AllianceBernstein
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AllianceBernstein’s Sionna Therapeutics SION Stock Holding History

AllianceBernstein’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 		$1.02M Buy
25,450
+9,040
+55% +$362K ﹤0.01% 2376
2026
Q1 		$675K Buy
16,410
+790
+5% +$30.1K ﹤0.01% 2500
2025
Q4 		$643K Buy
+15,620
New +$592K ﹤0.01% 2537

Other funds holding SION

RA Capital Management
RA Capital Management Boston, Massachusetts $11.5B AUM 168.77% 1-Year Est. Return
TPG GP A
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
Atlas Venture Life Science Advisors
Atlas Venture Life Science Advisors Cambridge, Massachusetts $881M AUM 160.77% 1-Year Est. Return
OrbiMed
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

AllianceBernstein's SION Position: Q2 2026 in Review

AllianceBernstein increased its Sionna Therapeutics (SION) stake by 55% in Q2 2026, buying an estimated $362K and bringing the position to 25,450 shares worth $1.02M. The position accounts for ﹤0.01% of the portfolio, ranked #2376.

AllianceBernstein first reported a position in SION in Q4 2025 and has held it in 3 quarters since. 146 funds tracked by Wall St. Rank hold SION as of Q2 2026.

  • AllianceBernstein held 25,450 shares of Sionna Therapeutics worth $1.02M as of Q2 2026.
  • AllianceBernstein bought 9,040 Sionna Therapeutics shares in Q2 2026, an estimated $362K.
  • Sionna Therapeutics made up ﹤0.01% of AllianceBernstein's portfolio in Q2 2026, its #2376 holding.
  • AllianceBernstein first reported a position in Sionna Therapeutics in Q4 2025 and has held it in 3 quarters since.
  • 146 funds tracked by Wall St. Rank held Sionna Therapeutics as of Q2 2026.

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