HYLN · Hyliion Holdings Corp.

Represents a bona fide gift of 2,500,000 shares of Common Stock by the Reporting Person to the TH 2026 Irrevocable Trust, dated June 26, 2026, for estate planning purposes, for which no payment or other consideration was received. The trust beneficiaries include members of the Reporting Person's family and future descendants. Consistent with the trust's estate planning objectives, the Reporting Person is neither a trustee nor a beneficiary of the trust and does not have or share voting or investment power over the shares held by the trust.

Shares were transferred as a bona fide gift from the reporting person to family members. No funds were exchanged and no sale of shares occurred in the transfer.

These shares were sold at the direction of the issuer under the terms of the issuer's award agreement with the reporting person. Under the award agreement, the decision to sell shares to cover the reporting person's tax withholding obligations is at the sole discretion of the issuer.

These shares were sold at the direction of the issuer under the terms of the issuer's award agreement with the reporting person. Under the award agreement, the decision to sell shares to cover the reporting person's tax withholding obligations is at the sole discretion of the issuer.

These shares were sold at the direction of the issuer under the terms of the issuer's award agreement with the reporting person. Under the award agreement, the decision to sell shares to cover the reporting person's tax withholding obligations is at the sole discretion of the issuer.

These shares were sold at the direction of the issuer under the terms of the issuer's award agreement with the reporting person. Under the award agreement, the decision to sell shares to cover the reporting person's tax withholding obligations is at the sole discretion of the issuer.

These shares were sold at the direction of the issuer under the terms of the issuer's award agreement with the reporting person. Under the award agreement, the decision to sell shares to cover the reporting person's tax withholding obligations is at the sole discretion of the issuer.

These shares were sold at the direction of the issuer under the terms of the issuer's award agreement with the reporting person. Under the award agreement, the decision to sell shares to cover the reporting person's tax withholding obligations is at the sole discretion of the issuer.

These shares were sold at the direction of the issuer under the terms of the issuer's award agreement with the reporting person. Under the award agreement, the decision to sell shares to cover the reporting person's tax withholding obligations is at the sole discretion of the issuer.

These shares were sold at the direction of the issuer under the terms of the issuer's award agreement with the reporting person. Under the award agreement, the decision to sell shares to cover the reporting person's tax withholding obligations is at the sole discretion of the issuer.

These shares were sold at the direction of the issuer under the terms of the issuer's award agreement with the reporting person. Under the award agreement, the decision to sell shares to cover the reporting person's tax withholding obligations is at the sole discretion of the issuer.

These shares were sold at the direction of the issuer under the terms of the issuer's award agreement with the reporting person. Under the award agreement, the decision to sell shares to cover the reporting person's tax withholding obligations is at the sole discretion of the issuer.

These shares were sold at the direction of the issuer under the terms of the issuer's award agreement with the reporting person. Under the award agreement, the decision to sell shares to cover the reporting person's tax withholding obligations is at the sole discretion of the issuer.

These shares were sold at the direction of the issuer under the terms of the issuer's award agreement with the reporting person. Under the award agreement, the decision to sell shares to cover the reporting person's tax withholding obligations is at the sole discretion of the issuer.

These shares were sold at the direction of the issuer under the terms of the issuer's award agreement with the reporting person. Under the award agreement, the decision to sell shares to cover the reporting person's tax withholding obligations is at the sole discretion of the issuer.

These shares were sold at the direction of the issuer under the terms of the issuer's award agreement with the reporting person. Under the award agreement, the decision to sell shares to cover the reporting person's tax withholding obligations is at the sole discretion of the issuer.

These shares were sold at the direction of the issuer under the terms of the issuer's award agreement with the reporting person. Under the award agreement, the decision to sell shares to cover the reporting person's tax withholding obligations is at the sole discretion of the issuer.

These shares were sold at the direction of the issuer under the terms of the issuer's award agreement with the reporting person. Under the award agreement, the decision to sell shares to cover the reporting person's tax withholding obligations is at the sole discretion of the issuer.

These shares were sold at the direction of the issuer under the terms of the issuer's award agreement with the reporting person. Under the award agreement, the decision to sell shares to cover the reporting person's tax withholding obligations is at the sole discretion of the issuer.

These shares were sold at the direction of the issuer under the terms of the issuer's award agreement with the reporting person. Under the award agreement, the decision to sell shares to cover the reporting person's tax withholding obligations is at the sole discretion of the issuer.

These shares were sold at the direction of the issuer under the terms of the issuer's award agreement with the reporting person. Under the award agreement, the decision to sell shares to cover the reporting person's tax withholding obligations is at the sole discretion of the issuer.

The Reporting Person received a grant of restricted stock units ("RSU Award") pursuant to the Issuer's 2024 Equity Incentive Plan. One-third (1/3) of the RSU Award will vest on February 11, 2027, and the remaining two-thirds (2/3) of the RSU Award will vest quarterly in equal amounts over a two-year period thereafter.

The Reporting Person received a grant of performance stock incentive units ("PSU Award") pursuant to the Issuer's 2024 Equity Incentive Plan. The award is contingent upon achieving underlying closing stock price thresholds ranging from $4.00 to $7.00 per share over a 90 to 180-calendar-day average by December 31, 2028.

The Reporting Person received a grant of restricted stock units ("RSU Award") pursuant to the Issuer's 2024 Equity Incentive Plan. The RSU Award will vest on February 11, 2027.

The Reporting Person received a grant of restricted stock units ("RSU Award") pursuant to the Issuer's 2024 Equity Incentive Plan. One-third (1/3) of the RSU Award will vest on February 11, 2027, and the remaining two-thirds (2/3) of the RSU Award will vest quarterly in equal amounts over a two-year period thereafter.

