Posts of Stephen Prybeck

Song brings deep technology, cybersecurity, software, edge computing, and digital infrastructure expertise as Eos scales American-made energy storage for an increasingly complex grid

Pittsburgh-based Martin brings two decades of legal and governance leadership at global industrial companies to strengthen Eos’ foundation as it scales U.S. manufacturing and commercial deployment

PITTSBURGH, July 09, 2026 (GLOBE NEWSWIRE) — Eos Energy Enterprises, Inc. (NASDAQ: EOSE) (“Eos” or the “Company”), America’s leading innovator in designing, manufacturing, and providing zinc-based long-duration energy storage (LDES) systems sourced and manufactured in the United States, today announced the appointment of Haiyan Song to its Board of Directors and a planned leadership transition of the Company’s Chief Legal Officer.

The announcements come as Eos scales U.S. manufacturing and accelerates commercial deployments. The Company is building the technology, talent, and governance foundation to lead in an energy storage market being reshaped by surging electricity demand, tightening grid constraints, and the growing role of data, software, and cybersecurity in how storage systems are built, secured and operated.

Board Appointment
Song brings more than three decades leading software, cloud, cybersecurity, data, and enterprise technology businesses, most recently as Executive Vice President of NetApp’s CloudOps business, with prior senior leadership roles at F5, Splunk and Hewlett Packard Enterprise spanning product, engineering, cloud, cybersecurity and go-to-market functions at global scale. She also brings public and private board experience through her service on the boards of CSG and Kodiak Solutions.

Her appointment will strengthen Eos’ software, data, and cybersecurity strategy. Song’s software and edge computing expertise will support Eos as storage systems increasingly operate as intelligent assets at the grid edge, processing data and making operating decisions closer to where power is stored and delivered through platforms like the Company’s DawnOS™ operating system.

“Eos has built a differentiated energy storage platform backed by strong technology and manufacturing capabilities in a market that is becoming increasingly important to the future of American energy infrastructure,” said Song. “As energy storage systems continue to evolve, software, data and analytics will play a larger role in performance, operations and customer experience. I look forward to working with the Board and leadership team as Eos executes its strategy.”

“Haiyan brings proven cybersecurity, cloud and software expertise to our Board,” said Joe Nigro, Chairman of the Board. “Her perspective complements the manufacturing, industrial and energy expertise already on our Board, and will directly strengthen how we build, secure and operate our platform as Eos scales.”

As part of the Board transition, Greg Nixon has elected to step down from his role as a preferred stock director. Nate Fick, who joined the Board in March 2026, will transition from his independent director seat to the preferred stock director seat. Song will join the Board as an independent director, filling the seat vacated by Fick, effective July 9, 2026. Following these changes, the size of the Board, the number of independent directors, and the number of preferred stock directors remain unchanged.

“Greg has been a respected colleague and valued contributor to the Board, and we are grateful for his service,” added Nigro. “His insight and commitment helped guide Eos through a period of significant manufacturing expansion and governance advancement. He helped build a strong and enduring foundation for the Company’s partnership with Cerberus that carries forward as Nate assumes the preferred stock director seat.”

“I’ve watched Eos transform into a company built to lead in this industry, and it’s been rewarding to be part of that progress,” said Nixon. “Eos has gone from a company proving out its technology to one manufacturing at scale in the U.S. That’s a hard transition to make, and this team has made it.”

Chief Legal Officer Transition
Eos also announced the appointment of Marie Batz Martin as Chief Legal Officer effective July 13, 2026, bringing more than 20 years of legal, compliance and corporate governance leadership at global industrial and manufacturing companies to a business moving fast on multiple fronts. Michael Silberman, Eos’ current Chief Legal Officer, will remain with the Company as a non-executive employee through September 11, 2026, in support of the planned smooth transition.

Martin most recently served as Global Vice President and Chief Compliance Officer at Coherent Corp., where she led global compliance programs and business integration across a multi-billion-dollar enterprise. She previously served as Executive Vice President, General Counsel, Corporate Secretary and Chief Compliance Officer at FlightSafety International, and spent more than a decade at Alcoa and Arconic advising executive leadership on strategic transactions, regulatory matters, and large-scale manufacturing initiatives.

“Marie has built high-performing teams and advised complex global businesses through periods of growth and operational change,” said Joe Mastrangelo, Eos Chief Executive Officer. “She brings the legal expertise, judgment, and public-company experience Eos needs as we execute our strategy and scale the business.”

“What stands out about Eos is its pace of execution and the opportunity to help build a company at a defining stage of growth,” said Martin. “I’m looking forward to partnering across the business to keep that momentum building.”

Silberman leaves after steering Eos’ legal organization through a pivotal period, helping execute several of the Company’s most important strategic, financing, and operational initiatives, including procuring the U.S. Department of Energy loan, securing the Cerberus Capital Management LP strategic investment, and launching Frontier Power USA. His leadership and counsel helped strengthen the Company’s foundation and position Eos for its current phase of commercial and operational execution.

“It has been a privilege to be part of Eos’ journey through several pivotal years,” said Silberman. “I have tremendous confidence in the Company’s future and believe in the value of having legal leadership based in Pittsburgh to be closely connected to the business and its operations.”

“We thank Michael for his leadership, partnership, and significant contributions to Eos over the years,” added Mastrangelo. “His counsel and commitment were pivotal in guiding the Company through an important chapter in our evolution, and we are grateful for his dedicated service and lasting impact. We wish Michael and his family all the best in this next chapter.”

About Eos Energy Enterprises
Eos is accelerating the shift to American energy independence with positively ingenious solutions that transform how the world stores power. The Company’s BESS features the innovative Znyth™ technology, a proven chemistry with readily available non-precious earth components, that is the pre-eminent safe, non-flammable, secure, stable, and scalable alternative to conventional technology. The Company’s BESS is ideal for utility-scale, microgrid, commercial, and industrial long-duration energy storage applications (i.e., 4 to 16+ hours) and provides customers with significant operational flexibility to cost effectively address current and future increased grid demand and complexity. For more information about Eos (NASDAQ: EOSE), visit eose.com.

Forward Looking Statements

Except for the historical information contained herein, the matters set forth in this press release are forward-looking statements within the meaning of the “safe harbor” provisions of the Private Securities Litigation Reform Act of 1995. Forward-looking statements include, but are not limited to, statements that refer to outlook, projections, forecasts or other characterizations of future events or circumstances, including any underlying assumptions. The words “anticipate,” “believe,” “continue,” “could,” “estimate,” “expect,” “intends,” “may,” “might,” “plan,” “possible,” “potential,” “predict,” “project,” “should,” “would” and similar expressions may identify forward-looking statements, but the absence of these words does not mean that a statement is not forward-looking. Forward-looking statements are based on our management’s beliefs, as well as assumptions made by, and the information currently available to, them. Because such statements are based on expectations as to future financial and operating results and are not statements of fact, actual results may differ materially from those projected.

Factors which may cause actual results to differ materially from current expectations include, but are not limited to: changes adversely affecting the business in which we are engaged; our ability to forecast trends accurately; our ability to generate cash, service indebtedness and incur additional indebtedness; our ability to achieve the operational milestones on the delayed draw term loan; our ability to raise financing in the future; risks associated with the credit agreement with Cerberus, including risks of default, dilution of outstanding Common Stock, consequences for failure to meet milestones and contractual lockup of shares; our customers’ ability to secure project financing; the amount of final tax credits available to our customers or to Eos pursuant to the Inflation Reduction Act; the timing and availability of future funding under the Department of Energy Loan Facility; our ability to continue to develop efficient manufacturing processes to scale and to forecast related costs and efficiencies accurately; fluctuations in our revenue and operating results; competition from existing or new competitors; our ability to convert firm order backlog and pipeline to revenue; risks associated with security breaches in our information technology systems; risks related to legal proceedings or claims; risks associated with evolving energy policies in the United States and other countries and the potential costs of regulatory compliance; risks associated with changes to the U.S. trade environment; our ability to maintain the listing of our shares of common stock on NASDAQ; our ability to grow our business and manage growth profitably, maintain relationships with customers and suppliers and retain our management and key employees; risks related to the adverse changes in general economic conditions, including inflationary pressures and increased interest rates; risk from supply chain disruptions and other impacts of geopolitical conflict; changes in applicable laws or regulations; the possibility that Eos may be adversely affected by other economic, business, and/or competitive factors; other factors beyond our control; risks related to adverse changes in general economic conditions; and other risks and uncertainties.

The forward-looking statements contained in this press release are also subject to additional risks, uncertainties, and factors, including those more fully described in the Company’s most recent filings with the Securities and Exchange Commission, including the Company’s most recent Annual Report on Form 10-K and subsequent reports on Forms 10-Q and 8-K. Further information on potential risks that could affect actual results will be included in the subsequent periodic and current reports and other filings that the Company makes with the Securities and Exchange Commission from time to time. Moreover, the Company operates in a very competitive and rapidly changing environment, and new risks and uncertainties may emerge that could have an impact on the forward-looking statements contained in this press release.

