Citigroup
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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
Q3 		$705K Buy
133,964
+23,801
+22% +$547K ﹤0.01% 3556
2026
Q2 		$4.85M Buy
110,163
+92,105
+510% +$3.68M ﹤0.01% 2166
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

Y-Intercept (HK)
Y-Intercept (HK) Hong Kong $4.52B AUM 6.6% 1-Year Est. Return
Caitong International Asset Management
Caitong International Asset Management Hong Kong $1.04B AUM 150.25% 1-Year Est. Return
ALPS Advisors
ALPS Advisors Denver, Colorado $21.8B AUM 17.58% 1-Year Est. Return
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $551B AUM 33.95% 1-Year Est. Return
Creative Planning
Creative Planning Overland Park, Kansas $179B AUM 16.96% 1-Year Est. Return
State of Alaska Department of Revenue
State of Alaska Department of Revenue Juneau, Alaska $9.6B AUM 34.67% 1-Year Est. Return
Simplex Trading
Simplex Trading Chicago, Illinois $184B AUM 51.71% 1-Year Est. Return
Principal Financial Group
Principal Financial Group Des Moines, Iowa $195B AUM 21.17% 1-Year Est. Return
China Universal Asset Management Company
China Universal Asset Management Company Shanghai, China $1.92B AUM 74.14% 1-Year Est. Return
Chicago Partners Investment Group
Chicago Partners Investment Group Chicago, Illinois $5.45B AUM 19.52% 1-Year Est. Return

Citigroup's SION Position: Q3 2026 in Review

Citigroup increased its Sionna Therapeutics (SION) stake by 22% in Q3 2026, buying an estimated $547K and bringing the position to 133,964 shares worth $705K. The position accounts for ﹤0.01% of the portfolio, ranked #3556.

Citigroup first reported a position in SION in Q2 2025 and has held it in 6 quarters since. The position peaked at $4.85M in Q2 2026. 34 funds tracked by Wall St. Rank hold SION as of Q3 2026.

  • Citigroup held 133,964 shares of Sionna Therapeutics worth $705K as of Q3 2026.
  • Citigroup bought 23,801 Sionna Therapeutics shares in Q3 2026, an estimated $547K.
  • Sionna Therapeutics made up ﹤0.01% of Citigroup's portfolio in Q3 2026, its #3556 holding.
  • Citigroup first reported a position in Sionna Therapeutics in Q2 2025 and has held it in 6 quarters since.
  • Citigroup's Sionna Therapeutics position peaked at $4.85M in Q2 2026.
  • 34 funds tracked by Wall St. Rank held Sionna Therapeutics as of Q3 2026.

Based on Citigroup's 13F filing for Q3 2026, filed 4 Nov 2026.