Rafferty Asset Management
SION

Rafferty Asset Management’s Sionna Therapeutics SION Stock Holding History

Rafferty Asset Management’s Portfolio SION Stock Details SION Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q2 		$792K Sell
18,004
-4,133
-19% -$165K ﹤0.01% 827
2026
Q1 		$887K Sell
22,137
-2,553
-10% -$97.4K ﹤0.01% 803
2025
Q4 		$1.02M Buy
+24,690
New +$936K ﹤0.01% 795

Other funds holding SION

RCM
RA Capital Management Boston, Massachusetts $11.5B AUM 168.77% 1-Year Est. Return
TGA
TPG GP A Fort Worth, Texas $5B AUM 58.56% 1-Year Est. Return
Viking Global Investors
Viking Global Investors Stamford, Connecticut $35.1B AUM 21.36% 1-Year Est. Return
AVLSA
Atlas Venture Life Science Advisors Cambridge, Massachusetts $881M AUM 160.77% 1-Year Est. Return
O
OrbiMed New York $5.4B AUM 163.13% 1-Year Est. Return
ES
Enavate Sciences Menlo Park, California $345M AUM 134.64% 1-Year Est. Return
Adage Capital Partners
Adage Capital Partners Boston, Massachusetts $71.3B AUM 56.8% 1-Year Est. Return
BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
JP Morgan Chase
JP Morgan Chase New York $1.81T AUM 41.13% 1-Year Est. Return
Jennison Associates
Jennison Associates New York $167B AUM 44.17% 1-Year Est. Return

Rafferty Asset Management's SION Position: Q2 2026 in Review

Rafferty Asset Management reduced its Sionna Therapeutics (SION) stake by 19% in Q2 2026, selling an estimated $165K and leaving 18,004 shares worth $792K. The position accounts for ﹤0.01% of the portfolio, ranked #827.

Rafferty Asset Management first reported a position in SION in Q4 2025 and has held it in 3 quarters since. The position peaked at $1.02M in Q4 2025. 147 funds tracked by Wall St. Rank hold SION as of Q2 2026.

  • Rafferty Asset Management held 18,004 shares of Sionna Therapeutics worth $792K as of Q2 2026.
  • Rafferty Asset Management sold 4,133 Sionna Therapeutics shares in Q2 2026, an estimated $165K.
  • Sionna Therapeutics made up ﹤0.01% of Rafferty Asset Management's portfolio in Q2 2026, its #827 holding.
  • Rafferty Asset Management first reported a position in Sionna Therapeutics in Q4 2025 and has held it in 3 quarters since.
  • Rafferty Asset Management's Sionna Therapeutics position peaked at $1.02M in Q4 2025.
  • 147 funds tracked by Wall St. Rank held Sionna Therapeutics as of Q2 2026.

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