Forward-looking statements speak only as of the date they are made. Readers are cautioned not to put undue reliance on forward-looking statements, and, except as required by law, the Company assumes no obligation and does not intend to update or revise these forward-looking statements, whether as a result of new information, future events, or otherwise.

EDISON, N.J., July 09, 2026 (GLOBE NEWSWIRE) — Eos Energy Enterprises, Inc. (NASDAQ: EOSE) (“Eos” or the “Company”), America’s leading innovator in designing, manufacturing, and providing zinc-based long duration energy storage (LDES) systems sourced and manufactured in the United States, today announced that it has made available a virtual investor presentation through NetRoadshow related to the previously announced offering of subscription rights. The virtual investor presentation may be accessed on NetRoadshow at Rights Offering NetRoadshow and will be available until the rights offering expires at 5:00 p.m., New York City time, on July 21, 2026.

For additional resources, visit Eos Rights Offering regarding the rights offering.

The Company is conducting the rights offering pursuant to an effective shelf registration statement, including a base prospectus, under the Securities Act. The rights offering is being made only by means of a separate prospectus supplement (and the accompanying base prospectus), which contains the detailed terms of the rights offering and has been filed with the SEC on July 2, 2026. Copies of the prospectus supplement and accompanying prospectus relating to the rights offering may be obtained for free by visiting the Securities and Exchange Commission’s website at www.sec.gov.

Questions about the rights offering and requests for copies of the prospectus relating to the rights offering may be directed to Sodali & Co., the Company’s information agent for the rights offering, at the address and phone number provided at the end of this release. The completion of the rights offering remains subject to the satisfaction of certain conditions, and the Company reserves the right to amend or terminate the rights offering at any time prior to the expiration date of the rights offering.

This press release does not constitute an offer to sell or the solicitation of an offer to buy any securities, nor will there be any sale of securities in any state or other jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state or jurisdiction.

About Eos Energy Enterprises

Eos is accelerating the shift to American energy independence with positively ingenious solutions that transform how the world stores power. The Company’s BESS features the innovative Znyth™ technology, a proven chemistry with readily available non-precious earth components, that is the pre-eminent safe, non-flammable, secure, stable, and scalable alternative to conventional technology. The Company’s BESS is ideal for utility-scale, microgrid, commercial, and industrial long-duration energy storage applications (i.e., 4 to 16+ hours), and provides customers with significant operational flexibility to effectively address current and future increased grid demand and complexity.

Contacts

Information Agent
Sodali & Co.
(203) 658-9400 (For Banks and Brokers)
(833) 225-0490 (Toll Free)
EOSE.info@investor.sodali.com

Forward Looking Statements and Important Information

Except for the historical information contained herein, the matters set forth in this press release are forward-looking statements within the meaning of the “safe harbor” provisions of the Private Securities Litigation Reform Act of 1995. Forward-looking statements include, but are not limited to, statements regarding the Rights Distribution, the rights offering, and our contemplated investment in Frontier Power USA. The words “anticipate,” “believe,” “continue,” “could,” “estimate,” “expect,” “intends,” “may,” “might,” “plan,” “possible,” “potential,” “predict,” “project,” “should,” “would” and similar expressions may identify forward-looking statements, but the absence of these words does not mean that a statement is not forward-looking. Forward-looking statements are based on our management’s beliefs, as well as assumptions made by, and information currently available to, them. Because such statements are based on expectations as to future results and are not statements of fact, actual results may differ materially from those projected.

Factors which may cause actual results to differ materially from current expectations include, but are not limited to: changes adversely affecting the business in which we are engaged; our ability to forecast trends accurately; our ability to generate cash, service indebtedness and incur additional indebtedness; our ability to raise financing in the future; our ability to obtain stockholder approval of an increase to our authorized common stock; our ability to complete a rights offering to raise funds for purposes of capitalizing Frontier Power USA, including satisfying applicable conditions to the rights offering; risks associated with the joint venture, including the risk that the joint venture will not be completed on the anticipated terms if at all; risks associated with the credit agreement with Cerberus, including risks of default, and dilution of outstanding common stock; our customers’ ability to secure project financing; the amount of final tax credits available to our customers or to Eos pursuant to the Inflation Reduction Act, including potential impacts from any repeal or modifications of the legislation; the timing and availability of future funding under the Department of Energy Loan Facility; our ability to continue to develop efficient manufacturing processes to scale and to forecast related costs and efficiencies accurately; fluctuations in our revenue and operating results; competition from existing or new competitors; our ability to convert firm order backlog and pipeline to revenue; risks associated with security breaches in our information technology systems; risks related to legal proceedings or claims; risks associated with evolving energy policies in the United States and other countries and the potential costs of regulatory compliance; risks associated with changes to the U.S. trade environment; our ability to maintain the listing of our shares of common stock on NASDAQ; our ability to grow our business and manage growth profitably, maintain relationships with customers and suppliers and retain our management and key employees; risks related to adverse changes in general economic conditions, including inflationary pressures and increased interest rates; risk from supply chain disruptions and other impacts of geopolitical conflict; changes in applicable laws or regulations; the possibility that Eos may be adversely affected by other economic, business, and/or competitive factors; other factors beyond our control; risks related to adverse changes in general economic conditions; and other risks and uncertainties indicated.

The forward-looking statements contained in this press release are also subject to additional risks, uncertainties, and factors, including those more fully described in the Company’s most recent filings with the Securities and Exchange Commission, including the Company’s most recent Annual Report on Form 10-K and subsequent reports on Forms 10-Q and 8-K. Further information on potential risks that could affect actual results will be included in the subsequent periodic and current reports and other filings that the Company makes with the Securities and Exchange Commission from time to time. Moreover, the Company operates in a very competitive and rapidly changing environment, and new risks and uncertainties may emerge that could have an impact on the forward-looking statements contained in this press release.

Forward-looking statements speak only as of the date they are made. Should one or more of these risks or uncertainties materialize or should any of our assumptions prove incorrect, actual results may vary in material respects from those projected in these forward-looking statements. Readers are cautioned not to put undue reliance on forward-looking statements, and, except as required by law, the Company assumes no obligation and does not intend to update or revise these forward-looking statements, whether as a result of new information, future events, or otherwise.

EDISON, N.J., July 02, 2026 (GLOBE NEWSWIRE) — Eos Energy Enterprises, Inc. (NASDAQ: EOSE) (“Eos” or the “Company”), America’s leading innovator in designing, manufacturing, and providing zinc-based long duration energy storage (LDES) systems sourced and manufactured in the United States, today announced that it has commenced its previously announced offering of subscription rights (the “Rights”) to holders of its common stock and holders of its warrants to purchase common stock issued on April 14, 2023, May 17, 2023, December 19, 2023 and November 21, 2025 (collectively, “Eligible Holders”) as of July 1, 2026 (the “Record Date”).

Pursuant to the rights offering, the Company will distribute Rights to acquire an aggregate of 27,367,171 units (the “Units”) on July 2, 2026 (the “Distribution Date”) at a price per Unit of $5.481 to the Eligible Holders as of the Record Date. Each Unit consists of one share of the Company’s common stock and 0.4388 of a warrant to purchase one share of the Company’s common stock at an exercise price of $5.481 per whole share. Further details on the terms and conditions of the warrants are described in the offering documents. The rights offering includes an over-subscription privilege to permit each Eligible Holder that exercises its basic subscription rights in full to purchase additional Units up to the number of Units underlying its basic subscription right (or 200% combined) that remain unsubscribed on the expiration date for the offering (if any), subject to the availability and allocation of Units among persons exercising this over-subscription privilege and certain other limitations as described in the offering documents.

The Company intends to use the net proceeds of the Rights Offering, if any, to fund its previously announced investment in Frontier Power USA Parent, LLC (“Frontier”).

The pricing of the rights offering is summarized below:

• 1 share or participating warrant held on the Record Date = 1 Right
• 1 Right = 0.071193 of a Unit exercisable at a price of $5.481 per whole Unit
  • As otherwise stated, each Eligible Holder will receive a Right to acquire one Unit at $5.481 for every ~14 shares or participating warrants held
• 1 Unit = 1 share of common stock + 0.4388 of a warrant, each whole warrant exercisable for 1 share of common stock at an exercise price of $5.481 per share

The Company has applied to have the Rights admitted to trading on the Nasdaq Capital Market, where it expects them to begin trading under the symbol “EOSER” on July 6, 2026. The Company has also applied to have the Warrants admitted to trading on the Nasdaq Capital Market under the symbol “EOSEW”. However, no assurance can be given that such listing application will be approved. The rights offering will expire at 5:00 p.m., New York City time, on July 21, 2026. Further details on the terms of the rights offering and the procedures pursuant to which Eligible Holders can exercise their rights and the transferability of such rights, are described in the offering documents.

