CastleKnight Management’s SiriusXM SIRI Stock Holding History

CastleKnight Management’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	$7.59M	Sell	256,900 -156,800	-38%	-$4.21M	0.1%	140
2026 Q1	$9.55M	Buy	413,700 +274,700	+198%	+$5.9M	0.16%	83
2025 Q4	$2.78M	Buy	139,000 +87,400	+169%	+$1.88M	0.06%	164
2025 Q3	$1.2M	Buy	+51,600	New	+$1.19M	0.02%	298
2023 Q2	–	Sell	-8,940	Closed	-$355K	–	332
2023 Q1	$355K	Buy	+8,940	New	+$428K	0.04%	211

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

CastleKnight Management's SIRI Position: Q2 2026 in Review

CastleKnight Management reduced its SiriusXM (SIRI) stake by 38% in Q2 2026, selling an estimated $4.21M and leaving 256,900 shares worth $7.59M. The position accounts for 0.1% of the portfolio, ranked #140.

CastleKnight Management first reported a position in SIRI in Q1 2023 and has held it in 5 quarters since. The position peaked at $9.55M in Q1 2026. 601 funds tracked by Wall St. Rank hold SIRI as of Q2 2026.

CastleKnight Management held 256,900 shares of SiriusXM worth $7.59M as of Q2 2026.
CastleKnight Management sold 156,800 SiriusXM shares in Q2 2026, an estimated $4.21M.
SiriusXM made up 0.1% of CastleKnight Management's portfolio in Q2 2026, its #140 holding.
CastleKnight Management first reported a position in SiriusXM in Q1 2023 and has held it in 5 quarters since.
CastleKnight Management's SiriusXM position peaked at $9.55M in Q1 2026.
601 funds tracked by Wall St. Rank held SiriusXM as of Q2 2026.

Based on CastleKnight Management's 13F filing for Q2 2026, filed 14 Aug 2026.