Barclays
SION

Barclays’s Sionna Therapeutics SION Stock Holding History

Barclays’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 		$737K Sell
18,385
-29,787
-62% -$1.14M ﹤0.01% 2942
2025
Q4 		$1.98M Buy
48,172
+30,529
+173% +$1.16M ﹤0.01% 2936
2025
Q3 		$519K Sell
17,643
-5,379
-23% -$117K ﹤0.01% 3792
2025
Q2 		$399K Buy
+23,022
New +$302K ﹤0.01% 3890

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

Barclays's SION Position: Q1 2026 in Review

Barclays reduced its Sionna Therapeutics (SION) stake by 62% in Q1 2026, selling an estimated $1.14M and leaving 18,385 shares worth $737K. The position accounts for ﹤0.01% of the portfolio, ranked #2942.

Barclays first reported a position in SION in Q2 2025 and has held it in 4 quarters since. The position peaked at $1.98M in Q4 2025. 122 funds tracked by Wall St. Rank hold SION as of Q1 2026.

  • Barclays held 18,385 shares of Sionna Therapeutics worth $737K as of Q1 2026.
  • Barclays sold 29,787 Sionna Therapeutics shares in Q1 2026, an estimated $1.14M.
  • Sionna Therapeutics made up ﹤0.01% of Barclays's portfolio in Q1 2026, its #2942 holding.
  • Barclays first reported a position in Sionna Therapeutics in Q2 2025 and has held it in 4 quarters since.
  • Barclays's Sionna Therapeutics position peaked at $1.98M in Q4 2025.
  • 122 funds tracked by Wall St. Rank held Sionna Therapeutics as of Q1 2026.

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