With respect to the rights distribution, Broadridge is expected to complete the issuance on the Distribution Date. Shareholders who hold their shares through a bank or brokerage account should see the rights credited to their accounts after their financial institution completes its internal processing and distribution procedures. The timing of receipt may vary among each bank and brokerage firm.

See Eos Rights Offering for shareholder resources regarding the rights offering. The Company expects to host a virtual investor presentation through NetRoadshow during the week of July 6, 2026. Additional details will be provided when available.

The Company is conducting the rights offering pursuant to an effective shelf registration statement, including a base prospectus, under the Securities Act. The rights offering is being made only by means of a separate prospectus supplement (and the accompanying base prospectus), which contains the detailed terms of the rights offering and has been filed with the SEC on July 2, 2026. Copies of the prospectus supplement and accompanying prospectus relating to the rights offering may be obtained for free by visiting the Securities and Exchange Commission’s website at www.sec.gov. Questions about the rights offering and requests for copies of the prospectus relating to the rights offering may be directed to Sodali & Co., the Company’s information agent for the rights offering, at the address and phone number provided at the end of this release. The completion of the rights offering remains subject to the satisfaction of certain conditions, and the Company reserves the right to amend or terminate the rights offering at any time prior to the expiration date of the rights offering.

This press release does not constitute an offer to sell or the solicitation of an offer to buy any securities, nor will there be any sale of securities in any state or other jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state or jurisdiction.

About Eos Energy Enterprises

Eos is accelerating the shift to American energy independence with positively ingenious solutions that transform how the world stores power. The Company’s BESS features the innovative Znyth™ technology, a proven chemistry with readily available non-precious earth components, that is the pre-eminent safe, non-flammable, secure, stable, and scalable alternative to conventional technology. The Company’s BESS is ideal for utility-scale, microgrid, commercial, and industrial long-duration energy storage applications (i.e., 4 to 16+ hours), and provides customers with significant operational flexibility to effectively address current and future increased grid demand and complexity.

Contacts
Eos Energy Enterprises, Inc.

Information Agent

Sodali & Co.
(203) 658-9400 (For Banks and Brokers)
(833) 225-0490 (Toll Free)
EOSE.info@investor.sodali.com

Forward Looking Statements and Important Information

Except for the historical information contained herein, the matters set forth in this press release are forward-looking statements within the meaning of the “safe harbor” provisions of the Private Securities Litigation Reform Act of 1995. Forward-looking statements include, but are not limited to, statements regarding the Rights Distribution, the rights offering, and our contemplated investment in Frontier Power USA. The words “anticipate,” “believe,” “continue,” “could,” “estimate,” “expect,” “intends,” “may,” “might,” “plan,” “possible,” “potential,” “predict,” “project,” “should,” “would” and similar expressions may identify forward-looking statements, but the absence of these words does not mean that a statement is not forward-looking. Forward-looking statements are based on our management’s beliefs, as well as assumptions made by, and information currently available to, them. Because such statements are based on expectations as to future results and are not statements of fact, actual results may differ materially from those projected.

Factors which may cause actual results to differ materially from current expectations include, but are not limited to: changes adversely affecting the business in which we are engaged; our ability to forecast trends accurately; our ability to generate cash, service indebtedness and incur additional indebtedness; our ability to raise financing in the future; our ability to obtain stockholder approval of an increase to our authorized common stock; our ability to complete a rights offering to raise funds for purposes of capitalizing Frontier Power USA, including satisfying applicable conditions to the rights offering; risks associated with the joint venture, including the risk that the joint venture will not be completed on the anticipated terms if at all; risks associated with the credit agreement with Cerberus, including risks of default, and dilution of outstanding common stock; our customers’ ability to secure project financing; the amount of final tax credits available to our customers or to Eos pursuant to the Inflation Reduction Act, including potential impacts from any repeal or modifications of the legislation; the timing and availability of future funding under the Department of Energy Loan Facility; our ability to continue to develop efficient manufacturing processes to scale and to forecast related costs and efficiencies accurately; fluctuations in our revenue and operating results; competition from existing or new competitors; our ability to convert firm order backlog and pipeline to revenue; risks associated with security breaches in our information technology systems; risks related to legal proceedings or claims; risks associated with evolving energy policies in the United States and other countries and the potential costs of regulatory compliance; risks associated with changes to the U.S. trade environment; our ability to maintain the listing of our shares of common stock on NASDAQ; our ability to grow our business and manage growth profitably, maintain relationships with customers and suppliers and retain our management and key employees; risks related to adverse changes in general economic conditions, including inflationary pressures and increased interest rates; risk from supply chain disruptions and other impacts of geopolitical conflict; changes in applicable laws or regulations; the possibility that Eos may be adversely affected by other economic, business, and/or competitive factors; other factors beyond our control; risks related to adverse changes in general economic conditions; and other risks and uncertainties indicated.

The forward-looking statements contained in this press release are also subject to additional risks, uncertainties, and factors, including those more fully described in the Company’s most recent filings with the Securities and Exchange Commission, including the Company’s most recent Annual Report on Form 10-K and subsequent reports on Forms 10-Q and 8-K. Further information on potential risks that could affect actual results will be included in the subsequent periodic and current reports and other filings that the Company makes with the Securities and Exchange Commission from time to time. Moreover, the Company operates in a very competitive and rapidly changing environment, and new risks and uncertainties may emerge that could have an impact on the forward-looking statements contained in this press release.
Forward-looking statements speak only as of the date they are made. Should one or more of these risks or uncertainties materialize or should any of our assumptions prove incorrect, actual results may vary in material respects from those projected in these forward-looking statements. Readers are cautioned not to put undue reliance on forward-looking statements, and, except as required by law, the Company assumes no obligation and does not intend to update or revise these forward-looking statements, whether as a result of new information, future events, or otherwise.

EDISON, N.J., June 30, 2026 (GLOBE NEWSWIRE) — Eos Energy Enterprises, Inc. (NASDAQ: EOSE) (“Eos” or the “Company”) today announced that it has commenced a registered direct offering (the “Offering”) of common stock and warrants. The Offering is being made pursuant to the Securities Act of 1933, as amended (the “Securities Act”). The Offering is subject to market and other conditions, and there can be no assurance as to whether or when the Offering may be completed, if at all, or as to the actual size or terms of the Offering.

Eos expects to use the net proceeds from the Offering as well as any proceeds from its proposed rights offering to fund its contribution to Frontier Power USA Parent, LLC. The closing of this Offering is subject to customary closing conditions.

The Company is conducting the Offering pursuant to an effective shelf registration statement, including a base prospectus, under the Securities Act. The Offering is being made only by means of a separate prospectus supplement and the accompanying prospectus. Copies of the preliminary prospectus supplement and accompanying prospectus relating to the Offering may be obtained by contacting the Company at ir@eose.com. Before you invest in the Offering, you should read the applicable prospectus supplement relating to the Offering and accompanying prospectus, the registration statement and the other documents that the Company has filed with the Securities and Exchange Commission (the “SEC”) as incorporated by reference therein, for more complete information about the Company and the Offering. Investors may obtain these documents for free by visiting the SEC’s website at www.sec.gov.

This press release shall not constitute an offer to sell, or a solicitation of an offer to buy any securities, nor shall there be any sale of any securities in any state or jurisdiction in which such an offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state or jurisdiction.

About Eos Energy Enterprises

Eos is accelerating the shift to American energy independence with positively ingenious solutions that transform how the world stores power. The Company’s BESS features the innovative Znyth™ technology, a proven chemistry with readily available non-precious earth components, that is the pre-eminent safe, non-flammable, secure, stable, and scalable alternative to conventional technology. The Company’s BESS is ideal for utility-scale, microgrid, commercial, and industrial long-duration energy storage applications (i.e., 4 to 16+ hours), and provides customers with significant operational flexibility to effectively address current and future increased grid demand and complexity.

Contacts
Investors: ir@eose.com
Media: media@eose.com

Forward-Looking Statements

Except for the historical information contained herein, the matters set forth in this press release are forward-looking statements within the meaning of the “safe harbor” provisions of the Private Securities Litigation Reform Act of 1995. Forward-looking statements include, but are not limited to, statements regarding the Rights Distribution, the rights offering, and our contemplated investment in Frontier Power USA. The words “anticipate,” “believe,” “continue,” “could,” “estimate,” “expect,” “intends,” “may,” “might,” “plan,” “possible,” “potential,” “predict,” “project,” “should,” “would” and similar expressions may identify forward-looking statements, but the absence of these words does not mean that a statement is not forward-looking. Forward-looking statements are based on our management’s beliefs, as well as assumptions made by, and information currently available to, them. Because such statements are based on expectations as to future results and are not statements of fact, actual results may differ materially from those projected.

