Westfield Capital Management
IONS icon

Westfield Capital Management’s Ionis Pharmaceuticals IONS Stock Holding History

Westfield Capital 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 		$336K Buy
4,233
+731
+21% +$55K ﹤0.01% 274
2026
Q1 		$263K Buy
3,502
+345
+11% +$27.2K ﹤0.01% 244
2025
Q4 		$250K Buy
3,157
+64
+2% +$4.82K ﹤0.01% 238
2025
Q3 		$202K Sell
3,093
-6,468
-68% -$316K ﹤0.01% 235
2025
Q2 		$378K Buy
+9,561
New +$313K ﹤0.01% 237

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

Westfield Capital Management's IONS Position: Q2 2026 in Review

Westfield Capital Management increased its Ionis Pharmaceuticals (IONS) stake by 21% in Q2 2026, buying an estimated $55K and bringing the position to 4,233 shares worth $336K. The position accounts for ﹤0.01% of the portfolio, ranked #274.

Westfield Capital Management first reported a position in IONS in Q2 2025 and has held it in 5 quarters since. The position peaked at $378K in Q2 2025. 513 funds tracked by Wall St. Rank hold IONS as of Q2 2026.

  • Westfield Capital Management held 4,233 shares of Ionis Pharmaceuticals worth $336K as of Q2 2026.
  • Westfield Capital Management bought 731 Ionis Pharmaceuticals shares in Q2 2026, an estimated $55K.
  • Ionis Pharmaceuticals made up ﹤0.01% of Westfield Capital Management's portfolio in Q2 2026, its #274 holding.
  • Westfield Capital Management first reported a position in Ionis Pharmaceuticals in Q2 2025 and has held it in 5 quarters since.
  • Westfield Capital Management's Ionis Pharmaceuticals position peaked at $378K in Q2 2025.
  • 513 funds tracked by Wall St. Rank held Ionis Pharmaceuticals as of Q2 2026.

Based on Westfield Capital Management's 13F filing for Q2 2026, filed 12 Aug 2026.