PRTS · CarParts.com, Inc. · Insider Trading

Shares were awarded pursuant to the CarParts.com, Inc. Director Payment Election Plan in lieu of retainer fees equal to $11,550.

This Form 4/A is being filed to correct the balances in column 5 to properly reflect the proper balances subsequent to the 10-to-1 reverse split.

This Form 4/A is being filed to correct the balances in column 5 to properly reflect the proper balances subsequent to the 10-to-1 reverse split.

Reflects cash-settled RSUs. Each RSU represents a contingent right to receive an amount in cash equal to the fair market value of one share of the Issuer's common stock on the applicable vesting date. The RSUs shall vest on the 2027 annual shareholder meeting date, as long as the Reporting Person's service with the Company has not previously ended.

Shares were awarded pursuant to the CarParts.com, Inc. Director Payment Election Plan in lieu of retainer fees equal to $11,550.

Reflects cash-settled RSUs. Each RSU represents a contingent right to receive an amount in cash equal to the fair market value of one share of the Issuer's common stock on the applicable vesting date. The RSUs shall vest on the 2027 annual shareholder meeting date, as long as the Reporting Person's service with the Company has not previously ended.

Reflects cash-settled RSUs. Each RSU represents a contingent right to receive an amount in cash equal to the fair market value of one share of the Issuer's common stock on the applicable vesting date. The RSUs shall vest on the 2027 annual shareholder meeting date, as long as the Reporting Person's service with the Company has not previously ended.

Reflects cash-settled RSUs. Each RSU represents a contingent right to receive an amount in cash equal to the fair market value of one share of the Issuer's common stock on the applicable vesting date. The RSUs shall vest on the 2027 annual shareholder meeting date, as long as the Reporting Person's service with the Company has not previously ended.

Reflects cash-settled RSUs. Each RSU represents a contingent right to receive an amount in cash equal to the fair market value of one share of the Issuer's common stock on the applicable vesting date. The RSUs shall vest on the 2027 annual shareholder meeting date, as long as the Reporting Person's service with the Company has not previously ended.

Reflects cash-settled RSUs. Each RSU represents a contingent right to receive an amount in cash equal to the fair market value of one share of the Issuer's common stock on the applicable vesting date. The RSUs shall vest on the 2027 annual shareholder meeting date, as long as the Reporting Person's service with the Company has not previously ended.

Effective April 8, 2026, the Board of Directors of the Company granted the Reporting Person Restricted Stock Awards (RSAs) pursuant to the CarParts.com, Inc. 2016 Equity Incentive Plan. The RSAs shall vest in three equal installments (33 1/3%) on each of the next three anniversaries of the grant date, subject to such Reporting Person's continuous service with the Company through each applicable vesting date.

Not applicable.

Effective April 8, 2026, the Board of Directors of the Company granted the Reporting Person Restricted Stock Awards (RSAs) pursuant to the CarParts.com, Inc. 2016 Equity Incentive Plan. The RSAs shall vest in three equal installments (33 1/3%) on each of the next three anniversaries of the grant date, subject to such Reporting Person's continuous service with the Company through each applicable vesting date.

Not applicable.

Effective April 8, 2026, the Board of Directors of the Company granted the Reporting Person Restricted Stock Awards (RSAs) pursuant to the CarParts.com, Inc. 2016 Equity Incentive Plan. The RSAs shall vest in three equal installments (33 1/3%) on each of the next three anniversaries of the grant date, subject to such Reporting Person's continuous service with the Company through each applicable vesting date.

Not applicable.

Shares were awarded pursuant to the CarParts.com, Inc. Director Payment Election Plan in lieu of retainer fees equal to $11,550.

Represents shares of common stock that have been withheld by the Company to satisfy tax withholding obligations in connection with the net settlement of vested Restricted Stock Units.

Not applicable.

Not applicable.

The Restricted Stock Units (RSU) were granted to the Reporting Person on February 6, 2023 pursuant to the CarParts.com, Inc. 2016 Equity Incentive Plan. Thirty-three and a third percent of the shares of stock subject to the RSU vested on February 6, 2026, the third, and final, anniversary of the grant date.

The Restricted Stock Units (RSU) were granted to the Reporting Person on February 6, 2023 pursuant to the CarParts.com, Inc. 2016 Equity Incentive Plan. Thirty-three and a third percent of the shares of stock subject to the RSU vested on February 6, 2026, the third, and final, anniversary of the grant date.

Not applicable.

The Restricted Stock Units (RSU) were granted to the Reporting Person on February 6, 2023 pursuant to the CarParts.com, Inc. 2016 Equity Incentive Plan. Thirty-three and a third percent of the shares of stock subject to the RSU vested on February 6, 2026, the third, and final, anniversary of the grant date.

Represents shares of common stock that have been withheld by the Company to satisfy tax withholding obligations in connection with the net settlement of vested Restricted Stock Units.

Represents shares of common stock that have been withheld by the Company to satisfy tax withholding obligations in connection with the net settlement of vested Restricted Stock Units.

The Restricted Stock Units (RSUs) were granted to the Reporting Person on January 16, 2024 pursuant to the CarParts.com, Inc. 2016 Equity Incentive Plan. Fifty percent of the RSUs vested on the first anniversary of the grant date on January 16, 2025, and the remainder of the RSUs vested in equal installments each quarter thereafter, including herein on January 16, 2026, the second anniversary of the grant date and final vesting.