Factors which may cause actual results to differ materially from current expectations include, but are not limited to: changes adversely affecting the business in which we are engaged; our ability to forecast trends accurately; our ability to generate cash, service indebtedness and incur additional indebtedness; our ability to raise financing in the future; our ability to obtain stockholder approval of an increase to our authorized common stock; our ability to complete a rights offering to raise funds for purposes of capitalizing Frontier Power USA, including satisfying applicable conditions to the rights offering; risks associated with the joint venture, including the risk that the joint venture will not be completed on the anticipated terms if at all; risks associated with the credit agreement with Cerberus, including risks of default, and dilution of outstanding common stock; our customers’ ability to secure project financing; the amount of final tax credits available to our customers or to Eos pursuant to the Inflation Reduction Act, including potential impacts from any repeal or modifications of the legislation; the timing and availability of future funding under the Department of Energy Loan Facility; our ability to continue to develop efficient manufacturing processes to scale and to forecast related costs and efficiencies accurately; fluctuations in our revenue and operating results; competition from existing or new competitors; our ability to convert firm order backlog and pipeline to revenue; risks associated with security breaches in our information technology systems; risks related to legal proceedings or claims; risks associated with evolving energy policies in the United States and other countries and the potential costs of regulatory compliance; risks associated with changes to the U.S. trade environment; our ability to maintain the listing of our shares of common stock on NASDAQ; our ability to grow our business and manage growth profitably, maintain relationships with customers and suppliers and retain our management and key employees; risks related to adverse changes in general economic conditions, including inflationary pressures and increased interest rates; risk from supply chain disruptions and other impacts of geopolitical conflict; changes in applicable laws or regulations; the possibility that Eos may be adversely affected by other economic, business, and/or competitive factors; other factors beyond our control; risks related to adverse changes in general economic conditions; and other risks and uncertainties indicated.

The forward-looking statements contained in this press release are also subject to additional risks, uncertainties, and factors, including those more fully described in the Company’s most recent filings with the Securities and Exchange Commission, including the Company’s most recent Annual Report on Form 10-K and subsequent reports on Forms 10-Q and 8-K. Further information on potential risks that could affect actual results will be included in the subsequent periodic and current reports and other filings that the Company makes with the Securities and Exchange Commission from time to time. Moreover, the Company operates in a very competitive and rapidly changing environment, and new risks and uncertainties may emerge that could have an impact on the forward-looking statements contained in this press release.

Forward-looking statements speak only as of the date they are made. Should one or more of these risks or uncertainties materialize or should any of our assumptions prove incorrect, actual results may vary in material respects from those projected in these forward-looking statements. Readers are cautioned not to put undue reliance on forward-looking statements, and, except as required by law, the Company assumes no obligation and does not intend to update or revise these forward-looking statements, whether as a result of new information, future events, or otherwise.

EDISON, N.J., June 30, 2026 (GLOBE NEWSWIRE) — Eos Energy Enterprises, Inc. (NASDAQ: EOSE) (“Eos” or the “Company”) today announced the pricing of a registered direct offering (the “Offering”) to Hudson Bay Capital Management of 13,683,634 shares of our common stock, par value $0.0001 per share, and 6,004,378 warrants, each warrant to purchase one share of common stock at an exercise price of $5.481 per share. Each share of common stock is being offered and sold together with 0.4388 of an accompanying Warrant at an aggregate offering price of $5.481. The Offering is being made pursuant to the Securities Act of 1933, as amended (the “Securities Act”). The Offering is expected to close on July 1, 2026, subject to customary closing conditions.

The proceeds from the Offering are expected to be approximately $75 million (excluding any future exercise of warrants). Eos expects to use the net proceeds from the Offering as well as any proceeds from its proposed rights offering to fund its contribution to Frontier Power USA Parent, LLC (“FPUSA”). The closing of this Offering is subject to customary closing conditions.

Hudson Bay Capital Management has also committed to invest $50 million directly into FPUSA, subject to certain conditions. The commitment brings FPUSA’s expected equity investment up to approximately $375 million, assuming full subscription in the Company’s proposed rights offering. Under FPUSA’s planned financing model, that equity base is expected to support more than $1.5 billion of deployable project capital at approximately 75% loan-to-value (LTV).

The additional capital supports strong customer demand and the continued expansion of FPUSA’s project pipeline. FPUSA has a robust pipeline of approximately 16 GWh of long-duration energy storage projects across key U.S. markets. Of this current pipeline, approximately 2.7 GWh represents high-probability conversion opportunities, including approximately 1.2 GWh expected to be ready to sign, with a portion anticipated to reach notice to proceed in the near term, creating opportunities for capital deployment.

Eos and FPUSA hold a previously announced 2 GWh manufacturing capacity reservation agreement, of which approximately 25% is already allocated to projects advancing toward execution. By combining project development, dedicated manufacturing capacity, financing, and execution under one platform, FPUSA is designed to convert late-stage opportunities into operating assets. Structured on arm’s-length commercial terms, this model is expected to drive increased demand for Eos’ Z3™ technology and enhance the Company’s ability to participate in the long-term value generated by project deployments.

The Company is conducting the Offering pursuant to an effective shelf registration statement, including a base prospectus, under the Securities Act. The Offering is being made only by means of a separate prospectus supplement and the accompanying prospectus. Copies of the preliminary prospectus supplement and accompanying prospectus relating to the Offering may be obtained by contacting the Company at ir@eose.com. Before you invest in the Offering, you should read the applicable prospectus supplement relating to the Offering and accompanying prospectus, the registration statement and the other documents that the Company has filed with the Securities and Exchange Commission (the “SEC”) as incorporated by reference therein, for more complete information about the Company and the Offering. Investors may obtain these documents for free by visiting the SEC’s website at www.sec.gov.

This press release shall not constitute an offer to sell, or a solicitation of an offer to buy any securities, nor shall there be any sale of any securities in any state or jurisdiction in which such an offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state or jurisdiction. In addition, this press release does not constitute an offer to sell or the solicitation of an offer to buy any securities, including any securities in a rights offering.

About Eos Energy Enterprises

Eos is accelerating the shift to American energy independence with positively ingenious solutions that transform how the world stores power. The Company’s BESS features the innovative Znyth™ technology, a proven chemistry with readily available non-precious earth components, that is the pre-eminent safe, non-flammable, secure, stable, and scalable alternative to conventional technology. The Company’s BESS is ideal for utility-scale, microgrid, commercial, and industrial long-duration energy storage applications (i.e., 4 to 16+ hours), and provides customers with significant operational flexibility to effectively address current and future increased grid demand and complexity.

Contacts
Investors: ir@eose.com
Media: media@eose.com

Forward-Looking Statements

Except for the historical information contained herein, the matters set forth in this press release are forward-looking statements within the meaning of the “safe harbor” provisions of the Private Securities Litigation Reform Act of 1995. Forward-looking statements include, but are not limited to, statements regarding the Rights Distribution, the rights offering, and our contemplated investment in Frontier Power USA. The words “anticipate,” “believe,” “continue,” “could,” “estimate,” “expect,” “intends,” “may,” “might,” “plan,” “possible,” “potential,” “predict,” “project,” “should,” “would” and similar expressions may identify forward-looking statements, but the absence of these words does not mean that a statement is not forward-looking. Forward-looking statements are based on our management’s beliefs, as well as assumptions made by, and information currently available to, them. Because such statements are based on expectations as to future results and are not statements of fact, actual results may differ materially from those projected.

Factors which may cause actual results to differ materially from current expectations include, but are not limited to: changes adversely affecting the business in which we are engaged; our ability to forecast trends accurately; our ability to generate cash, service indebtedness and incur additional indebtedness; our ability to raise financing in the future; our ability to obtain stockholder approval of an increase to our authorized common stock; our ability to complete a rights offering to raise funds for purposes of capitalizing Frontier Power USA, including satisfying applicable conditions to the rights offering; risks associated with the joint venture, including the risk that the joint venture will not be completed on the anticipated terms if at all; risks associated with the credit agreement with Cerberus, including risks of default, and dilution of outstanding common stock; our customers’ ability to secure project financing; the amount of final tax credits available to our customers or to Eos pursuant to the Inflation Reduction Act, including potential impacts from any repeal or modifications of the legislation; the timing and availability of future funding under the Department of Energy Loan Facility; our ability to continue to develop efficient manufacturing processes to scale and to forecast related costs and efficiencies accurately; fluctuations in our revenue and operating results; competition from existing or new competitors; our ability to convert firm order backlog and pipeline to revenue; risks associated with security breaches in our information technology systems; risks related to legal proceedings or claims; risks associated with evolving energy policies in the United States and other countries and the potential costs of regulatory compliance; risks associated with changes to the U.S. trade environment; our ability to maintain the listing of our shares of common stock on NASDAQ; our ability to grow our business and manage growth profitably, maintain relationships with customers and suppliers and retain our management and key employees; risks related to adverse changes in general economic conditions, including inflationary pressures and increased interest rates; risk from supply chain disruptions and other impacts of geopolitical conflict; changes in applicable laws or regulations; the possibility that Eos may be adversely affected by other economic, business, and/or competitive factors; other factors beyond our control; risks related to adverse changes in general economic conditions; and other risks and uncertainties indicated.

