WESTFIELD CAPITAL MANAGEMENT CO LP

Position in FIX — Comfort Systems USA Inc

CIK 1177719 BOSTON, MA

Position in FIX

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

Position Value

$704,450,434

-$151,785,141 QoQ

Shares Held

355,433

-42.8% QoQ

Ownership

1.01%

of shares outstanding

% of Portfolio

2.31%

of 13F equity value

Holder Rank

#14

of 1,343 holders

Holding Since

Dec 2023

11 quarters on record

Voting authority Sole 81% Shared 0% None 19%

Industrials · as of Jun 30, 2026

WESTFIELD CAPITAL MANAGEMENT CO LP holds $1,655,511,536 across 8 Engineering & Construction names. FIX ranks #1 (42.6% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	FIX	Comfort Systems USA Inc This page	355,433	$704,450,434
2	APG	APi Group Corp	6,154,301	$260,634,647
3	PWR	Quanta Services, Inc.	331,489	$238,685,339
4	MTZ	Mastec Inc	374,457	$155,796,579
5	LGN	Legence Corp.	1,341,963	$114,375,506
6	PRIM	Primoris Services Corp	737,493	$73,100,306
7	DY	Dycom Industries Inc	141,978	$71,782,657
8	ECG	Everus Construction Group, Inc.	221,067	$36,686,068

11 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$704,450,434	355,433	-42.8%	Shares	Sole	2026-08-12
2026-03-31	$856,235,575	620,915	-7.2%	Shares	Sole	2026-05-11
2025-12-31	$624,217,017	668,835	-19.7%	Shares	Sole	2026-02-11
2025-09-30	$687,535,850	833,195	-11.0%	Shares	Sole	2025-11-12
2025-06-30	$502,113,478	936,412	+5.3%	Shares	Sole	2025-08-12
2025-03-31	$286,757,338	889,639	+0.5%	Shares	Sole	2025-05-09
2024-12-31	$375,346,955	885,127	+25.0%	Shares	Sole	2025-02-11
2024-09-30	$276,438,063	708,180	-18.1%	Shares	Sole	2024-11-12
2024-06-30	$263,023,960	864,869	+29.7%	Shares	Sole	2024-08-14
2024-03-31	$211,924,007	667,036	+56.4%	Shares	Sole	2024-05-10
2023-12-31	$87,732,651	426,570	—	Shares	Sole	2024-02-09
No filing history on record for this holder in this stock.