The law firm of Kirby McInerney LLP announces that a class action lawsuit has been filed on behalf of investors who acquired York Space Systems Inc. (“York” or the “Company”) (NYSE: YSS): (a) common stock pursuant and/or traceable to the registration statement and prospectus (collectively, the “Registration Statement”) issued in connection with the Company’s January 29, 2026 initial public offering (“IPO” or the “Offering”); and/or (b) securities during the period of January 29, 2026 through May 11, 2026, inclusive (“the Class Period”). Investors are encouraged to contact Lauren Molinaro of Kirby McInerney LLP by email at investigations@kmllp.com, or fill out the contact form below to discuss your rights or interests in the securities fraud class action lawsuit at no cost.

If you suffered a loss on your York investments, you have until October 30, 2026 to request lead plaintiff appointment. Courts do not consider lead plaintiff applications submitted after this deadline. If you choose to take no action, you may remain an absent class member. For more information about the lawsuit:

[CONTACT THE FIRM IF YOU SUFFERED A LOSS]

What Is This Lawsuit About? The lawsuit alleges that York made materially false and/or misleading statements and failed to disclose to investors that: (i) York’s onboard mission and payload software was not fully functional before satellites were launched; and (ii) this ongoing trend presented a risk to the Company’s contracts with the Pentagon’s Space Development Agency (“SDA”).

York launched its IPO on January 29, 2026, selling 18.5 million shares priced at $34.00 per share.

On May 11, 2026, Wolfpack Research published a report entitled “YSS: Lost in Space — The Pentagon Just Killed 96% of York’s Revenue.” The report states, “While the Pentagon has not specified the reasons for their move to halt Tranche 3 funding and destroy the SDA, we suspect it may have been due to York’s failure to live up to their own hype.” Citing former software engineers, the report asserts that York “sent satellites into space without even knowing if the software was fit to accomplish its basic mission” and that “York’s satellites simply did not function as expected because the company did not finish developing the software for these satellites before launching them.” On this news, York’s stock price fell $3.91, or 10.9%, to close at $31.97 per share on May 12, 2026.

By the commencement of this action, the Company’s stock traded as low as $9.33 per share, a more than 70% decline from the $34.00 per share IPO price.

[LEARN MORE ABOUT THE LAWSUIT]

The Lead Plaintiff Appointment Process. The federal securities laws permit any investor who acquired eligible securities during the class period to seek appointment as lead plaintiff in a class action lawsuit. Learn more about the lead plaintiff process and eligibility requirements here. Courts typically appoint the investor(s) with the largest financial loss in the case and the ability to represent the class rather than investors with simply the largest investment portfolio. Courts regularly appoint individual investors, whether acting alone or as a group, as lead plaintiffs. The rights of any investor who bought shares during the class period are generally already protected. However, lead plaintiffs have the power to influence case strategy and have a say in settlement decisions, as well as decisions concerning allocation of settlement funds among class members.

[LEARN MORE ABOUT THE LEAD PLAINTIFF PROCESS]

What Should I Do? If you purchased or otherwise acquired York securities, have information, or would like to learn more about this investigation, please contact Lauren Molinaro of Kirby McInerney LLP by email at investigations@kmllp.com, or fill out the contact form below, to discuss your rights or interests with respect to these matters at no cost.

Kirby McInerney LLP is a New York-based plaintiffs’ law firm concentrating in securities, antitrust, whistleblower, and consumer litigation. The firm’s efforts on behalf of shareholders in securities litigation have resulted in recoveries totaling billions of dollars. Additional information about the firm can be found at Kirby McInerney LLP’s website.

This press release may be considered Attorney Advertising in some jurisdictions under the applicable law and ethical rules.

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