WESTFIELD CAPITAL MANAGEMENT CO LP

Position in BLDR — Builders FirstSource, Inc.

CIK 1177719 BOSTON, MA

Position in BLDR

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

Position Value

$58,736,551

+$9,792,087 QoQ

Shares Held

656,421

+38.0% QoQ

Ownership

0.610%

of shares outstanding

% of Portfolio

0.19%

of 13F equity value

Holder Rank

#38

of 666 holders

Holding Since

Mar 2023

9 quarters on record

Voting authority Sole 95% Shared 0% None 5%

Industrials · as of Jun 30, 2026

WESTFIELD CAPITAL MANAGEMENT CO LP holds $102,664,618 across 3 Building Products & Equipment names. BLDR ranks #1 (57.2% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	BLDR	Builders FirstSource, Inc. This page	656,421	$58,736,551
2	SPXC	SPX Technologies, Inc.	147,481	$36,157,916
3	TT	Trane Technologies plc	15,820	$7,770,151

9 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$58,736,551	656,421	+38.0%	Shares	Sole	2026-08-12
2025-12-31	$48,944,464	475,697	-22.8%	Shares	Sole	2026-02-11
2025-09-30	$74,693,880	616,032	+7678.2%	Shares	Sole	2025-11-12
2024-06-30	$1,096,207	7,920	-99.4%	Shares	Sole	2024-08-14
2024-03-31	$288,066,778	1,381,284	-2.5%	Shares	Sole	2024-05-10
2023-12-31	$236,489,040	1,416,611	+11.2%	Shares	Sole	2024-02-09
2023-09-30	$158,546,729	1,273,570	-22.5%	Shares	Sole	2023-11-13
2023-06-30	$223,446,096	1,642,986	+124.7%	Shares	Sole	2023-08-11
2023-03-31	$64,912,207	731,158	—	Shares	Sole	2023-05-12
No filing history on record for this holder in this stock.