[Form 4] Dorman Products, Inc. Insider Trading Activity

Rhea-AI Filing Summary

Dorman Products, Inc. reported insider equity transactions by an officer serving as President, Heavy Duty. On December 1, 2025, the officer exercised several employee stock options, acquiring common shares at exercise prices of $73.72, $101.45, $96.36, and $91.28 per share. These option exercises relate to grants that vest in four equal annual installments beginning between November 2020 and March 2024.

On the same date, the officer sold 3,987 shares at a weighted average price of $130.595 per share and 911 shares at a weighted average price of $131.19 per share, in multiple trades within the stated price ranges. After these transactions, the officer beneficially owned approximately 11,112.1061 shares of Dorman Products common stock directly.

Insider Trade Summary

Net Seller: 4,898 shares ($640,196)

Net Sell 10 txns

Insider McKnight John

Role President, Heavy Duty

Sold 4,898 shs ($640K)

Type	Security	Shares	Price	Value
Exercise	Employee Stock Option (right to buy)	1,356	$0.00	--
Exercise	Employee Stock Option (right to buy)	1,950	$0.00	--
Exercise	Employee Stock Option (right to buy)	623	$0.00	--
Exercise	Employee Stock Option (right to buy)	703	$0.00	--
Exercise	Common Stock	1,356	$73.72	$100K
Exercise	Common Stock	1,950	$101.45	$198K
Exercise	Common Stock	623	$96.36	$60K
Exercise	Common Stock	703	$91.28	$64K
Sale	Common Stock	3,987	$130.595	$521K
Sale	Common Stock	911	$131.19	$120K

Holdings After Transaction: Employee Stock Option (right to buy) — 1,392 shares (Direct); Common Stock — 12,734.106 shares (Direct)

Footnotes (1)

1. 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. 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. The option vests in four equal annual installments beginning on November 1, 2020, which was the first anniversary of the date of grant. The option vests in four equal annual installments beginning on March 2, 2022, which was the first anniversary of the date of grant. The option vests in four equal annual installments beginning on March 2, 2023, which is the first anniversary of the date of grant. The option vests in four equal annual installments beginning on March 2, 2024, which is the first anniversary of the date of grant.

Form 4 Insider Transactions: What Each Field Means →

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

McKnight John

(Last) (First) (Middle)

C/O DORMAN PRODUCTS, INC.

3400 EAST WALNUT STREET

(Street)

COLMAR PA 18915

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
Dorman Products, Inc. [ DORM ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	President, Heavy Duty

3. Date of Earliest Transaction (Month/Day/Year)
12/01/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	12/01/2025		M		1,356	A	$73.72	12,734.1061	D
Common Stock	12/01/2025		M		1,950	A	$101.45	14,684.1061	D
Common Stock	12/01/2025		M		623	A	$96.36	15,307.1061	D
Common Stock	12/01/2025		M		703	A	$91.28	16,010.1061	D
Common Stock	12/01/2025		S		3,987	D	$130.595(1)	12,023.1061	D
Common Stock	12/01/2025		S		911	D	$131.19(2)	11,112.1061	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Employee Stock Option (right to buy)	$73.72	12/01/2025		M			1,356	(3)	11/01/2027	Common Stock	1,356	$0	1,392	D
Employee Stock Option (right to buy)	$101.45	12/01/2025		M			1,950	(4)	03/02/2029	Common Stock	1,950	$0	0	D
Employee Stock Option (right to buy)	$96.36	12/01/2025		M			623	(5)	03/02/2030	Common Stock	623	$0	623	D
Employee Stock Option (right to buy)	$91.28	12/01/2025		M			703	(6)	03/02/2031	Common Stock	703	$0	1,406	D

Explanation of Responses:

1. 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.

2. 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.

3. The option vests in four equal annual installments beginning on November 1, 2020, which was the first anniversary of the date of grant.

4. The option vests in four equal annual installments beginning on March 2, 2022, which was the first anniversary of the date of grant.

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

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

Remarks:

The filing of this Statement shall not be construed as an admission (a) that the person filing this Statement is, for the purposes of Section 16 of the Securities Exchange Act of 1934, as amended, the beneficial owner of any securities covered by this Statement, or (b) that this Statement is legally required to be filed by such person.

	/s/ Frank J. Mahr, by Power of Attorney	12/03/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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