SEC Filing Document

Company: ERock, Inc.
Ticker: 
CIK: 2110029
Filing Type: S-1
Document Type: S-1
Date Filed: 2026-05-15
Accession Number: 0001193125-26-227199
Exchange: 
SIC Code: 3620
SIC Description: Electrical Industrial Apparatus
URL: https://www.sec.gov/Archives/edgar/data/2110029/000119312526227199/d12401ds1.htm

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Stanley & Co. LLC and J.P. Morgan Securities LLC are acting as representatives, have severally agreed to purchase, and we have agreed to sell to them, severally, the number of shares indicated below: Name Number of Shares Morgan Stanley & Co. LLC J.P. Morgan Securities LLC Barclays Capital Inc. BofA Securities, Inc. Evercore Group L.L.C. Guggenheim Securities, LLC Nomura Securities International, Inc. WR Securities, LLC BNP Paribas Securities Corp. Total: “Wolfe | Nomura Alliance” is the marketing name used by Wolfe Research Securities and Nomura Securities International, Inc. in connection with certain equity capital markets activities conducted jointly by the firms. Both Nomura Securities International, Inc. and WR Securities, LLC are serving as underwriters in the offering described herein. In addition, WR Securities, LLC and certain of its affiliates may provide sales support services, investor feedback, investor education, and/ or other independent equity research services in connection with this offering.

The underwriters and the representatives are collectively referred to as the “underwriters” and the
“representatives,” respectively. The underwriters are offering the shares of Class A common stock subject to their acceptance of the shares from us and subject to prior sale. The underwriting agreement provides that the obligations
of the several underwriters to pay for and accept delivery of the shares of Class A common stock offered by this prospectus are subject to the approval of certain legal matters by their counsel and to certain other conditions. The underwriters
are obligated to take and pay for all of the shares of Class A common stock offered by this prospectus if any such shares are taken. However, the underwriters are not required to take or pay for the shares covered by the underwriters’
over-allotment option described below.

The underwriters initially propose to offer part of the shares of Class A
common stock directly to the public at the offering price listed on the cover page of this prospectus and part to certain dealers at a price that represents a concession not in excess of $   per share under the public offering
price. After the initial offering of the shares of Class A common stock, the offering price and other selling terms may from time to time be varied by the representatives. Sales of Class A common stock made outside of the United States may
be made by affiliates of the underwriters.

We have granted to the underwriters an option, exercisable for 30 days from
the date of this prospectus, to purchase up to    additional shares of Class A common stock at the public offering price listed on the cover page of this prospectus, less underwriting discounts and commissions. The
underwriters may exercise this option solely for the purpose of covering over-allotments, if any, made in connection with the offering of the shares of Class A common stock offered by this prospectus. To the extent the over-allotment option is
exercised, each underwriter will become obligated, subject to certain conditions, to purchase about the same percentage of the additional shares of Class A common stock as the number listed next to the underwriter’s name in the preceding
table bears to the total number of shares of Class A common stock listed next to the names of all underwriters in the preceding table.

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The following table shows the per share and total public offering price,
underwriting discounts and commissions, and proceeds before expenses to us. These amounts are shown assuming both no exercise and full exercise of the underwriters’ over-allotment option.

Per Share Total

No Exercise Full Exercise

Public offering price $ $ $

Underwriting discounts and commissions to be paid by us:

Proceeds, before expenses, to us $ $ $

The estimated offering expenses payable by us, exclusive of the underwriting discounts and
commissions, are approximately $    million. We have agreed to reimburse the underwriters for their expenses relating to clearance of this offering with the Financial Industry Regulatory Authority (“FINRA”) up to

The underwriters have informed us that they do not intend sales to discretionary accounts to
exceed 5% of the total number of shares of Class A common stock offered by them.

We have applied to list our
Class A common stock on the NYSE under the trading symbol “EROC”.

We, our directors and executive
officers and the holders of substantially all of our Class A and Class B common stock, stock options, or any securities convertible into or exercisable or exchangeable for, or that represent the right to receive, Class A common stock,
including ER Holdings membership interests convertible or exercisable or exchangeable for or that represent the right to receive Class A common stock, have agreed that, without the prior written consent of    on behalf
of the underwriters, we and they will not, and will not publicly disclose an intention to, during the period ending 180 days after the date of this prospectus (the “Restricted Period”):

• offer, pledge, sell, contract to sell, sell any option or contract to purchase, purchase any option or
contract to sell, grant any option, right or warrant to purchase, lend or otherwise transfer or dispose of, directly or indirectly, any shares of Class A common stock or any securities convertible into or exercisable or exchangeable for shares
of Class A common stock;

• file any registration statement with the Securities and Exchange Commission relating to the offering of any
shares of Class A common stock or any securities convertible into or exercisable or exchangeable for Class A common stock; or

• enter into any swap or other arrangement that transfers to another, in whole or in part, any of the economic
consequences of ownership of the Class A common stock;

whether any such transaction described
above is to be settled by delivery of Class A common stock or such other securities, in cash or otherwise. In addition, we and each such person have agreed or will agree that, without the prior written consent of    on
behalf of the underwriters, we or such other person will not, during the Restricted Period, make any demand for, or exercise any right with respect to, the registration of any shares of Class A common stock or any security convertible into or
exercisable or exchangeable for Class A common stock.

The restrictions described in the immediately preceding
paragraph to do not apply to:

• the sale of shares to the underwriters;

• the issuance by the Company of shares of Class A common stock upon the exercise of an option or a warrant
or the conversion of a security outstanding on the date of this prospectus of which the underwriters have been advised in writing;

• transactions by any person other than us relating to shares of Class A common stock or other securities
acquired in open market transactions after the completion of the offering of the shares; provided that no

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filing under Section 16(a) of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), is required or voluntarily made in connection with subsequent sales of the
Class A common stock or other securities acquired in such open market transactions; or

• facilitating the establishment of a trading plan on behalf of a shareholder, officer or director of the
Company pursuant to Rule 10b5-1 under the Exchange Act for the transfer of shares of Class A common stock, provided that (i) such plan does not provide for the transfer of Class A common stock
during the restricted period and (ii) to the extent a public announcement or filing under the Exchange Act, if any, is required of or voluntarily made by the Company regarding the establishment of such plan, such announcement or filing shall
include a statement to the effect that no transfer of Class A common stock may be made under such plan during the restricted period.

, in its sole discretion, may release the Class A common stock and other securities subject
to the lock-up agreements described above in whole or in part at any time.