<div id="readability-page-1"><div><p><span>Mook Joshua T Officer of Hyliion Holdings Corp [HYLN] filed a Form 4 on December 1, 2025 with the Securities and Exchange Commission disclosing the following changes in ownership:</span></p><div><table><tbody><tr><td><span>Date</span></td><td><span>11/27/25</span></td></tr><tr><td><span>Transaction</span></td><td><span>Surrender(1)</span></td></tr><tr><td><span>Shares</span></td><td><span>1,361</span></td></tr><tr><td><span>Price</span></td><td><span>$1.85</span></td></tr><tr><td><span>Value</span></td><td><span>$2,518</span></td></tr></tbody></table></div><p><span>Ending Holdings: 1,046,752 - Direct</span></p><ul><li><span>(1)</span></li><li><span>Surrender of shares back to company to pay option exercise cost and/or resulting tax liability.</span></li></ul><p><span>For a free trial, or to learn more about our insider trading analysis and data services, please visit http://www.washingtonservice.com or contact us at (301) 913-5100 or send an email to info@washingtonservice.com.</span></p><p><span>Founded in 1970, The Washington Service provides securities professionals with financial, economic and public policy research and data.</span></p><span> </span></div></div>

HYLN

<p>Officer Mook Joshua T of Hyliion Holdings Corp surrendered 1,361 shares back to the company to cover option exercise costs and tax liabilities. The transaction was filed with the SEC on December 1, 2025, with shares valued at $2,518. Mook's ending holdings are 1,046,752 shares directly.</p>

Officer Mook Surrenders 1,361 Of Hyliion Holdings Corp [HYLN]