Braidwell’s Sionna Therapeutics SION Stock Holding History

Braidwell’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
2025 Q4	–	Sell	-314,013	Closed	-$9.24M	–	88
2025 Q3	$9.24M	Sell	314,013 -767,842	-71%	-$16.7M	0.27%	66
2025 Q2	$18.8M	Buy	+1,081,855	New	+$14.2M	0.64%	39

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

OrbiMed New York $5.4B AUM 163.13% 1-Year Est. Return

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

Enavate Sciences Menlo Park, California $345M AUM 134.64% 1-Year Est. Return

BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return

JP Morgan Chase New York $1.81T AUM 41.13% 1-Year Est. Return

Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return

Perceptive Advisors New York $6.66B AUM 360.84% 1-Year Est. Return

Braidwell's SION Position: Q4 2025 in Review

Braidwell sold out of Sionna Therapeutics (SION) in Q4 2025, closing a stake of 314,013 shares — an estimated $9.24M sold.

Braidwell first reported a position in SION in Q2 2025 and held it in 2 quarters. The position peaked at $18.8M in Q2 2025. 101 funds tracked by Wall St. Rank hold SION as of Q4 2025.

Braidwell reported no remaining Sionna Therapeutics position as of Q4 2025 after selling out during the quarter.
Braidwell sold 314,013 Sionna Therapeutics shares in Q4 2025, an estimated $9.24M.
Braidwell first reported a position in Sionna Therapeutics in Q2 2025 and held it in 2 quarters.
Braidwell's Sionna Therapeutics position peaked at $18.8M in Q2 2025.
101 funds tracked by Wall St. Rank held Sionna Therapeutics as of Q4 2025.

Based on Braidwell's 13F filing for Q4 2025, filed 17 Feb 2026.