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 Q2	–	Sell	-24,019	Closed	-$1.89M	–	1187
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 $6.73T AUM 46.02% 1-Year Est. Return

Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM

State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return

Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM

Capital International Investors Los Angeles, California $484B AUM 34.9% 1-Year Est. Return

Pictet Asset Management Carouge, Switzerland $105B AUM 38.07% 1-Year Est. Return

Wellington Management Group Boston, Massachusetts $580B AUM 38.23% 1-Year Est. Return

Dimensional Fund Advisors Austin, Texas $552B AUM 44.19% 1-Year Est. Return

Invesco Atlanta, Georgia $1.26T AUM 61.52% 1-Year Est. Return

Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return

Magnetar Financial's BLDR Position: Q2 2026 in Review

Magnetar Financial sold out of Builders FirstSource (BLDR) in Q2 2026, closing a stake of 24,019 shares — an estimated $1.89M sold.

Magnetar Financial first reported a position in BLDR in Q1 2018 and held it in 9 quarters. The position peaked at $5.64M in Q4 2024. 671 funds tracked by Wall St. Rank hold BLDR as of Q2 2026.

Magnetar Financial reported no remaining Builders FirstSource position as of Q2 2026 after selling out during the quarter.
Magnetar Financial sold 24,019 Builders FirstSource shares in Q2 2026, an estimated $1.89M.
Magnetar Financial first reported a position in Builders FirstSource in Q1 2018 and held it in 9 quarters.
Magnetar Financial's Builders FirstSource position peaked at $5.64M in Q4 2024.
671 funds tracked by Wall St. Rank held Builders FirstSource as of Q2 2026.

Based on Magnetar Financial's 13F filing for Q2 2026, filed 14 Aug 2026.