Citigroup
SION

Citigroup’s Sionna Therapeutics SION Stock Holding History

Citigroup’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 		$724K Buy
18,058
+12,873
+248% +$491K ﹤0.01% 3318
2025
Q4 		$213K Buy
5,185
+4,498
+655% +$171K ﹤0.01% 3979
2025
Q3 		$20.2K Sell
687
-3,693
-84% -$80.3K ﹤0.01% 4810
2025
Q2 		$76K Buy
+4,380
New +$57.4K ﹤0.01% 4556

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

Citigroup's SION Position: Q1 2026 in Review

Citigroup increased its Sionna Therapeutics (SION) stake by 248% in Q1 2026, buying an estimated $491K and bringing the position to 18,058 shares worth $724K. The position accounts for ﹤0.01% of the portfolio, ranked #3318.

Citigroup first reported a position in SION in Q2 2025 and has held it in 4 quarters since. 122 funds tracked by Wall St. Rank hold SION as of Q1 2026.

  • Citigroup held 18,058 shares of Sionna Therapeutics worth $724K as of Q1 2026.
  • Citigroup bought 12,873 Sionna Therapeutics shares in Q1 2026, an estimated $491K.
  • Sionna Therapeutics made up ﹤0.01% of Citigroup's portfolio in Q1 2026, its #3318 holding.
  • Citigroup first reported a position in Sionna Therapeutics in Q2 2025 and has held it in 4 quarters since.
  • 122 funds tracked by Wall St. Rank held Sionna Therapeutics as of Q1 2026.

Based on Citigroup's 13F filing for Q1 2026, filed 11 May 2026.