Boston Partners’s SiriusXM SIRI Stock Holding History

Boston Partners’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 Q2	$150M	Buy	+5,080,806	New	+$137M	0.13%	186
2025 Q1	–	Sell	-33,620	Closed	-$767K	–	763
2024 Q4	$767K	Buy	33,620 +8,239	+32%	+$210K	﹤0.01%	593
2024 Q3	$600K	Buy	+25,381	New	+$788K	﹤0.01%	663
2018 Q3	–	Sell	-34,986	Closed	-$2.37M	–	771
2018 Q2	$2.37M	Sell	34,986 -2,512	-7%	-$170K	﹤0.01%	625
2018 Q1	$2.34M	Sell	37,498 -7,804	-17%	-$469K	﹤0.01%	626
2017 Q4	$2.43M	Hold	45,302	–	–	﹤0.01%	648
2017 Q3	$2.5M	Hold	45,302	–	–	﹤0.01%	637
2017 Q2	$2.48M	Buy	+45,302	New	+$2.31M	﹤0.01%	629

Other funds holding SIRI

Berkshire Hathaway Omaha, Nebraska $299B AUM 27.55% 1-Year Est. Return

BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return

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

Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM

Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM

KCMH

Kontiki Capital Management (HK) Hong Kong $1.52B AUM 10.48% 1-Year Est. Return

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

CCM

Check Capital Management Costa Mesa, California $7.52B AUM 15.3% 1-Year Est. Return

GCM

Gates Capital Management New York $4.16B AUM 21% 1-Year Est. Return

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

Boston Partners's SIRI Position: Q2 2026 in Review

Boston Partners opened a new position in SiriusXM (SIRI) in Q2 2026: 5,080,806 shares worth $150M. The stake represents 0.13% of the portfolio and ranks #186 among its holdings. This is a return to the name: Boston Partners previously reported a position in SIRI as recently as Q4 2024.

Boston Partners first reported a position in SIRI in Q2 2017 and has held it in 8 quarters since. 598 funds tracked by Wall St. Rank hold SIRI as of Q2 2026.

Boston Partners held 5,080,806 shares of SiriusXM worth $150M as of Q2 2026.
SiriusXM was a new Boston Partners position in Q2 2026.
SiriusXM made up 0.13% of Boston Partners's portfolio in Q2 2026, its #186 holding.
Boston Partners first reported a position in SiriusXM in Q2 2017 and has held it in 8 quarters since.
598 funds tracked by Wall St. Rank held SiriusXM as of Q2 2026.

Based on Boston Partners's 13F filing for Q2 2026, filed 4 Aug 2026.