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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as amended, and comparable state laws that protect and regulate employee health and safety. Based upon consideration of currently available information, we believe liabilities for environmental and health and safety matters will not have a material adverse impact on our consolidated financial statements, but we cannot assure that such liabilities may not arise in the future. For further information on environmental-related risks, including climate change, and health and safety-related risks, see “Risk Factors—Risks Related to Laws, Regulations and Other Legal Matters.” Operating Risks and Insurance Our operations are subject to various hazards, including those inherent in the assembly, installation, operation and maintenance of distributed power systems. Such risks include damage to natural gas pipelines, our power systems, or related equipment or infrastructure; fires, ruptures, earthquakes and explosions and other hazards that could also result in personal injury and loss of life, property damage, pollution and suspension of Table of Contents

operations. In addition, our generator units in our power systems are considered high energy systems because they consume natural gas and may operate up to 480 volts. High-voltage electricity
poses potential shock hazards, while natural gas, associated with use of our power systems, is flammable and therefore is a potentially dangerous fuel capable of causing fires and other harm. There can be no assurance that our products will continue
to be certified to meet certain design and safety standards, and if our equipment is not properly handled or if there are undiscovered issues with our equipment, there could be system failure and resulting damage, injury, death or liability.

We maintain insurance against civil liabilities relating to personal injuries to third parties, for loss of or damage to
property, for business interruptions and for certain environmental matters, that provides coverage, subject to the applicable coverage limits, deductibles and retentions, and exclusions, that we believe are appropriate upon terms and conditions and
for premiums that we consider fair and reasonable in the circumstances. There can be no assurance that we will not incur losses beyond the limits of or outside the coverage of our insurance.

Seasonality

Our
operations are not subject to significant seasonal variation in demand or supply.

Employees

Our employees are a critical asset and are key to our innovative culture and overall success. We are focused on building upon
our high-performance culture by attracting, engaging, developing, retaining and rewarding top talent. We strive to enhance the economic and social well-being of our employees. We are committed to providing a welcoming, inclusive environment for our
workforce, with training and career development opportunities to enable employees to thrive and achieve their career goals.

As of May 1, 2026, we have approximately 440 employees, none of whom are represented by labor unions or subject to collective
bargaining agreements. To meet accelerating demand, we expect to hire additional employees over the next 12 months, with a significant portion expected to be located in O&M services.

Health and Safety

We believe our corporate culture plays a significant role in our ability to consistently deliver efficient and reliable service
to our customers, as well as our ability to attract and retain high quality personnel. Safety is a focus for our operations, and we have a proven track record in safety with average TRIR of 0.93 for the years ended December 31, 2025, 2024 and
2023. We conduct weekly company-wide safety meetings and biweekly safety trainings in addition to other additional ad hoc safety trainings. We also have a designated safety leader responsible for advancing our culture of safety.

Employee Welfare and Development

We provide employees the option to participate in health and welfare plans, including medical, dental, life, accidental death
and dismemberment and short-term and long-term disability insurance plans. We also offer a number of health and wellness programs, including telemedicine, health screens and fitness reimbursement as well as access to the Employee Assistance Program
which provides employees and their family members access to professional providers to help navigate challenging life events 24 hours a day/365 days a year.

Legal Proceedings

We are
from time to time involved in other various claims, litigation matters, contract negotiations and disputes, and we anticipate that we will be involved in such matters from time to time in the future. The operating

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hazards inherent in our business expose us to claims and litigation, including personal injury litigation, environmental litigation, contractual litigation with customers, intellectual property
litigation, tax or securities litigation and administrative actions by regulatory agencies. Risks associated with litigation include potential negative outcomes, the costs associated with asserting our claims or defending such lawsuits, and the
diversion of management’s attention to these matters. We may also be subject to significant legal costs in defending these actions, which we may or may not be able to recoup depending on the results of such claim. While many of these matters
involve inherent uncertainty, we believe that the amount of the liability, if any, ultimately incurred with respect to current proceedings or claims will not have a material adverse effect on our consolidated financial position as a whole or on our
liquidity, capital resources or future annual results of operations.

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MANAGEMENT

The following table sets forth certain information as of    , 2026 regarding individuals who are
expected to serve as our executive officers and directors upon the completion of this offering.

Name Age Position

John Carrington 60 Chief Executive Officer and Director

Corey Amthor 59 President

Ian Blakely 49 Chief Financial Officer

Paul Froutan 51 Chief Operating Officer

Davis Zapffe 38 General Counsel and Secretary

Non-Employee Director Nominees:

Charles Boynton 58 Director Nominee

Dan Brouillette 63 Director Nominee

Hans Kobler 60 Director Nominee

Lindsay Luger 45 Director Nominee

Mark Patterson 65 Director Nominee

Sameer Reddy 42 Director Nominee

Tony Satterthwaite 65 Director Nominee

Our Executive Officers and Director

John Carrington has served as Chief Executive Officer of ER Holdings since November 2025 and as Chairman of the
ER Holdings board of managers since June 2025. Mr. Carrington has served as Chief Executive Officer and a director of ERock, Inc. since January 2026. Previously, from December 2013 through December 2024, Mr. Carrington served as Chief Executive
Officer and a member of the board of directors of Stem, Inc., a NYSE-listed provider of AI-driven clean energy software and services. Prior to joining Stem, Mr. Carrington served as Chief Executive Officer of MiaSolé, Inc., a manufacturer of
thin-film photovoltaic solar panels, through its sale to Hanergy in December 2012. Earlier in his career, Mr. Carrington worked at First Solar and spent over 16 years at General Electric Company, where he held leadership roles across product
management, manufacturing, sales and international operations, including four years leading commercial and marketing activities in Japan. Mr. Carrington holds a Bachelor of Arts in Marketing and Economics from the University of Colorado, Boulder.

Mr. Carrington is qualified to serve on our board of directors due to his extensive executive leadership experience
in the energy and infrastructure sectors and his experience leading companies through periods of rapid growth and transformation.

Corey Amthor has served on the ER Holdings board of managers since November 2014 and as ER Holdings’
President since March 2020. Mr. Amthor has served as President of ERock, Inc. since January 2026. Mr. Amthor also served as ER Holdings’ interim Chief Executive Officer from June 2025 to December 2025 and as its Chief Financial Officer from
June 2024 to June 2025. Prior to joining ER Holdings in 2014, Mr. Amthor held senior roles at Calpine, ConAgra, DuPont/Conoco, and Statoil. Mr. Amthor holds a Bachelor of Science in Agricultural Economics and an MBA from the University of Missouri.

Ian Blakely has served as ER Holdings’ Chief Financial Officer since June 2025, a role he previously
held from October 2014 to April 2020. Mr. Blakely has served as Chief Financial Officer of ERock, Inc. since January 2026. Since joining ER Holdings in 2015, Mr. Blakely has held roles of increasing responsibility, including serving as ER
Holdings’ Chief Strategy Officer from May 2022 to June 2025 and as Chief Technology Officer and

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Executive Vice President of Asset Management from April 2020 to May 2022. Before joining the Company, Mr. Blakely worked with venture capital and private equity funds specializing in energy,
supporting teams in developing, commercializing and scaling technology businesses. Mr. Blakely holds a Bachelor of Science in Economics from Duke University and an MBA from MIT’s Sloan School of Management.