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EcoR1 Capital’s Ionis Pharmaceuticals IONS Stock Holding History

EcoR1 Capital’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
2024
Q4 		– Sell
-500,000
Closed -$20M – 65
2024
Q3 		$20M Buy
+500,000
New +$23.3M 0.69% 33
2020
Q2 		– Sell
-208,609
Closed -$9.86M – 58
2020
Q1 		$9.86M Buy
+208,609
New +$11.6M 1.03% 26
2019
Q1 		– Sell
-725,326
Closed -$39.2M – 49
2018
Q4 		$39.2M Buy
725,326
+653,000
+903% +$33.3M 3.92% 8
2018
Q3 		$3.73M Buy
+72,326
New +$3.4M 0.34% 38

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
BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Capital World Investors
Capital World Investors Los Angeles, California $846B AUM 46.74% 1-Year Est. Return
Wellington Management Group
Wellington Management Group Boston, Massachusetts $580B AUM 38.23% 1-Year Est. Return
BG
Bellevue Group Kuesnacht, Switzerland $4.75B AUM 68.58% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
T. Rowe Price Associates
T. Rowe Price Associates Baltimore, Maryland $999B AUM 46.22% 1-Year Est. Return
TBC
Tweedy, Browne Co Stamford, Connecticut $1.32B AUM 32.9% 1-Year Est. Return

EcoR1 Capital's IONS Position: Q4 2024 in Review

EcoR1 Capital sold out of Ionis Pharmaceuticals (IONS) in Q4 2024, closing a stake of 500,000 shares — an estimated $20M sold.

EcoR1 Capital first reported a position in IONS in Q3 2018 and held it in 4 quarters. The position peaked at $39.2M in Q4 2018. 355 funds tracked by Wall St. Rank hold IONS as of Q4 2024.

  • EcoR1 Capital reported no remaining Ionis Pharmaceuticals position as of Q4 2024 after selling out during the quarter.
  • EcoR1 Capital sold 500,000 Ionis Pharmaceuticals shares in Q4 2024, an estimated $20M.
  • EcoR1 Capital first reported a position in Ionis Pharmaceuticals in Q3 2018 and held it in 4 quarters.
  • EcoR1 Capital's Ionis Pharmaceuticals position peaked at $39.2M in Q4 2018.
  • 355 funds tracked by Wall St. Rank held Ionis Pharmaceuticals as of Q4 2024.

Based on EcoR1 Capital's 13F filing for Q4 2024, filed 14 Feb 2025.