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Shimmick Announces Intention to Appeal Recent Decision Related to Chickamauga Lock Project

Shimmick Announces Intention to Appeal Recent Decision Related to Chickamauga Lock Project

Shimmick Corporation, a national leader in complex infrastructure solutions, today announced the Company will commence an appeal of a recent action from the U.S. Army Corps of Engineers (USACE) regarding its involvement in the Chickamauga Lock replacement project in Chattanooga, Tennessee.

Shimmick was engaged in 2017 to construct the 600lock chamber of the Chickamauga Lock Replacement Project, including drilled shafts, mass concrete and installation of miter gate and associated systems.  It has collaborated with the USACE, numerous local sub-contractors – many of which employ unionized workforces – and other partners of the project over recent years to complete the Project safely and in accordance with the contract requirements, working over 5 million manhours, reaching a workforce of over 425 workers on site.

We are grateful for our hardworking employees, subcontractors and other local partners who have helped progress this important project despite the unique challenges faced during our work on it,said Ural Yal, Shimmick’s Chief Executive Officer.Shimmick has a long history of serving as a strong partner to the USACE and takes pride in our work together for nearly a century.

The USACE issued a notice of termination of Shimmick’s right to proceed under the 2017 contract on May 8, 2026. Shimmick disputes the USACE’s termination. Under the terms of the contract, the contractor has a right to appeal certain decisions of the USACE’s contracting officer within 90 days of notice. Shimmick plans on exercising that right to challenge the termination and obtain compensation for the work-related costs the Company is entitled to.

While we dispute the termination, we respect and appreciate the USACE’s commitment to completing this project and believe it is critically important for there to be a true and accurate understanding of the challenges associated with this project to date, including the impact of certain change order requests on our work. We look forward to sharing this information through the appropriate channels.Yal said.

Change orders are common in large, complex construction projects such as the Chickamauga Lock replacement. Shimmick has a long history of working for USACE and continues to support the USACE on two other active projects in Texas and California, respectively.

About Shimmick

Shimmick Corporation (NASDAQ: SHIM) is an industry leader in delivering turnkey infrastructure solutions that strengthen critical markets across water, energy, climate resilience, and sustainable transportation. We integrate technical excellence with collaborative project delivery methods to provide innovative, technology-driven infrastructure solutions that accelerate economic growth and empower communities nationwide. With a track record spanning over a century, Shimmick, headquartered in California, unites a deep engineering heritage with an entrepreneurial spirit to tackle today’s most complex infrastructure challenges. For more information, visit www.shimmick.com.

Media Contact: Lee Ann Ballew LeeAnn.Ballew@shimmick.com

Forward-Looking Statements

This release contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended (theExchange Act). These forward-looking statements are often characterized by the use of words such asmay,” “should,” “expects,” “plans,” “anticipates,” “could,” “intends,” “targets,” “projects,” “contemplates,” “believes,” “estimates,” “predicts,” “potentialorcontinueor the negative of these terms or other similar words. Forward-looking statements are only predictions based on our current expectations and our projections about future events, and we undertake no obligation to update any forward-looking statement to reflect events or circumstances, including, but not limited to, unanticipated events, after the date on which such statement is made, unless otherwise required by law. Forward-looking statements contained in this release include, but are not limited to, statements about: our intent to appeal the USACE’s recent notice of termination with related to the Chickamauga Lock project, our ability to obtain any compensation in connection therewith, and our ability to continue to cooperate with the USACE on other active projects. These statements involve risks and uncertainties, and actual results may differ materially from any future results expressed or implied by the forward-looking statements. Forward-looking statements are only predictions based on our current expectations and our projections about future events, and we undertake no obligation to update any forward-looking statement to reflect events or circumstances, including, but not limited to, unanticipated events, after the date on which such statement is made, unless otherwise required by law.

We wish to caution readers that, although we believe any forward-looking statements are based on reasonable assumptions, certain important factors may have affected and could in the future affect our actual financial results and could cause our actual financial results for subsequent periods to differ materially from those expressed in any forward-looking statement made by or on our behalf, including, but not limited to, the following: our ability to accurately estimate risks, requirements or costs when we bid on or negotiate a contract; the impact of our fixed-price contracts; qualifying as an eligible bidder for contracts; the availability of qualified personnel, joint venture partners and subcontractors; inability to attract and retain qualified managers and skilled employees and the impact of loss of key management; higher costs to lease, acquire and maintain equipment necessary for our operations or a decline in the market value of owned equipment; subcontractors failing to satisfy their obligations to us or other parties or any inability to maintain subcontractor relationships; marketplace competition; our inability to obtain bonding; our limited operating history as an independent company following our separation from AECOM, our prior owner, our relationship and transactions with our prior owner; our prior owner defaulting on its contractual obligations to us or under agreements in which we are beneficiary; our limited number of customers; any inability to successfully expand our business into new markets or geographies; dependence on subcontractors and suppliers of materials; any inability to secure sufficient aggregates; an inability to complete a merger or acquisition or to integrate an acquired company’s business; adjustments in our contract backlog; accounting for our revenue and costs involves significant estimates, as does our use of the input method of revenue recognition based on costs incurred relative to total expected costs; material impairments; any failure to comply with covenants under any current indebtedness, and future indebtedness we may incur; the adequacy of sources of liquidity; the outcome of any legal or regulatory proceedings to which we are, or may become, a party, including our appeal of the USACE’s notice of termination related to the Chickamauga Lock project; the effectiveness of our disclosure controls and procedures; cybersecurity attacks against, disruptions, failures or security breaches of, our information technology systems; seasonality of our business; commodity products price fluctuations, inflation (and actions taken by monetary authorities in response to inflation) and/or elevated interest rates; climate change; deterioration of the U.S. economy; changes in state and federal laws, regulations or policies under the current presidential administration, including changes in trade policies and regulations, including increases or changes in duties, current and potentially new tariffs or quotas and other similar measures, as well as the impact of retaliatory tariffs and other actions, changes to tax legislation, including the passage of the One Big Beautiful Bill Act, potential changes to the amounts provided for under the Infrastructure Investment and Jobs Act, changes to immigration laws, as well as other legislation and executive orders or decreases or delays in or uncertainties related to governmental spending, and geopolitical risks, including those related to the war between Russia and Ukraine and the conflict and potential regime change in Iran, as well as other hostilities in the Middle East, and related disruptions to global energy markets; and other risks detailed in our filings with the Securities and Exchange Commission, including the “Risk Factors” section in our Annual Report on Form 10-K for the fiscal year ended January 2, 2026 and those described from time to time in our future reports with the SEC.