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Deerfield Management’s Ionis Pharmaceuticals IONS Stock Holding History

Deerfield Management’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
2026
Q2 		$157M Hold
1,979,669
– – 1.64% 15
2026
Q1 		$149M Hold
1,979,669
– – 1.75% 15
2025
Q4 		$157M Hold
1,979,669
– – 2% 13
2025
Q3 		$130M Buy
+1,979,669
New +$96.7M 1.98% 11
2017
Q1 		– Sell
-214,095
Closed -$10.2M – 110
2016
Q4 		$10.2M Buy
+214,095
New +$8.47M 0.42% 60

Other funds holding IONS

Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 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
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
Wellington Management Group
Wellington Management Group Boston, Massachusetts $580B AUM 38.23% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
Two Sigma Investments
Two Sigma Investments New York $138B AUM 41.87% 1-Year Est. Return
Royal Bank of Canada
Royal Bank of Canada Toronto, Ontario, Canada $672B AUM 33.48% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
T. Rowe Price Investment Management
T. Rowe Price Investment Management Baltimore, Maryland $153B AUM 38.14% 1-Year Est. Return

Deerfield Management's IONS Position: Q2 2026 in Review

Deerfield Management held its Ionis Pharmaceuticals (IONS) position steady in Q2 2026 at 1,979,669 shares worth $157M. The position accounts for 1.64% of the portfolio, ranked #15.

Deerfield Management first reported a position in IONS in Q4 2016 and has held it in 5 quarters since. 513 funds tracked by Wall St. Rank hold IONS as of Q2 2026.

  • Deerfield Management held 1,979,669 shares of Ionis Pharmaceuticals worth $157M as of Q2 2026.
  • Deerfield Management left its Ionis Pharmaceuticals share count unchanged in Q2 2026.
  • Ionis Pharmaceuticals made up 1.64% of Deerfield Management's portfolio in Q2 2026, its #15 holding.
  • Deerfield Management first reported a position in Ionis Pharmaceuticals in Q4 2016 and has held it in 5 quarters since.
  • 513 funds tracked by Wall St. Rank held Ionis Pharmaceuticals as of Q2 2026.

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