The forward-looking statements contained in this press release are also subject to additional risks, uncertainties, and factors, including those more fully described in the Company’s most recent filings with the Securities and Exchange Commission, including the Company’s most recent Annual Report on Form 10-K and subsequent reports on Forms 10-Q and 8-K. Further information on potential risks that could affect actual results will be included in the subsequent periodic and current reports and other filings that the Company makes with the Securities and Exchange Commission from time to time. Moreover, the Company operates in a very competitive and rapidly changing environment, and new risks and uncertainties may emerge that could have an impact on the forward-looking statements contained in this press release.

Forward-looking statements speak only as of the date they are made. Should one or more of these risks or uncertainties materialize or should any of our assumptions prove incorrect, actual results may vary in material respects from those projected in these forward-looking statements. Readers are cautioned not to put undue reliance on forward-looking statements, and, except as required by law, the Company assumes no obligation and does not intend to update or revise these forward-looking statements, whether as a result of new information, future events, or otherwise.

EDISON, N.J., June 30, 2026 (GLOBE NEWSWIRE) — Eos Energy Enterprises, Inc. (NASDAQ: EOSE) (“Eos” or the “Company”), America’s leading innovator in designing, manufacturing, and providing zinc-based long duration energy storage (LDES) systems sourced and manufactured in the United States, today announced certain updated terms of a distribution (the “Rights Distribution”) of subscription rights to holders of its common stock and holders of its warrants to purchase common stock issued on April 14, 2023, May 17, 2023, December 19, 2023 and November 21, 2025 (collectively, “Eligible Holders”) to acquire shares of the Company’s common stock and warrants to purchase shares of the Company’s common stock in a rights offering to fund the Company’s previously announced capital contribution in the Frontier Power USA joint venture.

In the rights offering, the Company expects to distribute rights to acquire a number of units, comprised of the Company’s common stock and warrants (the “Units”). As previously announced, the record date for the Rights Distribution will be at 5:00 pm New York time on July 1, 2026 (the “Record Date”) and the distribution date for the Rights Distribution will be on July 2, 2026.

Each right is expected to entitle an Eligible Holder to purchase, pursuant to the basic subscription privilege, approximately 0.0714 of a Unit at a subscription price equal to $5.481 per whole Unit, an approximate 10% discount to the closing price of the Company’s common stock on June 29, 2026. Each Unit shall consist of one share of our common stock and 0.4388 of a Warrant, with each whole warrant entitling the holder to purchase one share of our common stock at an exercise price of $5.481 per share, subject to adjustment. The exact number of Units that each right entitles an Eligible Holder to purchase will be calculated as of the Record Date. The expected pricing terms are consistent with the pricing terms of the Company’s previously announced registered direct offering.

The rights offering will include an over-subscription privilege to permit each Eligible Holder that exercises its basic subscription rights in full to purchase additional Units (if any) that remain unsubscribed on the expiration date for the offering, subject to certain restrictions. Further details on the terms of the rights offering and the procedures pursuant to which Eligible Holders can exercise their rights and the transferability of such rights, will be announced at the commencement of the rights offering. Following the commencement of the rights offering, the Company expects to provide additional investor communications in accordance with applicable securities laws and regulations.

The rights offering will be made pursuant to the Company’s existing effective shelf registration statement on Form S-3 on file with the Securities and Exchange Commission (the “SEC”) and a prospectus supplement (and the accompanying base prospectus) to be filed with the SEC prior to the commencement of the rights offering. The completion of the rights offering remains subject to the satisfaction of certain conditions, and the Company reserves the right to amend or terminate the rights offering at any time prior to the expiration date of the rights offering.

About Eos Energy Enterprises

Eos is accelerating the shift to American energy independence with positively ingenious solutions that transform how the world stores power. The Company’s BESS features the innovative Znyth™ technology, a proven chemistry with readily available non-precious earth components, that is the pre-eminent safe, non-flammable, secure, stable, and scalable alternative to conventional technology. The Company’s BESS is ideal for utility-scale, microgrid, commercial, and industrial long-duration energy storage applications (i.e., 4 to 16+ hours), and provides customers with significant operational flexibility to effectively address current and future increased grid demand and complexity.

Contacts
Investors:            ir@eose.com
Media:                 media@eose.com

Forward Looking Statements and Important Information

Except for the historical information contained herein, the matters set forth in this press release are forward-looking statements within the meaning of the “safe harbor” provisions of the Private Securities Litigation Reform Act of 1995. Forward-looking statements include, but are not limited to, statements regarding the Rights Distribution, the rights offering, and our contemplated investment in Frontier Power USA. The words “anticipate,” “believe,” “continue,” “could,” “estimate,” “expect,” “intends,” “may,” “might,” “plan,” “possible,” “potential,” “predict,” “project,” “should,” “would” and similar expressions may identify forward-looking statements, but the absence of these words does not mean that a statement is not forward-looking. Forward-looking statements are based on our management’s beliefs, as well as assumptions made by, and information currently available to, them. Because such statements are based on expectations as to future results and are not statements of fact, actual results may differ materially from those projected.

Factors which may cause actual results to differ materially from current expectations include, but are not limited to: changes adversely affecting the business in which we are engaged; our ability to forecast trends accurately; our ability to generate cash, service indebtedness and incur additional indebtedness; our ability to raise financing in the future; our ability to obtain stockholder approval of an increase to our authorized common stock; our ability to complete a rights offering to raise funds for purposes of capitalizing Frontier Power USA, including satisfying applicable conditions to the rights offering; risks associated with the joint venture, including the risk that the joint venture will not be completed on the anticipated terms if at all; risks associated with the credit agreement with Cerberus, including risks of default, and dilution of outstanding common stock; our customers’ ability to secure project financing; the amount of final tax credits available to our customers or to Eos pursuant to the Inflation Reduction Act, including potential impacts from any repeal or modifications of the legislation; the timing and availability of future funding under the Department of Energy Loan Facility; our ability to continue to develop efficient manufacturing processes to scale and to forecast related costs and efficiencies accurately; fluctuations in our revenue and operating results; competition from existing or new competitors; our ability to convert firm order backlog and pipeline to revenue; risks associated with security breaches in our information technology systems; risks related to legal proceedings or claims; risks associated with evolving energy policies in the United States and other countries and the potential costs of regulatory compliance; risks associated with changes to the U.S. trade environment; our ability to maintain the listing of our shares of common stock on NASDAQ; our ability to grow our business and manage growth profitably, maintain relationships with customers and suppliers and retain our management and key employees; risks related to adverse changes in general economic conditions, including inflationary pressures and increased interest rates; risk from supply chain disruptions and other impacts of geopolitical conflict; changes in applicable laws or regulations; the possibility that Eos may be adversely affected by other economic, business, and/or competitive factors; other factors beyond our control; risks related to adverse changes in general economic conditions; and other risks and uncertainties indicated.

The forward-looking statements contained in this press release are also subject to additional risks, uncertainties, and factors, including those more fully described in the Company’s most recent filings with the Securities and Exchange Commission, including the Company’s most recent Annual Report on Form 10-K and subsequent reports on Forms 10-Q and 8-K. Further information on potential risks that could affect actual results will be included in the subsequent periodic and current reports and other filings that the Company makes with the Securities and Exchange Commission from time to time. Moreover, the Company operates in a very competitive and rapidly changing environment, and new risks and uncertainties may emerge that could have an impact on the forward-looking statements contained in this press release.
Forward-looking statements speak only as of the date they are made. Should one or more of these risks or uncertainties materialize or should any of our assumptions prove incorrect, actual results may vary in material respects from those projected in these forward-looking statements. Readers are cautioned not to put undue reliance on forward-looking statements, and, except as required by law, the Company assumes no obligation and does not intend to update or revise these forward-looking statements, whether as a result of new information, future events, or otherwise.

This press release is for informational purposes only and does not constitute an offer to sell or the solicitation of an offer to buy any securities, including any securities in a rights offering. There shall be no offer to sell or the solicitation of an offer to buy or any sale of subscription rights, common stock, warrants or any other securities in any state or other jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state or other jurisdiction. The rights offering will be made pursuant to our effective shelf registration statement, including a base prospectus, under the Securities Act of 1933, as amended, and a prospectus supplement to be filed with the SEC which will contain information about the Company and the rights offering, and should be read carefully before any investment, and is subject to the receipt of certain consents under our existing debt agreements.

