Magnetar Financial’s Summit Materials, Inc. Class A Common Stock SUM Stock Holding History

Magnetar Financial’s Portfolio SUM Stock Details SUM Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2025 Q1	–	Sell	-1,563,121	Closed	-$79.1M	–	1006
2024 Q4	$79.1M	Buy	+1,563,121	New	+$73M	1.82%	6
2024 Q3	–	Sell	-35,063	Closed	-$1.28M	–	736
2024 Q2	$1.28M	Buy	+35,063	New	+$1.38M	0.03%	238
2023 Q4	–	Sell	-9,626	Closed	-$300K	–	571
2023 Q3	$300K	Buy	+9,626	New	+$343K	0.01%	373
2018 Q2	–	Sell	-29,528	Closed	-$879K	–	718
2018 Q1	$879K	Buy	29,528 +15,916	+117%	+$491K	0.02%	229
2017 Q4	$421K	Buy	+13,612	New	+$410K	0.01%	434
2015 Q2	–	Sell	-105,927	Closed	-$2.21M	–	471
2015 Q1	$2.21M	Buy	+105,927	New	+$2.15M	0.04%	154

Other funds holding SUM

SFCL

Strengthening Families & Communities LLC Boston, Massachusetts $401M AUM 33.17% 1-Year Est. Return

Principal Securities Des Moines, Iowa $6.82B AUM 17.15% 1-Year Est. Return

DekaBank Deutsche Girozentrale Frankfurt, Germany $60.6B AUM 23.27% 1-Year Est. Return

WAM

WFA Asset Management Whitefish Bay, Wisconsin $184M AUM 12.29% 1-Year Est. Return

IFP Advisors Tampa, Florida $5.54B AUM 27.43% 1-Year Est. Return

HNB

Huntington National Bank Columbus, Ohio $18.1B AUM 24.69% 1-Year Est. Return

Magnetar Financial's SUM Position: Q1 2025 in Review

Magnetar Financial sold out of Summit Materials, Inc. Class A Common Stock (SUM) in Q1 2025, closing a stake of 1,563,121 shares — an estimated $79.1M sold.

Magnetar Financial first reported a position in SUM in Q1 2015 and held it in 6 quarters. The position peaked at $79.1M in Q4 2024. 7 funds tracked by Wall St. Rank hold SUM as of Q1 2025.

Magnetar Financial reported no remaining Summit Materials, Inc. Class A Common Stock position as of Q1 2025 after selling out during the quarter.
Magnetar Financial sold 1,563,121 Summit Materials, Inc. Class A Common Stock shares in Q1 2025, an estimated $79.1M.
Magnetar Financial first reported a position in Summit Materials, Inc. Class A Common Stock in Q1 2015 and held it in 6 quarters.
Magnetar Financial's Summit Materials, Inc. Class A Common Stock position peaked at $79.1M in Q4 2024.
7 funds tracked by Wall St. Rank held Summit Materials, Inc. Class A Common Stock as of Q1 2025.

Based on Magnetar Financial's 13F filing for Q1 2025, filed 15 May 2025.