York Space Systems’ Chief Executive Officer and Chief Financial Officer are named as individual defendants in a pending securities class action, which charges that the officers who signed the Company’s IPO Registration Statement did not disclose that mission-critical satellite software was allegedly not fully functional before launch.

NEW YORK, Sept. 10, 2026 /PRNewswire/ — Chief Executive Officer Dirk Wallinger and Chief Financial Officer Kevin Messerle are named as individual defendants and alleged control persons in a pending securities class action against York Space Systems Inc. (NYSE: YSS), brought on behalf of purchasers of the Company’s securities between January 29, 2026 and May 11, 2026. Find out if you may qualify to recover losses or contact Joseph E. Levi, Esq. at jlevi@SueWallSt.com | (888) SueWallSt.

Shares sold in the January 2026 offering at $34.00 were trading as low as $9.33 by the time the action was brought, a decline of $24.67 per share, or more than 70%. To be considered for lead plaintiff, investors must file by October 30, 2026.

The Named Individual Defendants

Wallinger served as CEO and Messerle as CFO at all relevant times, and each signed or authorized the signing of the Company’s Registration Statement, the pleading asserts. Both are alleged to have held the power and authority to control the contents of York’s reports to the SEC, its press releases, and its presentations to analysts and institutional investors.

Alleged Control Person Liability

• Each officer allegedly received copies of the reports and releases claimed to be misleading before or shortly after issuance, and had the ability and opportunity to prevent or correct them.
• The complaint charges that both had access to material non-public information indicating that onboard mission and payload software was not fully functional before satellites were launched.
• Offering materials attributed to the Company touted “proprietary satellite software” and a modular, scalable architecture that former employees quoted in the action described as made to order.
• The pleading asserts that investors were not told this alleged pattern created risk to York’s contracts with the customer responsible for substantially all of the Company’s revenue.
• Section 20(a) of the Exchange Act permits recovery from those alleged to have controlled a primary violator, and Section 15 of the Securities Act supplies a parallel path for the offering claims.

Sarbanes-Oxley Certification Obligations

Officers who certify periodic reports under Sections 302 and 906 personally attest that those filings contain no untrue statement of material fact. As averred in the action, it is that personal attestation that places individual accountability at the center of this case rather than corporate liability alone.

“Corporate officers have a duty to ensure their companies’ public statements are accurate and complete. Here, the action alleges that the executives who signed York’s Registration Statement did not disclose that mission-critical software was unfinished when satellites launched. Shareholders are entitled to have that question tested.” — Joseph E. Levi, Esq.

Submit your information here or call (888) SueWallSt.

WHY SUEWALLST: SueWallSt is powered by Levi & Korsinsky LLP. Levi & Korsinsky LLP has established itself as a nationally-recognized securities litigation firm that has secured hundreds of millions of dollars for aggrieved shareholders and built a track record of winning high-stakes cases. The firm has extensive expertise representing investors in complex securities litigation and a team of over 70 employees to serve our clients. For seven years in a row, Levi & Korsinsky has ranked in ISS Securities Class Action Services’ Top 50 Report as one of the top securities litigation firms in the United States.

Frequently Asked Questions About the YSS Lawsuit

Q: Who are the defendants named in the YSS lawsuit? A: The complaint names York Space Systems Inc. and individual defendants including senior executives who signed SEC filings, made public statements, or certified financial disclosures under Sarbanes-Oxley.

Q: What specific misstatements does the YSS lawsuit allege? A: The complaint alleges York Space Systems made materially false or misleading statements regarding the functionality and readiness of its satellite software and the maturity of its purportedly modular spacecraft platform during the Class Period. When a research report alleged that satellites had been launched with incomplete mission-critical software and that funding for the Company’s principal program had been halted, the stock price declined sharply.

Q: What court was the YSS class action filed in? A: The case was filed in the United States District Court for the District of Colorado, governed by the Private Securities Litigation Reform Act of 1995.

Q: What is a lead plaintiff and why does it matter? A: A lead plaintiff is the investor appointed by the court to represent the entire class. Lead plaintiffs are typically investors with the largest documented losses. Being appointed does not increase individual recovery but gives direct oversight of how the case is run.

Q: What do YSS investors need to do right now? A: Investors may gather brokerage records showing purchase dates, share quantities, and prices paid. Submit your information for a no-cost, no-obligation evaluation of your potential recovery. No immediate action is required to remain eligible as an absent class member.

Q: What if I already sold my YSS shares — can I still recover losses? A: Yes. Eligibility is based on when you purchased, not whether you still hold the shares. Investors who bought during the Class Period and sold at a loss may still be eligible to participate.

Q: Do I need to go to court or give testimony? A: No. The overwhelming majority of class members never appear in court or give depositions. If there is a settlement or recovery, eligible class members generally submit a claim form to seek their portion.

Q: What does it cost me to participate? A: There is no upfront cost to submit your information and review whether you may be eligible to recover. Should you choose to participate in the securities class action, they are generally handled on a contingency basis, with any attorneys’ fees and expenses subject to court approval.

CONTACT:

Levi & Korsinsky, LLP

Joseph E. Levi, Esq.

33 Whitehall Street, 27th Floor

New York, NY 10004

jlevi@SueWallSt.com

Tel: (888) SueWallSt

Fax: (212) 363-7171

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