Citadel Advisors
SION

Citadel Advisors’s Sionna Therapeutics SION Stock Holding History

Citadel Advisors’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 		$50.5M Sell
1,147,636
-19,295
-2% -$772K 0.01% 1555
2026
Q1 		$46.8M Buy
1,166,931
+79,606
+7% +$3.04M 0.01% 1423
2025
Q4 		$44.7M Buy
1,087,325
+1,051,402
+2,927% +$39.9M 0.01% 1526
2025
Q3 		$1.06M Sell
35,923
-93,989
-72% -$2.04M ﹤0.01% 7421
2025
Q2 		$2.25M Sell
129,912
-196,588
-60% -$2.58M ﹤0.01% 5483
2025
Q1 		$3.42M Buy
+326,500
New +$5.33M ﹤0.01% 4540

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

Citadel Advisors's SION Position: Q2 2026 in Review

Citadel Advisors reduced its Sionna Therapeutics (SION) stake by 1.7% in Q2 2026, selling an estimated $772K and leaving 1,147,636 shares worth $50.5M. The position accounts for 0.01% of the portfolio, ranked #1555.

Citadel Advisors first reported a position in SION in Q1 2025 and has held it in 6 quarters since. 146 funds tracked by Wall St. Rank hold SION as of Q2 2026.

  • Citadel Advisors held 1,147,636 shares of Sionna Therapeutics worth $50.5M as of Q2 2026.
  • Citadel Advisors sold 19,295 Sionna Therapeutics shares in Q2 2026, an estimated $772K.
  • Sionna Therapeutics made up 0.01% of Citadel Advisors's portfolio in Q2 2026, its #1555 holding.
  • Citadel Advisors first reported a position in Sionna Therapeutics in Q1 2025 and has held it in 6 quarters since.
  • 146 funds tracked by Wall St. Rank held Sionna Therapeutics as of Q2 2026.

Based on Citadel Advisors's 13F filing for Q2 2026, filed 14 Aug 2026.