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
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 $9.44B AUM 157.3% 1-Year Est. Return
TGA
TPG GP A Fort Worth, Texas $3.68B AUM 14.99% 1-Year Est. Return
O
OrbiMed New York $5.05B AUM 125.28% 1-Year Est. Return
Viking Global Investors
Viking Global Investors Stamford, Connecticut $35.7B AUM 21.3% 1-Year Est. Return
AVLSA
Atlas Venture Life Science Advisors Cambridge, Massachusetts $790M AUM 223.66% 1-Year Est. Return
ES
Enavate Sciences Menlo Park, California $352M AUM 220.14% 1-Year Est. Return
Jennison Associates
Jennison Associates New York $145B AUM 34.61% 1-Year Est. Return
JP Morgan Chase
JP Morgan Chase New York $1.56T AUM 27.86% 1-Year Est. Return
BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
Citadel Advisors
Citadel Advisors Miami, Florida $618B AUM 30.34% 1-Year Est. Return

Fidelity Investments's SION Position: Q1 2026 in Review

Fidelity Investments increased its Sionna Therapeutics (SION) stake by 21,097% in Q1 2026, buying an estimated $3.09M and bringing the position to 81,395 shares worth $3.26M. The position accounts for ﹤0.01% of the portfolio, ranked #2456.

Fidelity Investments first reported a position in SION in Q3 2025 and has held it in 3 quarters since. 122 funds tracked by Wall St. Rank hold SION as of Q1 2026.

  • Fidelity Investments held 81,395 shares of Sionna Therapeutics worth $3.26M as of Q1 2026.
  • Fidelity Investments bought 81,011 Sionna Therapeutics shares in Q1 2026, an estimated $3.09M.
  • Sionna Therapeutics made up ﹤0.01% of Fidelity Investments's portfolio in Q1 2026, its #2456 holding.
  • Fidelity Investments first reported a position in Sionna Therapeutics in Q3 2025 and has held it in 3 quarters since.
  • 122 funds tracked by Wall St. Rank held Sionna Therapeutics as of Q1 2026.

Based on Fidelity Investments's 13F filing for Q1 2026, filed 15 May 2026.