Hyliion Holdings Corp. Investigation - HYLN

Company: Hyliion Holdings Corp.

Ticker: (NYSE) HYLN

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Certification of Plaintiff Pursuant to Federal Securities Laws

I, duly certify and say, as to the claims asserted under the federal securities laws, that:

1. I have reviewed a complaint filed in the action.

2. I did not purchase the security that is the subject of this action at the direction of plaintiff's counsel or in order to participate in this action.

3. I am willing to serve as a representative party on behalf of the class, including providing testimony at deposition and trial, if necessary.

4. My transaction(s) in Hyliion Holdings Corp. which are the subject of this litigation during the class period set forth in the complaint are set forth in the chart attached hereto.

5. Within the last 3 years,

I have not sought to serve nor have I served as a class representative in any federal securities fraud case.
I have sought to serve as a class representative in

6. I will not accept any payment for serving as a representative party on behalf of the class beyond the Plaintiff's pro rata share of any recovery, except as ordered or approved by the court, including any award for reasonable costs and expenses (including lost wages) directly relating to the representation of the class.

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Yes. I certify under penalty of perjury that the foregoing is true and correct. Executed this
No. I certify under penalty of perjury under the laws of the United States of America that the foregoing is true and correct. Executed this

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Signed pursuant to California Civil Code Section 1633.1, et seq. - and the Uniform Electronic Transactions Act as adopted by the various states and territories of the United States.

By your signature above, you confirm that have retained Levi & Korsinsky, LLP to represent you and the shareholder class as a lead plaintiff in the pending class action against Hyliion Holdings Corp. This representation will be on a contingency basis, meaning that Levi & Korsinsky will advance all expenses in the litigation and will only seek compensation and/or reimbursement of expenses if the firm obtains a recovery. Regardless of the result, we will never ask you to directly pay for any attorneys’ fees, expenses, or costs. Should we obtain a favorable result, we may ask the court to award us compensation and reimbursement of expenses to be paid by the defendants or as a portion of any class recovery. In exchange for our representation, you agree to cooperate as our client by providing, for example, relevant documents and deposition testimony, if necessary. During the course of this litigation, we may employ and/or work with other law firms, experts, and third-parties to successfully prosecute this action. If you are not appointed as the lead plaintiff or Levi & Korsinsky is not appointed as lead counsel, we will notify you of such decision at which time this representation will end unless otherwise extended by you and the firm. We look forward to working with you towards a successful resolution of this action.

I have reviewed the complaint linked in paragraph 1

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Investigation Details

Hyliion Holdings lost 13-17% of its share price in a single trading session after a short-seller report challenged the credibility of a $133 million deal that represented roughly one-third of the company’s disclosed pipeline.

Hyliion’s Q1 2026 10-Q, filed May 12, 2026, disclosed that a single unidentified customer accounted for 100% of quarterly revenue. The filing did not name the customer or address concentration risk. During the same period, management publicly described a pipeline of “nearly 500 units under non-binding letters of intent” across multiple customers on its Q4 2025 earnings call on February 25, 2026.

The company’s 10-K for fiscal year 2025, filed February 25, 2026, contained no reference to the $133 million AI-data-center LOI with VFG Holdings. CEO Thomas Healy signed a Sarbanes-Oxley Section 302 certification on the same filing, attesting that it did not omit any material fact necessary to make the statements made not misleading.