The Reporting Person received a grant of performance stock incentive units ("PSU Award") pursuant to the Issuer's 2024 Equity Incentive Plan. The award is contingent upon achieving underlying closing stock price thresholds ranging from $4.00 to $7.00 per share over a 90 to 180-calendar-day average by December 31, 2028.

The Reporting Person received a grant of restricted stock units ("RSU Award") pursuant to the Issuer's 2024 Equity Incentive Plan. The RSU Award will vest on February 11, 2027.

The Reporting Person received a grant of performance stock incentive units ("PSU Award") pursuant to the Issuer's 2024 Equity Incentive Plan. The award is contingent upon achieving underlying closing stock price thresholds ranging from $4.00 to $7.00 per share over a 90 to 180-calendar-day average by December 31, 2028.

The Reporting Person received a grant of restricted stock units ("RSU Award") pursuant to the Issuer's 2024 Equity Incentive Plan. The RSU Award will vest on February 11, 2027.

The Reporting Person received a grant of restricted stock units ("RSU Award") pursuant to the Issuer's 2024 Equity Incentive Plan. The RSU Award will vest on February 11, 2027.

The Reporting Person received a grant of performance stock incentive units ("PSU Award") pursuant to the Issuer's 2024 Equity Incentive Plan. The award is contingent upon achieving underlying closing stock price thresholds ranging from $4.00 to $7.00 per share over a 90 to 180-calendar-day average by December 31, 2028.

The Reporting Person received a grant of restricted stock units ("RSU Award") pursuant to the Issuer's 2024 Equity Incentive Plan. One-third (1/3) of the RSU Award will vest on February 11, 2027, and the remaining two-thirds (2/3) of the RSU Award will vest quarterly in equal amounts over a two-year period thereafter.

The Reporting Person received a grant of restricted stock units ("RSU Award") pursuant to the Issuer's 2024 Equity Incentive Plan. The RSU Award will vest on February 11, 2027.

The Reporting Person received a grant of restricted stock units ("RSU Award") pursuant to the Issuer's 2024 Equity Incentive Plan. One-third (1/3) of the RSU Award will vest on February 11, 2027, and the remaining two-thirds (2/3) of the RSU Award will vest quarterly in equal amounts over a two-year period thereafter.

The Reporting Person received a grant of restricted stock units ("RSU Award") pursuant to the Issuer's 2024 Equity Incentive Plan. One-third (1/3) of the RSU Award will vest on February 11, 2027, and the remaining two-thirds (2/3) of the RSU Award will vest quarterly in equal amounts over a two-year period thereafter.

The Reporting Person received a grant of restricted stock units ("RSU Award") pursuant to the Issuer's 2024 Equity Incentive Plan. One-third (1/3) of the RSU Award will vest on February 11, 2027, and the remaining two-thirds (2/3) of the RSU Award will vest quarterly in equal amounts over a two-year period thereafter.

The Reporting Person received a grant of performance stock incentive units ("PSU Award") pursuant to the Issuer's 2024 Equity Incentive Plan. The award is contingent upon achieving underlying closing stock price thresholds ranging from $4.00 to $7.00 per share over a 90 to 180-calendar-day average by December 31, 2028.

The Reporting Person received a grant of restricted stock units ("RSU Award") pursuant to the Issuer's 2024 Equity Incentive Plan. The RSU Award will vest on February 11, 2027.

The Reporting Person received a grant of performance stock incentive units ("PSU Award") pursuant to the Issuer's 2024 Equity Incentive Plan. The award is contingent upon achieving underlying closing stock price thresholds ranging from $4.00 to $7.00 per share over a 90 to 180-calendar-day average by December 31, 2028.

The Reporting Person received a grant of restricted stock units ("RSU Award") pursuant to the Issuer's 2024 Equity Incentive Plan. The RSU Award will vest on February 11, 2027.

These shares were sold at the direction of the issuer under the terms of the issuer's award agreement with the reporting person. Under the award agreement, the decision to sell shares to cover the reporting person's tax withholding obligations is at the sole discretion of the issuer.

These shares were sold at the direction of the issuer under the terms of the issuer's award agreement with the reporting person. Under the award agreement, the decision to sell shares to cover the reporting person's tax withholding obligations is at the sole discretion of the issuer.

These shares were sold at the direction of the issuer under the terms of the issuer's award agreement with the reporting person. Under the award agreement, the decision to sell shares to cover the reporting person's tax withholding obligations is at the sole discretion of the issuer.

These shares were sold at the direction of the issuer under the terms of the issuer's award agreement with the reporting person. Under the award agreement, the decision to sell shares to cover the reporting person's tax withholding obligations is at the sole discretion of the issuer.

These shares were sold at the direction of the issuer under the terms of the issuer's award agreement with the reporting person. Under the award agreement, the decision to sell shares to cover the reporting person's tax withholding obligations is at the sole discretion of the issuer.

These shares were sold at the direction of the issuer under the terms of the issuer's award agreement with the reporting person. Under the award agreement, the decision to sell shares to cover the reporting person's tax withholding obligations is at the sole discretion of the issuer.

These shares were sold at the direction of the issuer under the terms of the issuer's award agreement with the reporting person. Under the award agreement, the decision to sell shares to cover the reporting person's tax withholding obligations is at the sole discretion of the issuer.

These shares were sold at the direction of the issuer under the terms of the issuer's award agreement with the reporting person. Under the award agreement, the decision to sell shares to cover the reporting person's tax withholding obligations is at the sole discretion of the issuer.

These shares were sold at the direction of the issuer under the terms of the issuer's award agreement with the reporting person. Under the award agreement, the decision to sell shares to cover the reporting person's tax withholding obligations is at the sole discretion of the issuer.

Shares withheld for the payment of a tax liability related to the vesting and distribution of restricted stock units.