Magnetar Financial’s SiriusXM SIRI Stock Holding History

Magnetar Financial’s Portfolio SIRI Stock Details SIRI Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2026 Q1	$1.27M	Buy	+55,062	New	+$1.18M	0.01%	419
2018 Q4	–	Sell	-8,408	Closed	-$531K	–	477
2018 Q3	$531K	Sell	8,408 -1,853	-18%	-$129K	0.01%	188
2018 Q2	$695K	Buy	10,261 +4,289	+72%	+$290K	0.01%	208
2018 Q1	$373K	Sell	5,972 -32,296	-84%	-$1.94M	0.01%	398
2017 Q4	$2.05M	Buy	38,268 +24,806	+184%	+$1.37M	0.04%	114
2017 Q3	$743K	Buy	13,462 +12,309	+1,068%	+$681K	0.01%	347
2017 Q2	$63K	Sell	1,153 -30,943	-96%	-$1.58M	﹤0.01%	768
2017 Q1	$1.65M	Buy	+32,096	New	+$1.58M	0.02%	217
2016 Q1	–	Sell	-4,175	Closed	-$170K	–	449
2015 Q4	$170K	Buy	+4,175	New	+$169K	﹤0.01%	338
2014 Q2	–	Sell	-1,982,518	Closed	-$63.4M	–	230
2014 Q1	$63.4M	Buy	+1,982,518	New	+$70.1M	1.26%	23

Other funds holding SIRI

Berkshire Hathaway Omaha, Nebraska $263B AUM 16.68% 1-Year Est. Return

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

VPM

Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM

VCM

Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM

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

KCMH

Kontiki Capital Management (HK) Hong Kong $1.43B AUM 9.81% 1-Year Est. Return

Goldman Sachs New York $871B AUM 31.28% 1-Year Est. Return

Canada Pension Plan Investment Board Toronto Ontario, Ontario, Canada $155B AUM 29.93% 1-Year Est. Return

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

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

Magnetar Financial's SIRI Position: Q1 2026 in Review

Magnetar Financial opened a new position in SiriusXM (SIRI) in Q1 2026: 55,062 shares worth $1.27M. The stake represents 0.01% of the portfolio and ranks #419 among its holdings. This is a return to the name: Magnetar Financial previously reported a position in SIRI as recently as Q3 2018.

Magnetar Financial first reported a position in SIRI in Q1 2014 and has held it in 10 quarters since. The position peaked at $63.4M in Q1 2014. 559 funds tracked by Wall St. Rank hold SIRI as of Q1 2026.

Magnetar Financial held 55,062 shares of SiriusXM worth $1.27M as of Q1 2026.
SiriusXM was a new Magnetar Financial position in Q1 2026.
SiriusXM made up 0.01% of Magnetar Financial's portfolio in Q1 2026, its #419 holding.
Magnetar Financial first reported a position in SiriusXM in Q1 2014 and has held it in 10 quarters since.
Magnetar Financial's SiriusXM position peaked at $63.4M in Q1 2014.
559 funds tracked by Wall St. Rank held SiriusXM as of Q1 2026.

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