Magnetar Financial’s Builders FirstSource BLDR Stock Holding History

Magnetar Financial’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	$1.89M	Buy	24,019 +12,367	+106%	+$1.32M	0.02%	331
2025 Q4	$1.2M	Buy	+11,652	New	+$1.31M	0.01%	416
2025 Q1	–	Sell	-39,485	Closed	-$5.64M	–	747
2024 Q4	$5.64M	Buy	+39,485	New	+$6.99M	0.13%	118
2024 Q3	–	Sell	-34,260	Closed	-$4.74M	–	539
2024 Q2	$4.74M	Buy	34,260 +28,956	+546%	+$4.92M	0.1%	107
2024 Q1	$1.11M	Buy	+5,304	New	+$980K	0.02%	244
2020 Q4	–	Sell	-6,262	Closed	-$204K	–	732
2020 Q3	$204K	Buy	+6,262	New	+$170K	﹤0.01%	611
2019 Q1	–	Sell	-10,762	Closed	-$117K	–	421
2018 Q4	$117K	Buy	10,762 +100	+0.9%	+$1.26K	﹤0.01%	258
2018 Q3	$157K	Buy	+10,662	New	+$181K	﹤0.01%	481
2018 Q2	–	Sell	-12,801	Closed	-$254K	–	506
2018 Q1	$254K	Buy	+12,801	New	+$271K	﹤0.01%	489

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

Magnetar Financial's BLDR Position: Q1 2026 in Review

Magnetar Financial increased its Builders FirstSource (BLDR) stake by 106% in Q1 2026, buying an estimated $1.32M and bringing the position to 24,019 shares worth $1.89M. The position accounts for 0.02% of the portfolio, ranked #331.

Magnetar Financial first reported a position in BLDR in Q1 2018 and has held it in 9 quarters since. The position peaked at $5.64M in Q4 2024. 719 funds tracked by Wall St. Rank hold BLDR as of Q1 2026.

Magnetar Financial held 24,019 shares of Builders FirstSource worth $1.89M as of Q1 2026.
Magnetar Financial bought 12,367 Builders FirstSource shares in Q1 2026, an estimated $1.32M.
Builders FirstSource made up 0.02% of Magnetar Financial's portfolio in Q1 2026, its #331 holding.
Magnetar Financial first reported a position in Builders FirstSource in Q1 2018 and has held it in 9 quarters since.
Magnetar Financial's Builders FirstSource position peaked at $5.64M in Q4 2024.
719 funds tracked by Wall St. Rank held Builders FirstSource as of Q1 2026.

Based on Magnetar Financial's 13F filing for Q1 2026, filed 13 May 2026.