DORM

SEC source: 0001628280-26-014704 · wk-form4_1772661258.xml · nonDerivative · entry 3

Bowen Gregory C. · CIK 0002068014 · VP, Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,322.3428

F3 · shares: 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.

SEC source: 0001628280-26-014704 · wk-form4_1772661258.xml · nonDerivative · entry 2

Bowen Gregory C. · CIK 0002068014 · VP, Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,676.3428

F1 · shares: 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.

SEC source: 0001628280-26-014704 · wk-form4_1772661258.xml · nonDerivative · entry 1

Bowen Gregory C. · CIK 0002068014 · VP, Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,735.3428

F1 · shares: 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.

F2 · balance_after: 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.

SEC source: 0001628280-26-014705 · wk-form4_1772661264.xml · nonDerivative · entry 4

Luftig Eric · CIK 0001930948 · President, Light Duty

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 13,127.8476

F2 · shares: 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.

SEC source: 0001628280-26-014705 · wk-form4_1772661264.xml · nonDerivative · entry 3

Luftig Eric · CIK 0001930948 · President, Light Duty

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 8,815.8476

F1 · shares: 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.

SEC source: 0001628280-26-014705 · wk-form4_1772661264.xml · nonDerivative · entry 2

Luftig Eric · CIK 0001930948 · President, Light Duty

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 8,882.8476

F1 · shares: 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.

SEC source: 0001628280-26-014705 · wk-form4_1772661264.xml · nonDerivative · entry 1

Luftig Eric · CIK 0001930948 · President, Light Duty

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,041.8476

F1 · shares: 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.

SEC source: 0001628280-26-014703 · wk-form4_1772661254.xml · nonDerivative · entry 3

Olsen Kevin M. · CIK 0001675629 · Director · President and CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 103,933.0283

F2 · shares: 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.

SEC source: 0001628280-26-014703 · wk-form4_1772661254.xml · nonDerivative · entry 2

Olsen Kevin M. · CIK 0001675629 · Director · President and CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 86,682.0283

F1 · shares: 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.

SEC source: 0001628280-26-014703 · wk-form4_1772661254.xml · nonDerivative · entry 1

Olsen Kevin M. · CIK 0001675629 · Director · President and CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 87,397.0283

F1 · shares: 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.

SEC source: 0001628280-26-014702 · wk-form4_1772661249.xml · nonDerivative · entry 1

Pacheco Kathleen · CIK 0002068005 · President, Specialty Vehicle

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,784.5305

F1 · shares: 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.

F2 · balance_after: 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.

SEC source: 0001628280-26-014701 · wk-form4_1772661245.xml · nonDerivative · entry 3

Leff Scott · CIK 0001930959 · SVP, CHRO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 18,544.2428

F2 · shares: 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.

SEC source: 0001628280-26-014701 · wk-form4_1772661245.xml · nonDerivative · entry 2

Leff Scott · CIK 0001930959 · SVP, CHRO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 15,310.2428

F1 · shares: 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.

SEC source: 0001628280-26-014701 · wk-form4_1772661245.xml · nonDerivative · entry 1

Leff Scott · CIK 0001930959 · SVP, CHRO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 15,402.2428

F1 · shares: 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.

SEC source: 0001628280-26-014700 · wk-form4_1772661240.xml · nonDerivative · entry 3

Long Donna M. · CIK 0001931700 · SVP, CIO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 21,771.8738

F2 · shares: 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.

SEC source: 0001628280-26-014700 · wk-form4_1772661240.xml · nonDerivative · entry 2

Long Donna M. · CIK 0001931700 · SVP, CIO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 19,184.8738

F1 · shares: 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.

SEC source: 0001628280-26-014700 · wk-form4_1772661240.xml · nonDerivative · entry 1

Long Donna M. · CIK 0001931700 · SVP, CIO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 19,274.8738

F1 · shares: 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.

SEC source: 0001628280-26-014699 · wk-form4_1772661234.xml · nonDerivative · entry 3

Braun Joseph P. · CIK 0001775023 · SVP and General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 21,265.5828

F2 · shares: 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.

SEC source: 0001628280-26-014699 · wk-form4_1772661234.xml · nonDerivative · entry 2

Braun Joseph P. · CIK 0001775023 · SVP and General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 16,953.5828

F1 · shares: 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.

