Dorman CIO sells 734 shares at $135.21 each

Dorman Products, Inc. (DORM) reported an insider transaction by Donna M. Long, its Senior Vice President and Chief Information Officer.

Rhea-AI Filing Summary

Dorman Products, Inc. (DORM) reported an insider transaction by Donna M. Long, its Senior Vice President and Chief Information Officer. Long sold 734 shares of common stock on August 17, 2026 at a price of $135.21 per share, in a transaction reported as a sale in the open market or a private transaction. After this sale, she directly holds 19,338.8738 shares of Dorman Products common stock. The sale was made under a Rule 10b5-1 trading arrangement that she adopted on August 20, 2025.

Insider Trade Summary 10b5-1

Net Seller: 734 shares

Net Sell 1 txn

Insider Long Donna M.

Role SVP, CIO

Sold 734 shs ($99K)

Type	Security	Shares	Price	Value
Sale	Common Stock F1	734	$135.21	$99K

Holdings After Transaction: Common Stock — 19,338.8738 shares (Direct)

Footnotes (1)

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.

Key Figures

Shares sold: 734 shares Sale price per share: $135.21 per share Shares owned after transaction: 19,338.8738 shares +1 more

4 metrics

Shares sold 734 shares Common stock sale on August 17, 2026 by SVP, CIO Donna M. Long

Sale price per share $135.21 per share Price for the 734 shares of common stock sold on August 17, 2026

Shares owned after transaction 19,338.8738 shares Direct ownership of Dorman Products common stock following the reported sale

Rule 10b5-1 plan adoption date August 20, 2025 Date Donna M. Long adopted the trading arrangement governing the reported sale

Key Terms

Rule 10b5-1 trading arrangement, beneficial owner, Section 16 of the Securities Exchange Act of 1934, Form 4

4 terms

Rule 10b5-1 trading arrangement regulatory

"sold by the reporting person in accordance with a Rule 10b5-1 trading arrangement"

beneficial owner regulatory

"construed as an admission ... the beneficial owner of any equity securities"

A beneficial owner is the person who ultimately owns or controls a financial asset or property, even if their name isn't directly on official documents. Think of it like someone who secretly holds the keys to a safe deposit box—others may appear to have access, but the true owner is the one who benefits from what's inside. Identifying beneficial owners helps ensure transparency and prevent illegal activities like money laundering or fraud.

Section 16 of the Securities Exchange Act of 1934 regulatory

"for the purposes of Section 16 of the Securities Exchange Act of 1934"

A provision of federal securities law that requires company insiders—directors, officers and large shareholders—to publicly report their stock holdings and trades and to surrender any “short-swing” profits from purchases and sales within a six-month window. It acts like a rule that forces leaders to announce their trades and prevents quick buy-sell windfalls, giving investors transparency into insider activity and reducing opportunities for unfair gain.

Form 4 regulatory

"reported the 734-share sale of common stock on Form 4"

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did Dorman Products (DORM) report for Donna M. Long?

Dorman Products reported that Donna M. Long, SVP and CIO, sold 734 shares of common stock on August 17, 2026 at $135.21 per share, in an open-market or private sale reported on Form 4.

How many DORM shares did Donna M. Long retain after the reported sale?

After the transaction, Donna M. Long directly holds 19,338.8738 shares of Dorman Products common stock. This figure represents her reported direct ownership position following the 734-share sale on August 17, 2026.

Was the DORM insider sale by Donna M. Long under a Rule 10b5-1 plan?

Yes. The filing states the 734-share sale was executed under a Rule 10b5-1 trading arrangement adopted by Donna M. Long on August 20, 2025, indicating the trades were pre-arranged under that plan.

What was the sale price in the recent DORM insider transaction?

The reported sale price was $135.21 per share for the 734 shares of Dorman Products common stock sold by Donna M. Long on August 17, 2026, in an open-market or private transaction.

What role does Donna M. Long hold at Dorman Products (DORM)?

Donna M. Long is identified as Senior Vice President, Chief Information Officer (SVP, CIO) of Dorman Products, Inc. She reported the 734-share sale of common stock on August 17, 2026 on Form 4.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 08/18/2026 - 04:11 PM Accepted by SEC EDGAR 08/18/2026 - 04:10 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 PENNSYLVANIA 18915

(City) (State) (Zip)

UNITED STATES

(Country)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/17/2026

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

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

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

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	08/17/2026		S		734(1)	D	$135.21	19,338.8738	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.

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	08/18/2026
	** 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.
* Form 4: SEC 1474 (03-26)