The Restricted Stock Units (RSUs) were granted to the Reporting Person on January 16, 2024 pursuant to the CarParts.com, Inc. 2016 Equity Incentive Plan. Fifty percent of the RSUs vested on the first anniversary of the grant date on January 16, 2025, and the remainder of the RSUs vested in equal installments each quarter thereafter, including herein on January 16, 2026, the second anniversary of the grant date and final vesting.

Not applicable.

The Restricted Stock Units (RSU) were granted to the Reporting Person on January 16, 2024 pursuant to the CarParts.com, Inc. 2016 Equity Incentive Plan. Thirty-three and a third percent of the shares of stock subject to the RSU vested on January 16, 2026, the second anniversary of the grant date, and the remainder of the shares subject to the RSU will vest on the next, and thus last, anniversary of the grant date, subject to such Reporting Person's service to the Company through such date.

Not applicable.

The Restricted Stock Units (RSUs) were granted to the Reporting Person on January 16, 2024 pursuant to the CarParts.com, Inc. 2016 Equity Incentive Plan. Fifty percent of the RSUs vested on the first anniversary of the grant date on January 16, 2025, and the remainder of the RSUs vested in equal installments each quarter thereafter, including herein on January 16, 2026, the second anniversary of the grant date and final vesting.

The Restricted Stock Units (RSU) were granted to the Reporting Person on January 16, 2024 pursuant to the CarParts.com, Inc. 2016 Equity Incentive Plan. Thirty-three and a third percent of the shares of stock subject to the RSU vested on January 16, 2026, the second anniversary of the grant date, and the remainder of the shares subject to the RSU will vest on the next, and thus last, anniversary of the grant date, subject to such Reporting Person's service to the Company through such date.

The Restricted Stock Units (RSU) were granted to the Reporting Person on January 16, 2024 pursuant to the CarParts.com, Inc. 2016 Equity Incentive Plan. Thirty-three and a third percent of the shares of stock subject to the RSU vested on January 16, 2026, the second anniversary of the grant date, and the remainder of the shares subject to the RSU will vest on the next, and thus last, anniversary of the grant date, subject to such Reporting Person's service to the Company through such date.

The Restricted Stock Units (RSUs) were granted to the Reporting Person on January 16, 2024 pursuant to the CarParts.com, Inc. 2016 Equity Incentive Plan. Fifty percent of the RSUs vested on the first anniversary of the grant date on January 16, 2025, and the remainder of the RSUs vested in equal installments each quarter thereafter, including herein on January 16, 2026, the second anniversary of the grant date and final vesting.

Not applicable.

The Restricted Stock Units (RSU) were granted to the Reporting Person on January 16, 2024 pursuant to the CarParts.com, Inc. 2016 Equity Incentive Plan. Thirty-three and a third percent of the shares of stock subject to the RSU vested on January 16, 2026, the second anniversary of the grant date, and the remainder of the shares subject to the RSU will vest on the next, and thus last, anniversary of the grant date, subject to such Reporting Person's service to the Company through such date.

Not applicable.

The Restricted Stock Units (RSU) were granted to the Reporting Person on January 16, 2024 pursuant to the CarParts.com, Inc. 2016 Equity Incentive Plan. Thirty-three and a third percent of the shares of stock subject to the RSU vested on January 16, 2026, the second anniversary of the grant date, and the remainder of the shares subject to the RSU will vest on the next, and thus last, anniversary of the grant date, subject to such Reporting Person's service to the Company through such date.

Not applicable.

The Restricted Stock Units (RSUs) were granted to the Reporting Person on January 16, 2024 pursuant to the CarParts.com, Inc. 2016 Equity Incentive Plan. Fifty percent of the RSUs vested on the first anniversary of the grant date on January 16, 2025, and the remainder of the RSUs vested in equal installments each quarter thereafter, including herein on January 16, 2026, the second anniversary of the grant date and final vesting.

Not applicable.

The Restricted Stock Units (RSU) were granted to the Reporting Person on January 16, 2024 pursuant to the CarParts.com, Inc. 2016 Equity Incentive Plan. Thirty-three and a third percent of the shares of stock subject to the RSU vested on January 16, 2026, the second anniversary of the grant date, and the remainder of the shares subject to the RSU will vest on the next, and thus last, anniversary of the grant date, subject to such Reporting Person's service to the Company through such date.

The Restricted Stock Units (RSUs) were granted to the Reporting Person on January 16, 2024 pursuant to the CarParts.com, Inc. 2016 Equity Incentive Plan. Fifty percent of the RSUs vested on the first anniversary of the grant date on January 16, 2025, and the remainder of the RSUs vested in equal installments each quarter thereafter, including herein on January 16, 2026, the second anniversary of the grant date and final vesting.

Shares were awarded pursuant to the CarParts.com, Inc. Director Payment Election Plan in lieu of retainer fees equal to $11,550.

Represents shares of common stock that have been withheld by the Company to satisfy tax withholding obligations in connection with the net settlement of vested Restricted Stock Awards (RSAs).

Represents shares of common stock that have been withheld by the Company to satisfy tax withholding obligations in connection with the net settlement of vested Restricted Stock Awards (RSAs).