SEC source: 0001628280-26-014699 · wk-form4_1772661234.xml · nonDerivative · entry 1

Braun Joseph P. · CIK 0001775023 · SVP and General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 17,074.5828

F1 · shares: 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.

SEC source: 0001628280-26-010699 · wk-form4_1771883069.xml · nonDerivative · entry 2

Olsen Kevin M. · CIK 0001675629 · Director · President and CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 87,905.0283

F3 · shares: 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.

SEC source: 0001628280-26-010699 · wk-form4_1771883069.xml · nonDerivative · entry 1

Olsen Kevin M. · CIK 0001675629 · Director · President and CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 97,369.0283

F1 · shares: Represents the settlement of performance-based restricted stock units granted in fiscal 2023 for the 2023-2025 performance cycle.

F2 · balance_after: The amount reported includes 195.46130 shares of Dorman common stock acquired by the Reporting Person under Dorman's employee stock purchase plan since the date of the Reporting Person's last Form 4.

SEC source: 0001628280-26-010630 · wk-form4_1771881464.xml · nonDerivative · entry 2

Luftig Eric · CIK 0001930948 · President, Light Duty

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,102.8476

F2 · shares: 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.

SEC source: 0001628280-26-010630 · wk-form4_1771881464.xml · nonDerivative · entry 1

Luftig Eric · CIK 0001930948 · President, Light Duty

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 10,021.8476

F1 · shares: Represents the settlement of performance-based restricted stock units granted in fiscal 2023 for the 2023-2025 performance cycle.

SEC source: 0001628280-26-010623 · wk-form4_1771881358.xml · nonDerivative · entry 2

Hession David · CIK 0001769146 · SVP and CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 8,017.358

F3 · shares: 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.

SEC source: 0001628280-26-010623 · wk-form4_1771881358.xml · nonDerivative · entry 1

Hession David · CIK 0001769146 · SVP and CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,906.358

F1 · shares: Represents the settlement of performance-based restricted stock units granted in fiscal 2023 for the 2023-2025 performance cycle.

F2 · balance_after: The amount reported includes 112.2087 shares acquired by the Reporting Person under Dorman's employee stock purchase plan on June 30, 2025 and 83.5130 shares acquired by the Reporting Person under Dorman's employee stock purchase plan on December 31, 2025.

SEC source: 0001628280-26-010620 · wk-form4_1771881305.xml · nonDerivative · entry 2

Leff Scott · CIK 0001930959 · SVP, CHRO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 15,469.2428

F2 · shares: 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.

SEC source: 0001628280-26-010620 · wk-form4_1771881305.xml · nonDerivative · entry 1

Leff Scott · CIK 0001930959 · SVP, CHRO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 16,728.2428

F1 · shares: Represents the settlement of performance-based restricted stock units granted in fiscal 2023 for the 2023-2025 performance cycle.

SEC source: 0001628280-26-010612 · wk-form4_1771881182.xml · nonDerivative · entry 2

Braun Joseph P. · CIK 0001775023 · SVP and General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 17,165.5828

F2 · shares: 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.

SEC source: 0001628280-26-010612 · wk-form4_1771881182.xml · nonDerivative · entry 1

Braun Joseph P. · CIK 0001775023 · SVP and General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 18,805.5828

F1 · shares: Represents the settlement of performance-based restricted stock units granted in fiscal 2023 for the 2023-2025 performance cycle.

SEC source: 0001628280-26-010615 · wk-form4_1771881220.xml · nonDerivative · entry 2

Long Donna M. · CIK 0001931700 · SVP, CIO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 19,340.8738

F2 · shares: 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.

SEC source: 0001628280-26-010615 · wk-form4_1771881220.xml · nonDerivative · entry 1

Long Donna M. · CIK 0001931700 · SVP, CIO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 20,570.8738

F1 · shares: Represents the settlement of performance-based restricted stock units granted in fiscal 2023 for the 2023-2025 performance cycle.

SEC source: 0001628280-26-000973 · wk-form4_1767739208.xml · nonDerivative · entry 1

Luftig Eric · CIK 0001930948 · Senior Vice President, Product

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,985.8476

F1 · shares: 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.

F2 · balance_after: The amount shown includes an additional 192.9757 shares of Dorman common stock that have been acquired by the Reporting Person under Dorman's employee stock purchase plan since the Reporting Person's last Form 4 filing.

