Form 4: Hyliion CTO Receives Significant RSU Grant

Hyliion Holdings Corp.'s Chief Technology Officer, Joshua T. Mook, was granted 540,541 restricted stock units, increasing his beneficial ownership.

Summary

• Joshua T. Mook, Chief Technology Officer of Hyliion Holdings Corp. (HYLN), was granted 540,541 shares of Common Stock in the form of Restricted Stock Units (RSU Award) on November 26, 2025, at a price of $1.85 per share.
• This RSU Award was issued pursuant to the Issuer's 2024 Equity Incentive Plan.
• Following this acquisition, Mr. Mook's beneficial ownership of Common Stock increased to 1,048,113 shares.
• On November 27, 2025, 1,361 shares were disposed of at $1.85 per share to cover tax liabilities related to the vesting and distribution of restricted stock units.
• After the tax-related disposition, Mr. Mook's beneficial ownership stands at 1,046,752 shares.
• The RSU Award vests in tranches: one-fifth (1/5) on November 26, 2026, one-fifth (1/5) on November 26, 2027, and three-fifths (3/5) on November 26, 2028.

Sentiment

Score: 7

Explanation: The grant of a significant number of restricted stock units to a key executive like the CTO is generally a positive signal, indicating alignment of interests and a commitment to long-term performance. The tax-related disposition is a routine event and does not detract from the overall positive sentiment of the grant.

Positives

• The Chief Technology Officer received a substantial grant of 540,541 restricted stock units, aligning his interests with long-term shareholder value.
• The RSU grant demonstrates the company's commitment to retaining and incentivizing key management personnel through equity compensation.

Negatives

• A minor disposition of 1,361 shares occurred to cover tax liabilities, which is a standard practice upon RSU vesting and not indicative of negative sentiment.

Future Outlook

The RSU grant includes a multi-year vesting schedule, with portions vesting on November 26, 2026, November 26, 2027, and November 26, 2028, indicating a long-term incentive structure for the Chief Technology Officer.

Industry Context

This filing reflects a standard practice of equity compensation for executive leadership within publicly traded technology and automotive companies, aiming to align management incentives with long-term company performance and shareholder value.

Related Party Transactions

• The grant of 540,541 restricted stock units to Joshua T. Mook, the Chief Technology Officer, constitutes a compensation-related transaction between the company and a key executive.

Stakeholder Impact

• Shareholders may view the significant RSU grant to the CTO positively, as it aligns management's financial interests with the company's long-term stock performance.
• Employees may see this as a sign of stability and commitment from leadership, potentially boosting morale.

Next Steps

• One-fifth of the RSU Award will vest on November 26, 2026.
• One-fifth of the RSU Award will vest on November 26, 2027.
• Three-fifths of the RSU Award will vest on November 26, 2028.

Key Dates

Keywords

Hyliion, HYLN, Form 4, RSU, Restricted Stock Units, Insider Transaction, Equity Grant, Joshua Mook, Chief Technology Officer, Beneficial Ownership