Welcome to our dedicated page for Hyliion Holdings Corporation SEC filings (Ticker: HYLN), a comprehensive resource for investors and traders seeking official regulatory documents including 10-K annual reports, 10-Q quarterly earnings, 8-K material events, and insider trading forms.
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.
Hyliion Holdings Corp. reported that an affiliated holder plans to sell 220,000 shares of its common stock through UBS Financial Services Inc., with an aggregate market value of $432,000, on or about 12/12/2025 on the NYSE. The filing notes that Hyliion common stock outstanding was 175,400,000 shares.
The shares to be sold were acquired on 12/12/2025 in an employee benefit transaction from Hyliion Holdings Corp., with cash listed as the form of payment. The disclosure also records that Thomas Healy sold 159,776 common shares on 11/17/2025 for gross proceeds of $265,300 during the prior three months.
A shareholder of Hyliion Holdings Corp has filed a notice of proposed sale under Rule 144 covering 30,000 shares of common stock. The shares are to be sold through UBS Financial Services Inc. on the NYSE, with an indicated aggregate market value of $58,500. The filing notes that the issuer has 175,400,000 shares of this class outstanding. The seller acquired the 30,000 shares on 12/12/2025 in an employee benefit transaction from Hyliion Holdings Corp and paid for them in cash on the same date.
Hyliion Holdings Corp reported a planned insider sale under Rule 144 for 32,000 common shares. The shares are to be sold through UBS Financial Services Inc. on the NYSE, with an aggregate market value listed at $62,400. The filing notes 175,400,000 shares of the same class outstanding, providing context for the size of the transaction.
The seller acquired the 32,000 common shares from Hyliion Holdings Corp on 12/12/2025 as an employee benefit and paid the purchase price in cash on the same date. The approximate sale date indicated is also 12/12/2025. Over the prior three months, the same person, identified as Joshua Mook, sold 9,039 common shares on 11/17/2025 for gross proceeds of $15,000. The signer represents that they are not aware of undisclosed material adverse information about Hyliion’s operations.
Hyliion Holdings Corp stockholder Jose Oxholm has filed a Form 144 notice to sell 60,000 shares of common stock. The planned sale is to be executed through UBS Financial Services Inc., with an aggregate market value of $117,000, and is targeted for around 12/12/2025 on the NYSE. The shares were acquired on 12/12/2025 through an employee benefit transaction, with 60,000 shares paid for in cash. Over the prior three months, Jose Oxholm sold an additional 31,105 common shares on 11/17/2025 for gross proceeds of $51,600.
Hyliion Holdings Corp. reported a small insider stock sale by its Chief Strategy Officer. On 12/03/2025, the officer disposed of 2,700 shares of common stock at $1.86 per share. The filing explains these shares were sold at the issuer’s direction under an award agreement to cover the officer’s tax withholding obligations, meaning the sale was tied to equity compensation rather than an open-market portfolio decision. After this transaction, the officer beneficially owned 762,550 shares of Hyliion common stock.
Hyliion Holdings Corp has a shareholder filing a Rule 144 notice to sell common stock. The filing covers a proposed sale of 50,000 common shares through UBS Financial Services Inc. on the NYSE, with an indicated aggregate market value of $100,000. The issuer had 175,974,228 common shares outstanding at the time referenced. The shares to be sold were acquired on 12/03/2025 as part of an employee benefit arrangement, with payment on the same date. The form also notes that the same seller disposed of 25,218 common shares on 11/17/2025 for gross proceeds of $41,862, and includes a representation that the seller is not aware of undisclosed material adverse information about Hyliion’s operations.
Hyliion Holdings Corp. reported a routine insider share withholding by its Chief Financial Officer, Jon Panzer. On 11/28/2025, 2,435 shares of common stock were withheld at a price of $1.88 per share to cover tax obligations arising from the vesting and distribution of restricted stock units. After this tax-related transaction, Panzer beneficially owned 889,790 shares of Hyliion common stock in direct ownership. The filing is a standard Form 4 disclosure required for company insiders.
Hyliion Holdings Corp. reported an insider equity transaction by its Chief Accounting Officer. On 11/27/2025, 519 shares of Hyliion common stock were withheld at a price of $1.85 per share to cover tax liabilities arising from the vesting and distribution of restricted stock units. After this tax withholding, the reporting person directly beneficially owned 225,898 shares of Hyliion common stock. The filing indicates this is a Form 4 filed by one reporting person serving as an officer of the company.
Hyliion Holdings Corp. reported an equity transaction involving its Chief Technology Officer, who is an officer of the company and filed individually. On November 26, 2025, the officer acquired 540,541 shares of common stock at $1.85 per share, recorded as an acquisition of securities. Following this transaction, the officer beneficially owned 1,048,113 shares directly.
The filing explains that this reflects a grant of restricted stock units under Hyliion’s 2024 Equity Incentive Plan. One-fifth of the award will vest on November 26, 2026, one-fifth on November 26, 2027, and three-fifths on November 26, 2028. On November 27, 2025, 1,361 shares were disposed of at $1.85 per share, representing shares withheld to cover tax liabilities related to vesting and distribution, leaving 1,046,752 shares beneficially owned directly.
Hyliion Holdings Corp. insider filing reports a routine tax-related share sale. The company’s Chief Legal & Compliance Officer, Jose Miguel Oxholm, sold 31,105 shares of Hyliion common stock on 11/17/2025 at a price of $1.66 per share. These shares were sold at the direction of the issuer under the terms of an award agreement, which allows the issuer to decide whether to sell shares to cover the officer’s tax withholding obligations.
The filing explains that this sale includes shares used to cover tax withholding for equity awards vesting on August 25, November 13, and November 14, 2025. Due to an administrative error by a third-party service provider, cash was initially used to cover the August 25 tax obligation, and the related share sale could not occur until the next open trading window. As a result, the portion of shares tied to the August 25 vesting was sold on November 17, 2025. After this transaction, the officer beneficially owned 779,050 shares, held directly.