MS
SION

Maven Securities’s Sionna Therapeutics SION Stock Holding History

Maven Securities’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 		$880K Sell
20,000
-5,000
-20% -$200K 0.02% 277
2026
Q1 		$1M Buy
+25,000
New +$954K 0.02% 328

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

Maven Securities's SION Position: Q2 2026 in Review

Maven Securities reduced its Sionna Therapeutics (SION) stake by 20% in Q2 2026, selling an estimated $200K and leaving 20,000 shares worth $880K. The position accounts for 0.02% of the portfolio, ranked #277.

Maven Securities first reported a position in SION in Q1 2026 and has held it in 2 quarters since. The position peaked at $1M in Q1 2026. 147 funds tracked by Wall St. Rank hold SION as of Q2 2026.

  • Maven Securities held 20,000 shares of Sionna Therapeutics worth $880K as of Q2 2026.
  • Maven Securities sold 5,000 Sionna Therapeutics shares in Q2 2026, an estimated $200K.
  • Sionna Therapeutics made up 0.02% of Maven Securities's portfolio in Q2 2026, its #277 holding.
  • Maven Securities first reported a position in Sionna Therapeutics in Q1 2026 and has held it in 2 quarters since.
  • Maven Securities's Sionna Therapeutics position peaked at $1M in Q1 2026.
  • 147 funds tracked by Wall St. Rank held Sionna Therapeutics as of Q2 2026.

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