Additional institutional commitment brings Frontier Power USA’s targeted equity base up to approximately $375 million. Under the platform’s planned financing model, that equity is structured to support more than $1.5 billion of project deployment.

EDISON, N.J., June 30, 2026 (GLOBE NEWSWIRE) — Eos Energy Enterprises, Inc. (NASDAQ: EOSE) (“Eos” or the “Company”), a leading American innovator in zinc-based long-duration energy storage, today announced a $75 million equity investment from Hudson Bay Capital Management to support Eos’ investment in Frontier Power USA (“FPUSA”). Hudson Bay has also committed to invest $50 million directly into FPUSA, subject to certain conditions. The commitment brings FPUSA’s expected equity investment up to approximately $375 million, assuming full subscription in the Company’s proposed rights offering. Under FPUSA’s planned financing model, that equity base is expected to support more than $1.5 billion of deployable project capital at approximately 75% loan-to-value (LTV).

The Hudson Bay investment is additive to the previously announced $100 million commitment from Cerberus Capital Management and Eos’ own expected contribution of up to $150 million, which the Company intends to fund through the upcoming rights offering. Hudson Bay’s $75 million investment into Eos is being made on the same economic terms as the planned rights offering and is expected to allow its participation in the offering as a holder of record. By structuring the majority of Hudson Bay’s commitment on terms available to existing shareholders, the Company is aligning new institutional capital with its current investor base.

The Company is raising this capital to build FPUSA’s equity base, which, under its planned financing model, is expected to support project deployment at multiples of the invested capital. Eos is expected to retain an economic interest in FPUSA, with the size of that interest to be determined following completion of the rights offering and the level of shareholder participation.

The market for U.S.-manufactured long-duration energy storage continues to grow as customers seek solutions that improve grid reliability, support rising power demand, and enhance energy security. As projects move toward construction, developers increasingly need integrated solutions that combine development, manufacturing, financing, and execution. FPUSA was established to meet that need.

The additional capital supports strong customer demand and the continued expansion of FPUSA’s project pipeline. FPUSA has a robust pipeline of approximately 16 GWh of long-duration energy storage projects across key U.S. markets. Approximately 2.7 GWh of the pipeline represents high-probability conversion opportunities, including approximately 1.2 GWh expected to be ready to sign. A portion of those projects is anticipated to reach notice to proceed in the near term, creating opportunities for capital deployment.

By combining project development, dedicated manufacturing capacity, financing, and execution under one platform, FPUSA is designed to convert late-stage opportunities into operating assets. With arm’s length commercial terms, that model is expected to accelerate demand for Eos’ Z3™ technology and expands the Company’s participation in long-term project value.

FPUSA is moving quickly from platform formation into execution. Eos and FPUSA hold a previously announced 2 GWh manufacturing capacity reservation agreement, of which approximately 25% is already allocated to projects advancing toward execution. FPUSA has engaged KKR Capital Markets to build a scalable financing framework and has structured its portfolio to benefit from a $1.5 billion technology performance insurance policy from Ariel Green. Separately, FPUSA’s partnership with Stella Energy Solutions provides access to Stella’s 2 GWh utility-scale project pipeline and the execution capability to bring those projects into conversion.

“FPUSA was built to solve one problem: financing long-duration storage fast enough to match demand,” said Joe Mastrangelo, Eos Chief Executive Officer. “Most projects stall between contract and construction because financing can’t keep pace. Hudson Bay’s investment closes that gap, bringing FPUSA’s equity base to roughly $375 million and enabling the acceleration of project deployment. The FPUSA management team is well positioned to put this capital to work accelerating adoption of Eos’ zinc-based technology.”

“This investment reflects the confidence our partners have in both the market opportunity and FPUSA’s ability to execute, said Aaron Maczonis, Managing Director at Cerberus Capital Management. “FPUSA was designed to attract third-party capital into long-duration energy storage projects. The addition of Hudson Bay further validates the platform and expands our ability to finance and develop a growing portfolio of projects. As our pipeline continues to mature, bringing in institutional investors allows us to accelerate deployment while creating a scalable model for long-term growth.”

Shareholder Participation and Economic Alignment

Eos intends to fund its previously announced contribution of up to $150 million to FPUSA through the rights offering, giving eligible stockholders the opportunity to participate alongside institutional investors on substantially the same economic terms. The structure is intended to align shareholder participation with capital deployment into an execution-ready pipeline while preserving long-term upside through the combined value of a discounted investment in Eos common stock and additional warrant participation.

Goldman Sachs & Co. LLC served as sole financial advisor to Eos to assist the Company in its analysis and consideration of various financial alternatives available. Stifel served as the independent financial advisor to the Special Committee of Eos Energy’s Board of Directors.

About Eos Energy Enterprises

Eos is accelerating the shift to American energy independence with positively ingenious solutions that transform how the world stores power. The Company’s BESS features the innovative Znyth™ technology, a proven chemistry with readily available non-precious-earth components, that is a safe, secure, stable, and scalable alternative to conventional technology. The Company’s BESS is ideal for utility-scale, microgrid, commercial, and industrial long-duration energy storage applications (i.e., 4 to 16+ hours), and provides customers with significant operational flexibility to effectively address current and future increased grid demand and complexity. For more information about Eos (NASDAQ: EOSE), visit eose.com.

Contacts

Investors: ir@eose.com
Media: media@eose.com

Forward-Looking Statements

Except for the historical information contained herein, the matters set forth in this press release are forward-looking statements within the meaning of the “safe harbor” provisions of the Private Securities Litigation Reform Act of 1995. Forward-looking statements include, but are not limited to, statements regarding the Rights Distribution, the rights offering, the investments by Cerberus Capital Management and Hudson Bay Capital, and our contemplated investment in Frontier Power USA. The words “anticipate,” “believe,” “continue,” “could,” “estimate,” “expect,” “intends,” “may,” “might,” “plan,” “possible,” “potential,” “predict,” “project,” “should,” “would” and similar expressions may identify forward-looking statements, but the absence of these words does not mean that a statement is not forward-looking. Forward-looking statements are based on our management’s beliefs, as well as assumptions made by, and information currently available to, them. Because such statements are based on expectations as to future results and are not statements of fact, actual results may differ materially from those projected.

Factors which may cause actual results to differ materially from current expectations include, but are not limited to: changes adversely affecting the business in which we are engaged; our ability to forecast trends accurately; our ability to generate cash, service indebtedness and incur additional indebtedness; our ability to raise financing in the future; our ability to obtain stockholder approval of an increase to our authorized common stock; our ability to complete a rights offering to raise funds for purposes of capitalizing Frontier Power USA, including satisfying applicable conditions to the rights offering; risks associated with the joint venture, including the risk that the joint venture will not be completed on the anticipated terms if at all; the closing of the Hudson Bay investment; the expected capitalization for Frontier Power USA, risks associated with the credit agreement with Cerberus, including risks of default, and dilution of outstanding common stock; our customers’ ability to secure project financing; the amount of final tax credits available to our customers or to Eos pursuant to the Inflation Reduction Act, including potential impacts from any repeal or modifications of the legislation; the timing and availability of future funding under the Department of Energy Loan Facility; our ability to continue to develop efficient manufacturing processes to scale and to forecast related costs and efficiencies accurately; fluctuations in our revenue and operating results; competition from existing or new competitors; our ability to convert firm order backlog and pipeline to revenue; risks associated with security breaches in our information technology systems; risks related to legal proceedings or claims; risks associated with evolving energy policies in the United States and other countries and the potential costs of regulatory compliance; risks associated with changes to the U.S. trade environment; our ability to maintain the listing of our shares of common stock on NASDAQ; our ability to grow our business and manage growth profitably, maintain relationships with customers and suppliers and retain our management and key employees; risks related to adverse changes in general economic conditions, including inflationary pressures and increased interest rates; risk from supply chain disruptions and other impacts of geopolitical conflict; changes in applicable laws or regulations; the possibility that Eos may be adversely affected by other economic, business, and/or competitive factors; other factors beyond our control; risks related to adverse changes in general economic conditions; and other risks and uncertainties indicated.

The forward-looking statements contained in this press release are also subject to additional risks, uncertainties, and factors, including those more fully described in the Company’s most recent filings with the Securities and Exchange Commission, including the Company’s most recent Annual Report on Form 10-K and subsequent reports on Forms 10-Q and 8-K. Further information on potential risks that could affect actual results will be included in the subsequent periodic and current reports and other filings that the Company makes with the Securities and Exchange Commission from time to time. Moreover, the Company operates in a very competitive and rapidly changing environment, and new risks and uncertainties may emerge that could have an impact on the forward-looking statements contained in this press release.

