A securities class action alleges York Space Systems launched Tranche 1 satellites before mission-critical software was finished, with the disclosure record unraveling across three separate events between March and May 2026 as YSS fell more than 70% from its $34.00 IPO price.

NEW YORK, Sept. 17, 2026 /PRNewswire/ — SueWallSt encourages investors who suffered losses in York Space Systems Inc. (NYSE: YSS) to contact the firm regarding a pending securities class action brought on behalf of purchasers of York securities between January 29, 2026 and May 11, 2026, and those who acquired shares in or traceable to the Company’s January 2026 IPO. Find out if you might be eligible to recover losses. You may also contact Joseph E. Levi, Esq. at jlevi@SueWallSt.com or (888) SueWallSt.

York priced its IPO at $34.00 per share, raising approximately $583.4 million. By the time the action was brought, YSS traded as low as $9.33 per share, a decline of $24.67 per share, or more than 70%. Those wishing to serve as lead plaintiff must act by October 30, 2026.

Chronology of Material Events

The lawsuit chronicles a sequence in which the warning signs multiplied rather than arriving all at once. Each successive event narrowed the distance between what the Company had told the market about its satellite software and modular platform and what the action claims was actually happening behind the launch schedule.

Timeline of Alleged Disclosure Failures

• January 29, 2026: YSS common stock begins trading under a registration statement that, as detailed in the action, described “proprietary satellite software” and a “modular, backward-compatible design approach.”
• March 19, 2026: Fourth quarter and full year 2025 results report revenue of $386 million, an increase of $133 million or 52%, and highlight delivery of 21 Tranche 1 Transport Layer satellites to orbit.
• March 26, 2026: Breaking Defense reports the SDA is roughly three months behind schedule on laser mesh network demonstrations and is taking a “strategic pause” on further Tranche 1 launches.
• April 2026: The Space Force Spring 2026 budget restructures the Transport Layer program and halts Tranche 3 payments, redirecting them to a newly unveiled Space Data Network.
• May 11, 2026: A published research report cites former employees who allege satellites were sent to orbit before onboard software was fit to accomplish its basic mission. Shares fell approximately $7 during intraday trading on unusually heavy volume.

May 11, 2026: The Escalation Investors Could Not Ignore

The complaint recounts that 96% of fiscal 2025 revenue came from SDA-contracted work. The action claims earlier statements emphasizing mission assurance and delivery velocity were misleading because mission and payload software allegedly was not fully functional prior to launch, with debugging occurring in orbit.

“Timely disclosure of material developments is fundamental to fair and efficient markets. This case asks whether York investors learned the state of the Company’s onboard mission software only after a budget restructuring and a research report made the issue impossible to overlook.” — Joseph E. Levi, Esq.

Click here to submit your information and learn more about the case 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: When did York Space Systems Inc. allegedly mislead investors? A: The Class Period runs from January 29, 2026 to May 11, 2026. The complaint alleges that corrective disclosures revealed information that caused a significant stock decline.

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: 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, along with the underwriters of the January 2026 IPO.

Q: What documents do I need to submit my information? A: Brokerage statements or trade confirmations showing purchase dates, share quantities, prices paid, and any subsequent sale dates and prices.

Q: What happens after I contact Levi & Korsinsky? A: An attorney will review your trading history at no cost and provide an initial assessment of your potential eligibility.

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: How long will the lawsuit take to resolve? A: Securities class actions typically take two to four years from initial filing to resolution. Timing depends on the court schedule, case developments, and whether the matter is dismissed, settled, or litigated further.

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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SOURCE SueWallSt.com