October 31, 2025 - 144: Report of proposed sale of securities

144: Filer Information

Filer CIK

0001769146

Filer CCC

XXXXXXXX

Is this a LIVE or TEST Filing?

LIVE

TEST

Submission Contact Information

Name

Phone

E-Mail Address

144: Issuer Information

Name of Issuer

Dorman Products, Inc.

SEC File Number

000-18914

Address of Issuer

3400 E WALNUT ST
COLMAR
PENNSYLVANIA
18915

Phone

215-9971800

Name of Person for Whose Account the Securities are To Be Sold

Hession David

See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.

Relationship to Issuer

Officer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Stifel Nicolaus & Company Inc 501 N Broadway St Louis MO 63102	12493	1691200.1	30562644	10/31/2025	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	03/01/2020	Restricted Stock Vesting	Issuer	560	03/01/2020	Compensation
Common	03/06/2020	Restricted Stock Vesting	Issuer	117	03/06/2020	Compensation
Common	03/31/2020	ESPP Purchase	Issuer	356	03/31/2020	Cash
Common	03/01/2021	Restricted Stock Vesting	Issuer	605	03/01/2021	Compensation
Common	03/02/2021	Restricted Stock Vesting	Issuer	334	03/02/2021	Compensation
Common	03/06/2021	Restricted Stock Vesting	Issuer	115	03/06/2021	Compensation
Common	03/31/2021	ESPP Purchase	Issuer	148	03/31/2021	Cash
Common	09/30/2021	ESPP Purchase	Issuer	128	09/30/2021	Cash
Common	03/01/2022	Restricted Stock Vesting	Issuer	605	03/01/2022	Compensation
Common	03/02/2022	Restricted Stock Vesting	Issuer	138	03/02/2022	Compensation
Common	03/02/2022	Restricted Stock Vesting	Issuer	334	03/02/2022	Compensation
Common	03/06/2022	Restricted Stock Vesting	Issuer	115	03/06/2022	Compensation
Common	03/06/2022	Restricted Stock Vesting	Issuer	744	03/06/2022	Compensation
Common	06/30/2022	ESPP Purchase	Issuer	125	06/30/2022	Cash
Common	12/30/2022	ESPP Purchase	Issuer	99	12/30/2022	Cash
Common	02/22/2023	Restricted Stock Vesting	Issuer	2255	02/22/2023	Compensation
Common	03/02/2023	Restricted Stock Vesting	Issuer	334	03/02/2023	Compensation
Common	03/02/2023	Restricted Stock Vesting	Issuer	168	03/02/2023	Compensation
Common	03/02/2023	Restricted Stock Vesting	Issuer	138	03/02/2023	Compensation
Common	03/06/2023	Restricted Stock Vesting	Issuer	115	03/06/2023	Compensation
Common	06/30/2023	ESPP Purchase	Issuer	175	06/30/2023	Cash
Common	03/01/2024	Restricted Stock Vesting	Issuer	336	03/01/2024	Compensation
Common	03/01/2024	Restricted Stock Vesting	Issuer	138	03/01/2024	Compensation
Common	03/01/2024	Restricted Stock Vesting	Issuer	168	03/01/2024	Compensation
Common	03/01/2024	Restricted Stock Vesting	Issuer	220	03/01/2024	Compensation
Common	02/20/2025	Restricted Stock Vesting	Issuer	1404	02/20/2025	Compensation
Common	02/28/2025	Restricted Stock Vesting	Issuer	110	02/28/2025	Compensation
Common	02/28/2025	Restricted Stock Vesting	Issuer	1465	02/28/2025	Compensation
Common	02/28/2025	Restricted Stock Vesting	Issuer	132	02/28/2025	Compensation
Common	02/28/2025	Restricted Stock Vesting	Issuer	174	02/28/2025	Compensation
Common	03/04/2025	Restricted Stock Vesting	Issuer	638	03/04/2025	Compensation

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Nothing to Report

144: Remarks and Signature

Remarks

Date of Notice

10/31/2025

ATTENTION:

The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.

Signature

/s/ David Hession

Form: 144

FORM 144