Forward-looking statements speak only as of the date they are made. Should one or more of these risks or uncertainties materialize or should any of our assumptions prove incorrect, actual results may vary in material respects from those projected in these forward-looking statements. Readers are cautioned not to put undue reliance on forward-looking statements, and, except as required by law, the Company assumes no obligation and does not intend to update or revise these forward-looking statements, whether as a result of new information, future events, or otherwise.

Energy Safety Response Group testing found no thermal runaway, no sustained fire, and no propagation under direct flame impingement and overcharge abuse, supporting safe siting of long-duration storage in dense urban environments

Third-party testing addresses evolving NFPA 855 fire-test expectations and reinforces Eos’ differentiated safety profile

PITTSBURGH, June 22, 2026 (GLOBE NEWSWIRE) — Eos Energy Enterprises, Inc. (NASDAQ: EOSE) (“Eos” or the “Company”), America’s leading innovator in designing, manufacturing and providing zinc-based long-duration energy storage systems sourced and manufactured in the United States, today announced the results of independent destructive testing of its Eos Z3™ battery modules. Energy Safety Response Group (ESRG), an independent energy storage safety and fire testing organization, conducted testing equivalent to large-scale fire testing (LSFT). Under the conditions tested, the modules exhibited no thermal runaway, no sustained fire, and no propagation to adjacent live modules.

The 2026 edition of NFPA 855, the standard governing the installation of stationary energy storage systems, now requires large-scale fire testing to confirm that a system failure does not spread between units at specified spacing. To address these evolving requirements, Eos subjected modules to two severe abuse scenarios: direct flame impingement and overcharge. Even with active flame applied, the modules did not enter thermal runaway, did not sustain fire, and did not propagate to adjacent modules. The tests also showed no ignition of off-gas.

“The inherent fire safety of our zinc aqueous chemistry has been foundational to Eos from the beginning,” said Francis Richey, Eos Chief Technology Officer. “Independent testing using LSFT-equivalent methods turns that design into validated performance. Under direct flame and overcharge, the Z3 modules did not experience thermal runaway, sustain fire, or propagate failure. These are the outcomes that matter most to customers, regulators, first responders, and the communities that host our systems.”

The results reflect the inherent safety advantages of Eos’ water-based electrolyte and flame-retardant polymer architecture, which give long-duration storage a fundamentally different fire and thermal runaway risk profile than conventional chemistries. ESRG evaluated the modules under conditions more severe than those typically expected in real-world applications.

High-voltage, large-scale energy storage systems carry inherent electrical risks similar to those found in any type of power plant. Testing equivalent to large-scale fire testing is essential to understanding how these systems behave under failure conditions. In such destructive testing, the Eos battery module demonstrated a distinct safety profile, with no evidence of thermal runaway or propagation, outcomes that are highly relevant for effective risk mitigation, informed project siting, and ensuring long-term asset reliability.

“As energy storage becomes a larger part of our nation’s energy infrastructure, communities need confidence that safety is being prioritized,” said Matthew Brown, Chief of the Allegheny County Department of Emergency Services. “In November 2025, my department, along with several municipal departments, responded to an incident involving overcharged battery modules at Eos’ Turtle Creek facility. Even under that real-world stress, the system did not enter thermal runaway or escalate into a fire event. Eos’ recent independent fire test further validates what we witnessed firsthand in the field.”

“Energy storage is now critical infrastructure, and critical infrastructure has to be safe enough to sit close to where people live and work,” said Joe Mastrangelo, Eos Chief Executive Officer. “As data centers, utilities, and industrial users add storage inside dense urban environments, the market needs systems that scale without adding fire risk. ESRG’s independent testing validates that Eos technology is built to do exactly that, and it speaks directly to the siting, permitting, and insurance questions that shape where storage can go.”

Separately, Eos announced it has achieved ISO 14001 certification, the globally recognized standard for environmental management systems (EMS), following a comprehensive third-party evaluation. This certification confirms that Eos maintains robust environmental management practices that strengthen operational performance, risk management, and cost efficiency. The achievement reflects the maturity of Eos’ environmental practices across its operations and manufacturing facilities.

ESRG’s independent test results and the ISO 14001 certification provide third-party validation of Eos’ core technology and manufacturing operations, reinforcing the differentiated safety profile of Eos’ zinc-based chemistry as Eos scales toward 4 GWh of annual production capacity across its Turtle Creek and recently commercialized Thorn Hill facilities.

About Eos Energy Enterprises
Eos is accelerating the shift to American energy independence with positively ingenious solutions that transform how the world stores power. The Company’s BESS features the innovative Znyth™ technology, a proven chemistry with readily available non-precious earth components, designed to provide a safe, secure, stable, and scalable alternative to conventional technologies. The Company’s BESS is ideal for utility-scale, microgrid, commercial, and industrial long-duration energy storage applications (i.e., 4 to 16+ hours) and provides customers with significant operational flexibility to cost effectively address current and future increased grid demand and complexity. For more information about Eos (NASDAQ: EOSE), visit www.eose.com.

Forward Looking Statements
Except for the historical information contained herein, the matters set forth in this press release are forward-looking statements within the meaning of the “safe harbor” provisions of the Private Securities Litigation Reform Act of 1995. Forward-looking statements include, but are not limited to, statements that refer to outlook, projections, forecasts or other characterizations of future events or circumstances, including any underlying assumptions, including statements regarding the expected implications of the ESRG testing results, the anticipated benefits of the Company’s technology and environmental management systems, the Company’s targeted production capacity, and future customer adoption, project deployments, and commercial opportunities. The words “anticipate,” “believe,” “continue,” “could,” “estimate,” “expect,” “intends,” “may,” “might,” “plan,” “possible,” “potential,” “predict,” “project,” “should,” “would” and similar expressions may identify forward-looking statements, but the absence of these words does not mean that a statement is not forward-looking. Forward-looking statements are based on our management’s beliefs, as well as assumptions made by, and the information currently available to, them. Because such statements are based on expectations as to future financial and operating results and are not statements of fact, actual results may differ materially from those projected.

Factors which may cause actual results to differ materially from current expectations include, but are not limited to: changes adversely affecting the business in which we are engaged; our ability to forecast trends accurately; our ability to generate cash, service indebtedness and incur additional indebtedness; our ability to raise financing in the future; risks associated with the credit agreement with Cerberus, including risks of default, dilution of outstanding Common Stock, contractual lockup of shares; our customers’ ability to secure project financing; the timing, issuance and size of future project-level purchase orders and the conversion of framework agreements, backlog and pipeline into revenue; the ability of counterparties to perform under the Master Supply Agreement; risks associated with entering and operating in international markets, including regulatory, permitting, tax and supply chain considerations; the amount of final tax credits available to our customers or to Eos pursuant to the Inflation Reduction Act; the timing and availability of future funding under the Department of Energy Loan Facility; our ability to continue to develop efficient manufacturing processes to scale and to forecast related costs and efficiencies accurately; fluctuations in our revenue and operating results; competition from existing or new competitors; risks related to project development, construction and commissioning timelines; our ability to convert firm order backlog and pipeline to revenue; risks associated with security breaches in our information technology systems; risks related to legal proceedings or claims; risks associated with evolving energy policies in the United States and other countries and the potential costs of regulatory compliance; risks associated with changes to the U.S. trade environment; our ability to maintain the listing of our shares of common stock on NASDAQ; our ability to grow our business and manage growth profitably, maintain relationships with customers and suppliers and retain our management and key employees; risks related to the adverse changes in general economic conditions, including inflationary pressures and increased interest rates; risk from supply chain disruptions and other impacts of geopolitical conflict; changes in applicable laws or regulations; the possibility that Eos may be adversely affected by other economic, business, and/or competitive factors; other factors beyond our control; risks related to adverse changes in general economic conditions; and other risks and uncertainties.

The forward-looking statements contained in this press release are also subject to additional risks, uncertainties, and factors, including those more fully described in the Company’s most recent filings with the Securities and Exchange Commission, including the Company’s most recent Annual Report on Form 10-K and subsequent reports on Forms 10-Q and 8-K. Further information on potential risks that could affect actual results will be included in the subsequent periodic and current reports and other filings that the Company makes with the Securities and Exchange Commission from time to time. Moreover, the Company operates in a very competitive and rapidly changing environment, and new risks and uncertainties may emerge that could have an impact on the forward-looking statements contained in this press release.

Forward-looking statements speak only as of the date they are made. Readers are cautioned not to put undue reliance on forward-looking statements, and, except as required by law, the Company assumes no obligation and does not intend to update or revise these forward-looking statements, whether as a result of new information, future events, or otherwise.

