ROSEN, A LONGSTANDING FIRM, Encourages Hyliion Holdings Corp. Investors to Secure Counsel Before Important Deadline in Securities Class Action - HYLN

Rosen Law Firm, a global investor rights law firm, reminds purchasers of securities of Hyliion Holdings Corp. (NYSE American: HYLN) between May 12, 2026 and June 23, 2026, both dates inclusive (the "Class Period"), of the important October 27, 2026 lead plaintiff deadline in the securities class action first filed by the Firm.

If you purchased Hyliion securities during the Class Period you may be entitled to compensation without payment of any out of pocket fees or costs through a contingency fee arrangement.

To join the Hyliion class action, go to https://rosenlegal.com/cases/hyliion-holdings-corp/join or call Phillip Kim, Esq. toll-free at 866-767-3653 or email [email protected] for information on the class action.

A class action lawsuit has already been filed. If you wish to serve as lead plaintiff, you must move the Court no later than October 27, 2026. A lead plaintiff is a representative party acting on behalf of other class members in directing the litigation.

We encourage investors to select qualified counsel with a track record of success in leadership roles. Often, firms issuing notices do not have comparable experience, resources, or any meaningful peer recognition. Many of these firms do not actually handle securities class actions, but are merely middlemen that refer clients or partner with law firms that actually litigate the cases. Be wise in selecting counsel. The Rosen Law Firm represents investors throughout the globe, concentrating its practice in securities class actions and shareholder derivative litigation. Rosen Law Firm achieved the largest ever securities class action settlement against a Chinese Company. Rosen Law Firm was Ranked No. 1 by ISS Securities Class Action Services for number of securities class action settlements in 2017. The firm has been ranked in the top 4 each year since 2013 and has recovered billions of dollars for investors. In 2019 alone the firm secured over $438 million for investors. In 2020, founding partner Laurence Rosen was named by law360 as a Titan of Plaintiffs' Bar. Many of the firm's attorneys have been recognized by Lawdragon and Super Lawyers.

According to the lawsuit, defendants made false and/or misleading statements and/or failed to disclose that: (1) in order to cause rapid price appreciation in Hyliion stock, defendants announced a deal with an entity that was very recently formed and does not appear to have any actual business operations; (2) Thomas Healy, Hyliion's Chief Executive Officer ("CEO"), and Jon Panzer Hyliion's Chief Financial Officer ("CFO"), timed the announcement and foregoing price appreciation to insider trade; and (3) as a result, defendants' statements about Hyliion's business, operations, and prospects, were materially false and misleading and/or lacked a reasonable basis at all relevant times. When the true details entered the market, the lawsuit claims that investors suffered damages.

To join the Hyliion class action, go to https://rosenlegal.com/cases/hyliion-holdings-corp/join or call Phillip Kim, Esq. toll-free at 866-767-3653 or email [email protected] for information on the class action.

No Class Has Been Certified. Until a class is certified, you are not represented by counsel unless you retain one. You may select counsel of your choice. You may also remain an absent class member and do nothing at this point. An investor's ability to share in any potential future recovery is not dependent upon serving as lead plaintiff.