Fidelity Investments
SION

Fidelity Investments’s Sionna Therapeutics SION Stock Holding History

Fidelity Investments’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 		$12.2M Buy
278,292
+196,897
+242% +$7.88M ﹤0.01% 2051
2026
Q1 		$3.26M Buy
81,395
+81,011
+21,097% +$3.09M ﹤0.01% 2456
2025
Q4 		$15.8K Buy
384
+150
+64% +$5.69K ﹤0.01% 4569
2025
Q3 		$6.88K Buy
+234
New +$5.09K ﹤0.01% 4704

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

Fidelity Investments's SION Position: Q2 2026 in Review

Fidelity Investments increased its Sionna Therapeutics (SION) stake by 242% in Q2 2026, buying an estimated $7.88M and bringing the position to 278,292 shares worth $12.2M. The position accounts for ﹤0.01% of the portfolio, ranked #2051.

Fidelity Investments first reported a position in SION in Q3 2025 and has held it in 4 quarters since. 147 funds tracked by Wall St. Rank hold SION as of Q2 2026.

  • Fidelity Investments held 278,292 shares of Sionna Therapeutics worth $12.2M as of Q2 2026.
  • Fidelity Investments bought 196,897 Sionna Therapeutics shares in Q2 2026, an estimated $7.88M.
  • Sionna Therapeutics made up ﹤0.01% of Fidelity Investments's portfolio in Q2 2026, its #2051 holding.
  • Fidelity Investments first reported a position in Sionna Therapeutics in Q3 2025 and has held it in 4 quarters since.
  • 147 funds tracked by Wall St. Rank held Sionna Therapeutics as of Q2 2026.

Based on Fidelity Investments's 13F filing for Q2 2026, filed 13 Aug 2026.