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John Overdeck’s SiriusXM SIRI Stock Holding History

John Overdeck’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 		$257K Sell
8,700
-22,300
-72% -$599K ﹤0.01% 4624
2026
Q1 		$715K Buy
31,000
+4,000
+15% +$86K ﹤0.01% 3481
2025
Q4 		$540K Buy
+27,000
New +$580K ﹤0.01% 3261

Other funds holding SIRI

Berkshire Hathaway
Berkshire Hathaway Omaha, Nebraska $299B AUM 27.55% 1-Year Est. Return
BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $552B AUM 44.19% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
Vanguard Capital Management
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
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 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

John Overdeck's SIRI Position: Q2 2026 in Review

John Overdeck reduced its SiriusXM (SIRI) stake by 55% in Q2 2026, selling an estimated $26.5M and leaving 791,961 shares worth $23.4M. The position accounts for 0.02% of the portfolio, ranked #956.

John Overdeck first reported a position in SIRI in Q4 2013 and has held it in 33 quarters since. The position peaked at $110M in Q3 2016. 594 funds tracked by Wall St. Rank hold SIRI as of Q2 2026.

  • John Overdeck held 791,961 shares of SiriusXM worth $23.4M as of Q2 2026.
  • John Overdeck sold 985,258 SiriusXM shares in Q2 2026, an estimated $26.5M.
  • SiriusXM made up 0.02% of John Overdeck's portfolio in Q2 2026, its #956 holding.
  • John Overdeck first reported a position in SiriusXM in Q4 2013 and has held it in 33 quarters since.
  • John Overdeck's SiriusXM position peaked at $110M in Q3 2016.
  • 594 funds tracked by Wall St. Rank held SiriusXM as of Q2 2026.

Based on Two Sigma Investments's 13F filing for Q2 2026, filed 14 Aug 2026.