this prospectus.

Trademarks and Trade Names

We own or have rights to various trademarks, service marks and trade names that we use in connection with the operation of our
business. This prospectus may also contain trademarks, service marks and trade names of third parties, which are the property of their respective owners. Our use or display of third parties’ trademarks, service marks, trade names or products
in this prospectus is not intended to, and does not imply, a relationship with us or an endorsement or sponsorship by or of us. Solely for convenience, the trademarks, service marks and trade names referred to in this prospectus may appear without
the ®, ™ or SM symbols, but such references are not intended to indicate, in any way, that we will not assert, to the fullest extent
under applicable law, our rights or the right of the applicable licensor to these trademarks, service marks and trade names.

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GLOSSARY OF INDUSTRY AND EROCK TERMS

The terms and abbreviations defined in this section are used throughout this prospectus:

• “AI” refers to artificial intelligence.