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

Dorman Products, Inc. senior vice president and CIO Donna M. Long sold a total of 947 shares of common stock in three open-market transactions on March 12, 2026 under a Rule 10b5-1 trading plan.

Rhea-AI Filing Summary

Dorman Products, Inc. senior vice president and CIO Donna M. Long sold a total of 947 shares of common stock in three open-market transactions on March 12, 2026 under a Rule 10b5-1 trading plan. Sale prices ranged from about $101.774 to $104.454 per share. After these trades, she directly holds 20,072.8738 shares.

Insider Trade Summary 10b5-1

Net Seller: 947 shares

Net Sell 3 txns

Insider Long Donna M.

Role SVP, CIO

Sold 947 shs ($98K)

Type	Security	Shares	Price	Value
Sale	Common Stock	318	$102.19	$32K
Sale	Common Stock	394	$103.21	$41K
Sale	Common Stock	235	$104.03	$24K

Holdings After Transaction: Common Stock — 20,072.8738 shares (Direct)

Footnotes (4)

1. F1. 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.
2. F2. 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.
3. F3. 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.
4. F4. 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.

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Accepted by SEC EDGAR 03/16/2026 - 04:14 PM Learn about SEC filing dates

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).

X

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^*

Long Donna M.

(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)
	SVP, CIO

3. Date of Earliest Transaction (Month/Day/Year)
03/12/2026

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	03/12/2026		S		318(1)	D	$102.19(2)	20,701.8738	D
Common Stock	03/12/2026		S		394(1)	D	$103.21(3)	20,307.8738	D
Common Stock	03/12/2026		S		235(1)	D	$104.03(4)	20,072.8738	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

Explanation of Responses:

1. 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.

2. 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.

3. 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.

4. 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.

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 equity 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	03/16/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.