GROUP ONE TRADING LLC

Position in BLDR — Builders FirstSource, Inc.

CIK 932540 CHICAGO, IL

Position in BLDR

as of Mar 31, 2026 · filed May 13, 2026 Compact

Position Value

$2,022,107

+$413,011 QoQ

Shares Held

24,561

+57.0% QoQ

Ownership

0.023%

of shares outstanding

% of Portfolio

0.08%

of 13F equity value

Holder Rank

—

not a current holder

Holding Since

Jun 2020

10 quarters on record

Voting authority Sole 100.ToString("F0")% Shared 0.ToString("F0")% None 0.ToString("F0")%

Industrials · as of Mar 31, 2026

GROUP ONE TRADING LLC holds $5,231,443 across 11 Building Products & Equipment names. BLDR ranks #2 (38.7% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	CARR	CARRIER GLOBAL Corp	41,801	$2,353,814
2	BLDR	Builders FirstSource, Inc. This page	24,561	$2,022,107
3	APT	Alpha Pro Tech Ltd	113,071	$502,035
4	MAS	Masco Corp /De/	2,524	$152,373
5	TREX	Trex Co Inc	2,395	$87,225
6	LMB	Limbach Holdings, Inc.	673	$52,527
7	LPX	Louisiana-Pacific Corp	404	$29,391
8	NPKI	NPK International Inc.	993	$14,388

10 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$2,022,107	24,561	+57.0%	Shares	Sole	2026-05-13
2025-12-31	$1,609,096	15,639	-30.2%	Shares	Sole	2026-02-12
2025-09-30	$2,716,485	22,404	-7.3%	Shares	Sole	2025-11-12
2025-06-30	$2,820,397	24,170	+154.9%	Shares	Sole	2025-08-14
2023-03-31	$841,900	9,483	+14.7%	Shares	Sole	2023-05-12
2022-09-30	$487,150	8,268	-63.9%	Shares	Sole	2022-11-09
2022-03-31	$1,478,740	22,912	-73.1%	Shares	Sole	2022-05-12
2021-06-30	$3,630,067	85,093	+83.4%	Shares	Sole	2021-08-10
2021-03-31	$2,151,104	46,390	+622.4%	Shares	Sole	2021-05-12
2020-06-30	$132,935	6,422	—	Shares	Sole	2020-08-13
No filing history on record for this holder in this stock.