DORM · Dorman Products, Inc.

Represents shares of the Issuer's common stock sold by the reporting person in accordance with a Rule 10b5-1 trading arrangement adopted by the reporting person on August 20, 2025.

The amount reported includes 62.075 shares acquired by the Reporting Person under Dorman's employee stock purchase plan on June 30, 2026.

The option vests in four equal annual installments beginning on March 2, 2023, which was the first anniversary of the date of grant.

The option vests in four equal annual installments beginning on March 2, 2024, which was the first anniversary of the date of grant.

These shares were withheld by the Issuer upon the vesting of restricted stock units to satisfy the Reporting Person's tax withholding obligations. Such withholding is treated as a disposition of securities under Section 16 of the Securities Exchange Act of 1934, as amended.

These shares were withheld by the Issuer upon the vesting of restricted stock units to satisfy the Reporting Person's tax withholding obligations. Such withholding is treated as a disposition of securities under Section 16 of the Securities Exchange Act of 1934, as amended.

Grant of restricted stock units representing a contingent right to receive shares of Dorman common stock. The restricted stock units will vest in three equal annual installments beginning on March 2, 2027.

Grant of restricted stock units representing a contingent right to receive shares of Dorman common stock. The restricted stock units will vest in full on the earlier of the first anniversary of the date of grant or the date of the Company's next annual meeting of shareholders.

Grant of restricted stock units representing a contingent right to receive shares of Dorman common stock. The restricted stock units will vest in full on the earlier of the first anniversary of the date of grant or the date of the Company's next annual meeting of shareholders.

Grant of restricted stock units representing a contingent right to receive shares of Dorman common stock. The restricted stock units will vest in full on the earlier of the first anniversary of the date of grant or the date of the Company's next annual meeting of shareholders.

Grant of restricted stock units representing a contingent right to receive shares of Dorman common stock. The restricted stock units will vest in full on the earlier of the first anniversary of the date of grant or the date of the Company's next annual meeting of shareholders.

Grant of restricted stock units representing a contingent right to receive shares of Dorman common stock. The restricted stock units will vest in full on the earlier of the first anniversary of the date of grant or the date of the Company's next annual meeting of shareholders.

Grant of restricted stock units representing a contingent right to receive shares of Dorman common stock. The restricted stock units will vest in full on the earlier of the first anniversary of the date of grant or the date of the Company's next annual meeting of shareholders.

Grant of restricted stock units representing a contingent right to receive shares of Dorman common stock. The restricted stock units will vest in full on the earlier of the first anniversary of the date of grant or the date of the Company's next annual meeting of shareholders.

These shares were withheld by the Issuer upon the vesting of restricted stock units to satisfy the Reporting Person's tax withholding obligations. Such withholding is treated as a disposition of securities under Section 16 of the Securities Exchange Act of 1934, as amended.

These shares were withheld by the Issuer upon the vesting of restricted stock units to satisfy the Reporting Person's tax withholding obligations. Such withholding is treated as a disposition of securities under Section 16 of the Securities Exchange Act of 1934, as amended.

These shares were withheld by the Issuer upon the vesting of restricted stock units to satisfy the Reporting Person's tax withholding obligations. Such withholding is treated as a disposition of securities under Section 16 of the Securities Exchange Act of 1934, as amended.

These shares were withheld by the Issuer upon the vesting of restricted stock units to satisfy the Reporting Person's tax withholding obligations. Such withholding is treated as a disposition of securities under Section 16 of the Securities Exchange Act of 1934, as amended.

Represents shares of the Issuer's common stock sold by the reporting person in accordance with a Rule 10b5-1 trading arrangement adopted by the reporting person on August 20, 2025.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $102.775 through $103.731. The reporting person undertakes to provide to Dorman Products, Inc., any security holder of Dorman Products, Inc. or the Staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

Represents shares of the Issuer's common stock sold by the reporting person in accordance with a Rule 10b5-1 trading arrangement adopted by the reporting person on August 20, 2025.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $101.774 through $102.772. The reporting person undertakes to provide to Dorman Products, Inc., any security holder of Dorman Products, Inc. or the Staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

Represents shares of the Issuer's common stock sold by the reporting person in accordance with a Rule 10b5-1 trading arrangement adopted by the reporting person on August 20, 2025.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $103.785 through $104.454. The reporting person undertakes to provide to Dorman Products, Inc., any security holder of Dorman Products, Inc. or the Staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

These shares were withheld by the Issuer upon the vesting of restricted stock units to satisfy the Reporting Person's tax withholding obligations. Such withholding is treated as a disposition of securities under Section 16 of the Securities Exchange Act of 1934, as amended.

These shares were withheld by the Issuer upon the vesting of restricted stock units to satisfy the Reporting Person's tax withholding obligations. Such withholding is treated as a disposition of securities under Section 16 of the Securities Exchange Act of 1934, as amended.

These shares were withheld by the Issuer upon the vesting of restricted stock units to satisfy the Reporting Person's tax withholding obligations. Such withholding is treated as a disposition of securities under Section 16 of the Securities Exchange Act of 1934, as amended.

These shares were withheld by the Issuer upon the vesting of restricted stock units to satisfy the Reporting Person's tax withholding obligations. Such withholding is treated as a disposition of securities under Section 16 of the Securities Exchange Act of 1934, as amended.

