Hyliion Holdings Corp. filings document formal disclosures for a developer of modular power plant technology centered on the KARNO™ generator platform. Recent Form 8-K reports furnish quarterly and annual results announcements, including management updates on KARNO development, testing, customer applications, military programs, and related business milestones.
The company’s proxy materials cover board matters, shareholder voting items, executive compensation, equity awards, pay-versus-performance tables, and governance disclosures. Together, these filings provide the regulatory record for Hyliion’s operating results, public-company governance, compensation structure, and capital-market communications as it develops distributed power-generation technology.
Joshua T. Mook, Chief Technology Officer of Hyliion Holdings Corp. (HYLN), reported a non-derivative disposition of common stock on 08/27/2025. The filing shows 1,361 shares were disposed of at $1.69 per share, leaving the reporting person with 519,688 shares beneficially owned after the transaction. The explanatory note states the shares were withheld to satisfy a tax liability related to the vesting and distribution of restricted stock units. The Form 4 is signed by Joshua T. Mook on 08/29/2025 and identifies the transaction as routine withholding for taxes rather than an open-market sale.
Insider sale by Hyliion Holdings Corp. officer Jose Miguel Oxholm, listed as Chief Legal & Compliance Officer, reported a sale of 12,573 shares of Hyliion common stock on 08/25/2025 at a reported price of $1.77 per share. After the transaction, Oxholm beneficially owned 800,939 shares, reported as direct ownership.
The filing explains the shares were sold to pay a tax liability arising from the vesting and distribution of restricted stock units. The Form 4 is signed by Oxholm and filed as an individual report by one reporting person.
Joshua T. Mook, Chief Technology Officer of Hyliion Holdings Corp. (HYLN), reported a sale of company common stock on 08/25/2025. The filing discloses disposition of 8,430 shares at a reported price of $1.77 per share to satisfy a tax liability arising from the vesting and distribution of restricted stock units. After the sale, Mr. Mook beneficially owns 521,049 shares, held directly. The Form 4 is filed by one reporting person and is signed by Mr. Mook.
Insider sale to cover taxes: Hyliion Holdings Corp. (HYLN) reported that Cheri Lantz, Chief Strategy Officer, disposed of 10,195 shares of common stock on 08/25/2025 at $1.77 per share. The filing states the sale was made to pay a tax liability arising from the vesting and distribution of restricted stock units. After the transaction, Lantz beneficially owned 782,802 shares, reported as direct ownership. The Form 4 is a routine disclosure showing share reduction tied to employee compensation tax withholding rather than an open-market investment decision.
Thomas J. Healy, CEO and director of Hyliion Holdings Corp. (HYLN), reported a sale of common stock on 08/25/2025. The Form 4 shows he disposed of 61,603 shares at $1.77 per share to pay a tax liability tied to the vesting and distribution of restricted stock units. After the transaction, Healy beneficially owned 35,335,284 shares. The filing is a routine section 16 disclosure recording an insider sale to satisfy tax obligations from equity compensation.
Richard J. Freeland, a director of Hyliion Holdings Corp. (HYLN), purchased 65,000 shares of the issuer's common stock on 08/21/2025 at a price of $1.57 per share. Following this reported purchase, Mr. Freeland beneficially owns 222,798 shares. The Form 4 indicates the filing was made by a single reporting person and is signed by Mr. Freeland on 08/21/2025. No derivative transactions or other securities classes are reported on this form.
Greg Standley, Chief Accounting Officer of Hyliion Holdings Corp. (HYLN) reported a transaction on 08/12/2025 where 2,781 shares of common stock were disposed of at $1.69 per share. The filing states these shares were withheld to satisfy a tax liability arising from the vesting and distribution of restricted stock units. After the withholding, Mr. Standley beneficially owned 232,052 shares, held directly. The Form 4 was signed on 08/14/2025 and identifies the sale as a routine tax-withholding action tied to equity compensation rather than an open-market trade.
Govindaraj Ramasamy, Chief Commercial Officer of Hyliion Holdings Corp. (HYLN), reported routine dispositions of company common stock tied to restricted stock unit (RSU) vesting. On 08/12/2025 he disposed of 4,931 shares at $1.69 per share and on 08/13/2025 he disposed of 4,110 shares at $1.66 per share. The filing shows shares were withheld to satisfy a tax liability arising from the vesting and distribution of RSUs, not open-market selling for other purposes.
Following the 08/12 transaction his beneficial ownership was 568,071 shares and after the 08/13 transaction it was 563,961 shares. The Form 4 was signed on 08/14/2025 and is filed as a single-person report.
Jon Panzer, Chief Financial Officer of Hyliion Holdings Corp. (HYLN), reported two small share dispositions tied to restricted stock unit vesting. The Form 4 shows that on 08/12/2025 he disposed of 6,271 shares at $1.69 each and on 08/13/2025 he disposed of 5,226 shares at $1.66 each. Following those transactions his beneficial ownership declined from 922,493 to 910,996 shares, reflecting shares withheld to cover taxes associated with the vesting and distribution of restricted stock units. The filing is signed by Mr. Panzer on 08/14/2025.
Hyliion Holdings Corp. reported modest R&D services revenue of $1.5 million for the quarter and $2.0 million for the six months ended June 30, 2025, while recording a net loss of $13.4 million for the quarter and $30.7 million year-to-date. Research and development expense rose to $10.1 million in the quarter and $22.4 million for six months as the company advanced development and production activities for its KARNO Power Module.
The balance sheet shows $15.6 million in cash and cash equivalents and held-to-maturity investments with a fair value of approximately $170.0 million, which management states is sufficient to fund operations for the next twelve months. The company continues the approved wind-down of its powertrain business while focusing on KARNO commercialization, noting delivery of two early-adopter units and ongoing R&D under a Department of the Navy agreement originally awarded for up to $16.0 million with $15.2 million of remaining potential revenue as of June 30, 2025.