Whitebox Advisors’s SiriusXM SIRI Stock Holding History

Whitebox Advisors’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	$2.2M	Sell	74,443 -79,500	-52%	-$2.14M	0.03%	274
2026 Q1	$3.55M	Sell	153,943 -17,000	-10%	-$365K	0.04%	159
2025 Q4	$3.42M	Buy	170,943 +5,000	+3%	+$107K	0.05%	160
2025 Q3	$3.86M	Sell	165,943 -6,000	-3%	-$139K	0.06%	147
2025 Q2	$3.95M	Buy	171,943 +25,916	+18%	+$558K	0.08%	139
2025 Q1	$3.29M	Sell	146,027 -230,708	-61%	-$5.43M	0.08%	141
2024 Q4	$8.59M	Sell	376,735 -799,987	-68%	-$20.4M	0.25%	78
2024 Q3	$27.8M	Buy	1,176,722 +1,148,055	+4,005%	+$35.7M	0.75%	35
2024 Q2	$811K	Buy	+28,667	New	+$856K	0.02%	155
2022 Q1	–	Sell	-5,000	Closed	-$318K	–	964
2021 Q4	$318K	Sell	5,000 -13,500	-73%	-$844K	0.01%	532
2021 Q3	$1.13M	Hold	18,500	–	–	0.02%	244
2021 Q2	$1.21M	Buy	+18,500	New	+$1.16M	0.02%	198

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

Boston Partners Boston, Massachusetts $113B AUM 38.87% 1-Year Est. Return

GCM

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

Whitebox Advisors's SIRI Position: Q2 2026 in Review

Whitebox Advisors reduced its SiriusXM (SIRI) stake by 52% in Q2 2026, selling an estimated $2.14M and leaving 74,443 shares worth $2.2M. The position accounts for 0.03% of the portfolio, ranked #274.

Whitebox Advisors first reported a position in SIRI in Q2 2021 and has held it in 12 quarters since. The position peaked at $27.8M in Q3 2024. 600 funds tracked by Wall St. Rank hold SIRI as of Q2 2026.

Whitebox Advisors held 74,443 shares of SiriusXM worth $2.2M as of Q2 2026.
Whitebox Advisors sold 79,500 SiriusXM shares in Q2 2026, an estimated $2.14M.
SiriusXM made up 0.03% of Whitebox Advisors's portfolio in Q2 2026, its #274 holding.
Whitebox Advisors first reported a position in SiriusXM in Q2 2021 and has held it in 12 quarters since.
Whitebox Advisors's SiriusXM position peaked at $27.8M in Q3 2024.
600 funds tracked by Wall St. Rank held SiriusXM as of Q2 2026.

Based on Whitebox Advisors's 13F filing for Q2 2026, filed 14 Aug 2026.