These shares were withheld by the Issuer upon the vesting of restricted stock units to satisfy the Reporting Person's tax withholding obligations. Such withholding is treated as a disposition of securities under Section 16 of the Securities Exchange Act of 1934, as amended.

These shares were withheld by the Issuer upon the vesting of restricted stock units to satisfy the Reporting Person's tax withholding obligations. Such withholding is treated as a disposition of securities under Section 16 of the Securities Exchange Act of 1934, as amended.

These shares were withheld by the Issuer upon the vesting of restricted stock units to satisfy the Reporting Person's tax withholding obligations. Such withholding is treated as a disposition of securities under Section 16 of the Securities Exchange Act of 1934, as amended.

These shares were withheld by the Issuer upon the vesting of restricted stock units to satisfy the Reporting Person's tax withholding obligations. Such withholding is treated as a disposition of securities under Section 16 of the Securities Exchange Act of 1934, as amended.

These shares were withheld by the Issuer upon the vesting of restricted stock units to satisfy the Reporting Person's tax withholding obligations. Such withholding is treated as a disposition of securities under Section 16 of the Securities Exchange Act of 1934, as amended.

These shares were withheld by the Issuer upon the vesting of restricted stock units to satisfy the Reporting Person's tax withholding obligations. Such withholding is treated as a disposition of securities under Section 16 of the Securities Exchange Act of 1934, as amended.

These shares were withheld by the Issuer upon the vesting of restricted stock units to satisfy the Reporting Person's tax withholding obligations. Such withholding is treated as a disposition of securities under Section 16 of the Securities Exchange Act of 1934, as amended.

These shares were withheld by the Issuer upon the vesting of restricted stock units to satisfy the Reporting Person's tax withholding obligations. Such withholding is treated as a disposition of securities under Section 16 of the Securities Exchange Act of 1934, as amended.

These shares were withheld by the Issuer upon the vesting of restricted stock units to satisfy the Reporting Person's tax withholding obligations. Such withholding is treated as a disposition of securities under Section 16 of the Securities Exchange Act of 1934, as amended.

Grant of restricted stock units representing a contingent right to receive shares of Dorman common stock. The restricted stock units will vest in three equal annual installments beginning on March 2, 2027, which is the first anniversary of the date of grant.

These shares were withheld by the Issuer upon the vesting of restricted stock units to satisfy the Reporting Person's tax withholding obligations. Such withholding is treated as a disposition of securities under Section 16 of the Securities Exchange Act of 1934, as amended.

Grant of restricted stock units representing a contingent right to receive shares of Dorman common stock. The restricted stock units will vest in three equal annual installments beginning on March 2, 2027, which is the first anniversary of the date of grant.

These shares were withheld by the Issuer upon the vesting of restricted stock units to satisfy the Reporting Person's tax withholding obligations. Such withholding is treated as a disposition of securities under Section 16 of the Securities Exchange Act of 1934, as amended.

The amount reported includes 62.3382 shares acquired by the Reporting Person under Dorman's employee stock purchase plan on June 30, 2025 and 62.0750 shares acquired by the Reporting Person under Dorman's employee stock purchase plan on December 31, 2025.

Grant of restricted stock units representing a contingent right to receive shares of Dorman common stock. The restricted stock units will vest in three equal annual installments beginning on March 2, 2027, which is the first anniversary of the date of grant.

These shares were withheld by the Issuer upon the vesting of restricted stock units to satisfy the Reporting Person's tax withholding obligations. Such withholding is treated as a disposition of securities under Section 16 of the Securities Exchange Act of 1934, as amended.

These shares were withheld by the Issuer upon the vesting of restricted stock units to satisfy the Reporting Person's tax withholding obligations. Such withholding is treated as a disposition of securities under Section 16 of the Securities Exchange Act of 1934, as amended.

These shares were withheld by the Issuer upon the vesting of restricted stock units to satisfy the Reporting Person's tax withholding obligations. Such withholding is treated as a disposition of securities under Section 16 of the Securities Exchange Act of 1934, as amended.

These shares were withheld by the Issuer upon the vesting of restricted stock units to satisfy the Reporting Person's tax withholding obligations. Such withholding is treated as a disposition of securities under Section 16 of the Securities Exchange Act of 1934, as amended.

These shares were withheld by the Issuer upon the vesting of restricted stock units to satisfy the Reporting Person's tax withholding obligations. Such withholding is treated as a disposition of securities under Section 16 of the Securities Exchange Act of 1934, as amended.

These shares were withheld by the Issuer upon the vesting of restricted stock units to satisfy the Reporting Person's tax withholding obligations. Such withholding is treated as a disposition of securities under Section 16 of the Securities Exchange Act of 1934, as amended.

Grant of restricted stock units representing a contingent right to receive shares of Dorman common stock. The restricted stock units will vest in three equal annual installments beginning on March 2, 2027, which is the first anniversary of the date of grant.

The amount reported includes 49.8705 shares acquired by the Reporting Person under Dorman's employee stock purchase plan on June 30, 2025 and 49.6600 shares acquired by the Reporting Person under Dorman's employee stock purchase plan on December 31, 2025.

These shares were withheld by the Issuer upon the vesting of restricted stock units to satisfy the Reporting Person's tax withholding obligations. Such withholding is treated as a disposition of securities under Section 16 of the Securities Exchange Act of 1934, as amended.