WESTFIELD CAPITAL MANAGEMENT CO LP

Position in DORM — Dorman Products, Inc.

CIK 1177719 BOSTON, MA

Position in DORM

as of Jun 30, 2026 · filed Aug 12, 2026 Compact

Position Value

$45,138,888

-$3,000,501 QoQ

Shares Held

330,809

-28.3% QoQ

Ownership

1.11%

of shares outstanding

% of Portfolio

0.15%

of 13F equity value

Holder Rank

#24

of 328 holders

Holding Since

Dec 2025

3 quarters on record

Voting authority Sole 95% Shared 0% None 5%

Consumer Cyclical · as of Jun 30, 2026

WESTFIELD CAPITAL MANAGEMENT CO LP holds $205,851,353 across 3 Auto Parts names. DORM ranks #3 (21.9% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	ORLY	O Reilly Automotive Inc	933,255	$85,943,452
2	AZO	Autozone Inc	23,395	$74,769,013
3	DORM	Dorman Products, Inc. This page	330,809	$45,138,888

3 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$45,138,888	330,809	-28.3%	Shares	Sole	2026-08-12
2026-03-31	$48,139,389	461,282	-0.2%	Shares	Sole	2026-05-11
2025-12-31	$56,939,896	462,212	—	Shares	Sole	2026-02-11
No filing history on record for this holder in this stock.