PITTSBURGH, Pa., June 18, 2026 (GLOBE NEWSWIRE) — Eos Energy Enterprises, Inc. (NASDAQ: EOSE) (“Eos” or the “Company”), America’s leading innovator in designing, manufacturing, and providing zinc-based long-duration energy storage (LDES) systems sourced and manufactured in the United States, today announced the first purchase order under the 2 GWh capacity reservation agreement with Frontier Power USA Parent, LLC (FPUSA). The order supports FPUSA’s Redbird project, a 100 MW / 400 MWh battery energy storage system using Eos’ Z3™ technology.

Developed by Bimergen, and previously by Bridgelink, for the Electric Reliability Council of Texas (ERCOT) market, the Redbird project was previously approved under a Joint Development Agreement with Eos, with Eos’ Z3™ technology selected for deployment. As previously announced, FPUSA and its affiliates have acquired and will provide 100% of the equity for construction of the Redbird project. Bimergen retains a minority economic interest and will collaborate with FPUSA to bring the project into commercial operation.

“Redbird did not happen overnight. It came from years of working with Bimergen to move projects under active development toward execution,” said Nathan Kroeker, Chief Commercial Officer of Eos. “What FPUSA adds is the capital to turn opportunities into operating assets. That is what FPUSA was built to do, and the Redbird conversion is one of the first to prove it out.”

This order reinforces the strength and scalability of the FPUSA model: converting long-standing developer relationships into a high-quality, late-stage pipeline and deploying capital to bring projects that use Eos technology into operation.

“We developed Redbird to address growing demand for dispatchable storage in ERCOT and selected Eos because Z3™ is purpose-built for the multi-hour applications the market requires,” said Cole Johnson, Co-Chief Executive Officer of Bimergen Energy. “Combining proven technology with committed capital converts projects like Redbird into operating assets.”

Designed as a four-hour system, Redbird is expected to provide dispatchable storage capacity in ERCOT, supporting energy shifting, ancillary services, and overall grid reliability. The project meets rising demand for long-duration storage built for safety, reliability, and domestic supply chain strength, and is positioned to serve forecasted load growth and ERCOT market requirements.

“FPUSA was created to bridge the gap between project development and execution,” said Aaron Maczonis, Managing Director, Cerberus Capital Management. “FPUSA is building relationships with leading developers, assembling a portfolio of high-quality projects, and providing access to the capital needed to bring them online.”

As part of the acquisition and purchase order by FPUSA and its affiliates, the Redbird volume will be applied against the 2 GWh firm capacity reservation agreement between FPUSA and Eos. In addition, with this order, the Company has now fulfilled nearly 50% of the 1 GWh Bridgelink master supply agreement (MSA), while further advancing an additional development pipeline of 12 GWh across ERCOT, PJM, CAISO, and MISO.

About Eos Energy Enterprises

Eos is accelerating the shift to American energy independence with positively ingenious solutions that transform how the world stores power. The Company’s BESS features the innovative Znyth™ technology, a proven chemistry with readily available non-precious earth components, that is the pre-eminent safe, non-flammable, secure, stable, and scalable alternative to conventional technology. The Company’s BESS is ideal for utility-scale, microgrid, commercial, and industrial long-duration energy storage applications (i.e., 4 to 16+ hours) and provides customers with significant operational flexibility to cost effectively address current and future increased grid demand and complexity. For more information about Eos (NASDAQ: EOSE), visit eose.com.

About Frontier Power USA

FPUSA is a long-duration energy storage development and investment platform organized to accelerate the deployment of utility-scale battery infrastructure across the United States. FPUSA is the first in the long-duration energy storage industry designed to integrate development, committed manufacturing capacity, institutional capital, and insured performance under a single banner, which is expected to allow the conversion of development-stage pipelines into construction-ready assets at speed and scale. This compresses the time from project commitment to commercial operation. For more information visit frontierpowerusa.com.

About Bimergen Energy Corporation

Bimergen Energy Corporation (NYSE American: BESS) is a U.S.-based renewable energy developer, asset owner and independent power provider focused on utility-scale battery energy storage systems and solar projects. Bimergen develops and operates infrastructure designed to enhance grid stability and support the integration of renewable generation across key U.S. markets, maintaining a diversified pipeline and partnering with institutional capital providers to advance projects through construction and long-term operation. For more information visit Bimergen.com.

Contacts
Investors: ir@eose.com
Media: media@eose.com

Forward-Looking Statements and Important Information

Except for the historical information contained herein, the matters set forth in this press release are forward-looking statements within the meaning of the “safe harbor” provisions of the Private Securities Litigation Reform Act of 1995. Forward-looking statements include, but are not limited to, statements regarding the Redbird project and its expected capacity, configuration, and grid services; the conversion of the purchase order and the application of the Redbird volume against the 2 GWh firm capacity reservation agreement between Eos and FPUSA; the development, financing, construction, and commissioning of Redbird and other projects; Eos’ intent to acquire an equity interest in FPUSA and the timing and conditions of any such acquisition; the size and conversion of the Bridgelink, Bimergen, and broader FPUSA project pipeline into future purchase orders and backlog; the extent to which any purchase orders, capacity reservations, or project pipeline may ultimately result in executed contracts, construction activities, or revenue; and the anticipated benefits of the FPUSA platform and the Company’s relationships with developers. The words “anticipate,” “believe,” “continue,” “could,” “estimate,” “expect,” “intends,” “may,” “might,” “plan,” “possible,” “potential,” “predict,” “project,” “should,” “would” and similar expressions may identify forward-looking statements, but the absence of these words does not mean that a statement is not forward-looking. Forward-looking statements are based on our management’s beliefs, as well as assumptions made by, and the information currently available to, them. Because such statements are based on expectations as to future financial and operating results and are not statements of fact, actual results may differ materially from those projected.

Factors which may cause actual results to differ materially from current expectations include, but are not limited to: risks related to the development, financing, construction, and commissioning of the Redbird project and other projects, including timelines and the ability of counterparties to perform; the timing, issuance, and size of future project-level purchase orders and the conversion of framework agreements, capacity reservations, backlog, and pipeline into revenue; risks related to FPUSA, including its ability to source, acquire, finance, and execute projects, and risks related to Eos’ intended equity interest in FPUSA and any related-party considerations; risks associated with the credit agreement with Cerberus, including risks of default, dilution of outstanding Common Stock, and contractual lockup of shares; our customers’ and project counterparties’ ability to secure project financing; changes adversely affecting the business in which we are engaged; our ability to generate cash, service indebtedness, and raise financing in the future; our ability to continue to develop efficient manufacturing processes to scale and to forecast related costs and efficiencies accurately; the amount of final tax credits available pursuant to the Inflation Reduction Act; the timing and availability of future funding under the Department of Energy Loan Facility; competition from existing or new competitors; risks related to legal proceedings or claims; risks associated with evolving energy policies in the United States and the potential costs of regulatory compliance; changes in applicable laws or regulations; our ability to maintain the listing of our shares of common stock on NASDAQ; our ability to grow our business and manage growth profitably and to retain management and key employees; risks related to adverse changes in general economic conditions, including inflationary pressures and increased interest rates; risk from supply chain disruptions and other impacts of geopolitical conflict; and other risks and uncertainties.

The forward-looking statements contained in this press release are also subject to additional risks, uncertainties, and factors, including those more fully described in the Company’s most recent filings with the Securities and Exchange Commission, including the Company’s most recent Annual Report on Form 10-K and subsequent reports on Forms 10-Q and 8-K. Further information on potential risks that could affect actual results will be included in the subsequent periodic and current reports and other filings that the Company makes with the Securities and Exchange Commission from time to time. Moreover, the Company operates in a very competitive and rapidly changing environment, and new risks and uncertainties may emerge that could have an impact on the forward-looking statements contained in this press release.

Forward-looking statements speak only as of the date they are made. Readers are cautioned not to put undue reliance on forward-looking statements, and, except as required by law, the Company assumes no obligation and does not intend to update or revise these forward-looking statements, whether as a result of new information, future events, or otherwise.

This press release includes information about a proposed series of transactions, including the formation of a joint venture between us and CCM Frontier JV Holdco, LLC, an affiliate of Cerberus Capital Management (“Cerberus”), certain commercial arrangements to be entered into between us and FPUSA, and other related transactions (collectively, the “Proposed Transactions”). We and Cerberus have entered into a binding term sheet with respect to the Proposed Transactions. However, the completion of the Proposed Transactions remains subject to a number of conditions and uncertainties, including the receipt of required third party-approvals, including the approval of the Department of Energy, the negotiations and entry into definitive agreements for the Proposed Transactions and the negotiation of certain terms of the Proposed Transactions. While we currently intend to take the actions within our control to complete the Proposed Transactions on the contemplated terms and timeline, there can be no assurances that the Proposed Transactions will be completed on the contemplated terms or timeline or that the Proposed Transactions will be completed at all.