Rossby Financial
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Rossby Financial’s Ionis Pharmaceuticals IONS Stock Holding History

Rossby Financial’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
Q3 		$3.93K Buy
88
+14
+19% +$796 ﹤0.01% 1828
2026
Q2 		$5.87K Hold
74
– – ﹤0.01% 1375
2026
Q1 		$5.56K Buy
74
+25
+51% +$1.97K ﹤0.01% 1465
2025
Q4 		$3.88K Buy
49
+15
+44% +$1.13K ﹤0.01% 1184
2025
Q3 		$2.24K Hold
34
– – ﹤0.01% 1127
2025
Q2 		$1.34K Buy
+34
New +$1.11K ﹤0.01% 1102

Other funds holding IONS

Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.92T AUM 36.1% 1-Year Est. Return
Pictet Asset Management
Pictet Asset Management Carouge, Switzerland $106B AUM 32.76% 1-Year Est. Return
Tweedy, Browne Co
Tweedy, Browne Co Stamford, Connecticut $1.23B AUM 16.54% 1-Year Est. Return
Candriam SCA
Candriam SCA Strassen, Luxembourg, Luxembourg $22.5B AUM 50.38% 1-Year Est. Return
Barclays
Barclays London, United Kingdom $500B AUM 36.84% 1-Year Est. Return
Deutsche Bank
Deutsche Bank Frankfurt Am Main Ge, Germany $362B AUM 34.89% 1-Year Est. Return
Bank of New York Mellon
Bank of New York Mellon New York $608B AUM 32.77% 1-Year Est. Return
Pinnacle Associates
Pinnacle Associates New York $8.92B AUM 43.91% 1-Year Est. Return
C WorldWide Group
C WorldWide Group Copenhagen, Denmark $3.96B AUM 10.41% 1-Year Est. Return
Privium Fund Management
Privium Fund Management Amsterdam, Netherlands $516M AUM 18.66% 1-Year Est. Return

Rossby Financial's IONS Position: Q3 2026 in Review

Rossby Financial increased its Ionis Pharmaceuticals (IONS) stake by 19% in Q3 2026, buying an estimated $796 and bringing the position to 88 shares worth $3.93K. The position accounts for ﹤0.01% of the portfolio, ranked #1828.

Rossby Financial first reported a position in IONS in Q2 2025 and has held it in 6 quarters since. The position peaked at $5.87K in Q2 2026. 178 funds tracked by Wall St. Rank hold IONS as of Q3 2026.

  • Rossby Financial held 88 shares of Ionis Pharmaceuticals worth $3.93K as of Q3 2026.
  • Rossby Financial bought 14 Ionis Pharmaceuticals shares in Q3 2026, an estimated $796.
  • Ionis Pharmaceuticals made up ﹤0.01% of Rossby Financial's portfolio in Q3 2026, its #1828 holding.
  • Rossby Financial first reported a position in Ionis Pharmaceuticals in Q2 2025 and has held it in 6 quarters since.
  • Rossby Financial's Ionis Pharmaceuticals position peaked at $5.87K in Q2 2026.
  • 178 funds tracked by Wall St. Rank held Ionis Pharmaceuticals as of Q3 2026.

Based on Rossby Financial's 13F filing for Q3 2026, filed 5 Nov 2026.