SEC source: 0001628280-26-000946 · wk-form4_1767736377.xml · nonDerivative · entry 3

Long Donna M. · CIK 0001931700 · SVP, CIO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 17,855.8738

F1 · shares: 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.

F4 · shares: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $124.02 through $125.01. 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.

SEC source: 0001628280-26-000946 · wk-form4_1767736377.xml · nonDerivative · entry 2

Long Donna M. · CIK 0001931700 · SVP, CIO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 18,041.8738

F1 · shares: 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.

F3 · shares: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $123.03 through $124.01. 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.

SEC source: 0001628280-26-000946 · wk-form4_1767736377.xml · nonDerivative · entry 1

Long Donna M. · CIK 0001931700 · SVP, CIO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 18,614.8738

F1 · shares: 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.

F2 · shares: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $122.05 through $123.01. 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.

SEC source: 0001628280-26-006102 · wk-form4_1770414613.xml · nonDerivative · entry 1

BERMAN STEVEN L · CIK 0001205405 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 760,498

SEC source: 0001628280-25-057154 · wk-form4_1765838787.xml · nonDerivative · entry 1

McKnight John · CIK 0001932069 · President, Heavy Duty

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,112.1061

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $128.53 to $129.26. 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.

SEC source: 0001628280-25-054995 · wk-form4_1764795950.xml · derivative · entry 10

McKnight John · CIK 0001932069 · President, Heavy Duty

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,406

Underlying: Common Stock · 703 shares

Expires 2031-03-02

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F6 · derivative.exercise_date: The option vests in four equal annual installments beginning on March 2, 2024, which is the first anniversary of the date of grant.

SEC source: 0001628280-25-054995 · wk-form4_1764795950.xml · derivative · entry 9

McKnight John · CIK 0001932069 · President, Heavy Duty

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 623

Underlying: Common Stock · 623 shares

Expires 2030-03-02

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F5 · derivative.exercise_date: The option vests in four equal annual installments beginning on March 2, 2023, which is the first anniversary of the date of grant.

SEC source: 0001628280-25-054995 · wk-form4_1764795950.xml · derivative · entry 8

McKnight John · CIK 0001932069 · President, Heavy Duty

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 1,950 shares

Expires 2029-03-02

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F4 · derivative.exercise_date: The option vests in four equal annual installments beginning on March 2, 2022, which was the first anniversary of the date of grant.

SEC source: 0001628280-25-054995 · wk-form4_1764795950.xml · derivative · entry 7

McKnight John · CIK 0001932069 · President, Heavy Duty

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,392

Underlying: Common Stock · 1,356 shares

Expires 2027-11-01

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_date: The option vests in four equal annual installments beginning on November 1, 2020, which was the first anniversary of the date of grant.

SEC source: 0001628280-25-054995 · wk-form4_1764795950.xml · nonDerivative · entry 6

McKnight John · CIK 0001932069 · President, Heavy Duty

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,112.1061

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $131.175 to $131.35. 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.

SEC source: 0001628280-25-054995 · wk-form4_1764795950.xml · nonDerivative · entry 5

McKnight John · CIK 0001932069 · President, Heavy Duty

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,023.1061

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $130.18 to $131.135. 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.

SEC source: 0001628280-25-054995 · wk-form4_1764795950.xml · nonDerivative · entry 4

McKnight John · CIK 0001932069 · President, Heavy Duty

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 16,010.1061

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001628280-25-054995 · wk-form4_1764795950.xml · nonDerivative · entry 3

McKnight John · CIK 0001932069 · President, Heavy Duty

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 15,307.1061

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001628280-25-054995 · wk-form4_1764795950.xml · nonDerivative · entry 2

McKnight John · CIK 0001932069 · President, Heavy Duty

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 14,684.1061

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001628280-25-054995 · wk-form4_1764795950.xml · nonDerivative · entry 1

McKnight John · CIK 0001932069 · President, Heavy Duty

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,734.1061

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001628280-25-048285 · wk-form4_1762204959.xml · nonDerivative · entry 3

Hession David · CIK 0001769146 · SVP and CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,638.6363

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $136.01 through $136.90. 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.

SEC source: 0001628280-25-048285 · wk-form4_1762204959.xml · nonDerivative · entry 2

Hession David · CIK 0001769146 · SVP and CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 8,496.6363

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $135.03 through $135.97. 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.