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Castle Hook Partners’s Ionis Pharmaceuticals IONS Stock Holding History

Castle Hook Partners’s Portfolio IONS Stock Details IONS Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2025
Q2 		– Sell
-23,940
Closed -$722K – 76
2025
Q1 		$722K Hold
23,940
– – 0.01% 37
2024
Q4 		$837K Hold
23,940
– – 0.01% 44
2024
Q3 		$959K Buy
+23,940
New +$1.11M 0.02% 39

Other funds holding IONS

Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return
Vanguard Group
Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return
T. Rowe Price Investment Management
T. Rowe Price Investment Management Baltimore, Maryland $153B AUM 38.14% 1-Year Est. Return
Capital World Investors
Capital World Investors Los Angeles, California $846B AUM 46.74% 1-Year Est. Return
BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
BG
Bellevue Group Kuesnacht, Switzerland $4.75B AUM 68.58% 1-Year Est. Return
Wellington Management Group
Wellington Management Group Boston, Massachusetts $580B AUM 38.23% 1-Year Est. Return
DTC
Deep Track Capital Greenwich, Connecticut $6.87B AUM 205.24% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
Adage Capital Partners
Adage Capital Partners Boston, Massachusetts $71.3B AUM 56.8% 1-Year Est. Return

Castle Hook Partners's IONS Position: Q2 2025 in Review

Castle Hook Partners sold out of Ionis Pharmaceuticals (IONS) in Q2 2025, closing a stake of 23,940 shares — an estimated $722K sold.

Castle Hook Partners first reported a position in IONS in Q3 2024 and held it in 3 quarters. The position peaked at $959K in Q3 2024. 362 funds tracked by Wall St. Rank hold IONS as of Q2 2025.

  • Castle Hook Partners reported no remaining Ionis Pharmaceuticals position as of Q2 2025 after selling out during the quarter.
  • Castle Hook Partners sold 23,940 Ionis Pharmaceuticals shares in Q2 2025, an estimated $722K.
  • Castle Hook Partners first reported a position in Ionis Pharmaceuticals in Q3 2024 and held it in 3 quarters.
  • Castle Hook Partners's Ionis Pharmaceuticals position peaked at $959K in Q3 2024.
  • 362 funds tracked by Wall St. Rank held Ionis Pharmaceuticals as of Q2 2025.

Based on Castle Hook Partners's 13F filing for Q2 2025, filed 14 Aug 2025.