PEAK6’s Builders FirstSource BLDR Stock Holding History

PEAK6’s Portfolio BLDR Stock Details BLDR Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2026 Q1	$32.9K	Sell	400 -32,900	-99%	-$3.51M	﹤0.01%	2490
2025 Q4	$3.43M	Buy	33,300 +22,400	+206%	+$2.52M	0.01%	1138
2025 Q3	$1.32M	Sell	10,900 -67,900	-86%	-$9.01M	﹤0.01%	1718
2025 Q2	$9.2M	Sell	78,800 -32,300	-29%	-$3.73M	0.02%	661
2025 Q1	$13.9M	Buy	111,100 +6,400	+6%	+$931K	0.03%	454
2024 Q4	$15M	Buy	+104,700	New	+$18.5M	0.03%	423

Other funds holding BLDR

BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return

VCM

Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM

State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return

VPM

Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM

Wellington Management Group Boston, Massachusetts $535B AUM 26.23% 1-Year Est. Return

Dimensional Fund Advisors Austin, Texas $481B AUM 30.42% 1-Year Est. Return

Capital International Investors Los Angeles, California $427B AUM 29.17% 1-Year Est. Return

Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return

Sands Capital Management Arlington, Virginia $25.5B AUM 26.46% 1-Year Est. Return

Invesco Atlanta, Georgia $1.02T AUM 30.18% 1-Year Est. Return

PEAK6's BLDR Position: Q1 2026 in Review

PEAK6 reduced its Builders FirstSource (BLDR) stake by 67% in Q1 2026, selling an estimated $830K and leaving 3,779 shares worth $311K. The position accounts for ﹤0.01% of the portfolio, ranked #2142.

PEAK6 first reported a position in BLDR in Q4 2024 and has held it in 6 quarters since. The position peaked at $12.3M in Q4 2024. 719 funds tracked by Wall St. Rank hold BLDR as of Q1 2026.

PEAK6 held 3,779 shares of Builders FirstSource worth $311K as of Q1 2026.
PEAK6 sold 7,775 Builders FirstSource shares in Q1 2026, an estimated $830K.
Builders FirstSource made up ﹤0.01% of PEAK6's portfolio in Q1 2026, its #2142 holding.
PEAK6 first reported a position in Builders FirstSource in Q4 2024 and has held it in 6 quarters since.
PEAK6's Builders FirstSource position peaked at $12.3M in Q4 2024.
719 funds tracked by Wall St. Rank held Builders FirstSource as of Q1 2026.

Based on PEAK6's 13F filing for Q1 2026, filed 14 May 2026.