TPG GP A’s Sionna Therapeutics SION Stock Holding History

TPG GP A’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	$286M	Hold	6,494,962	–	–	5.71%	5
2026 Q1	$260M	Sell	6,494,962 -250,000	-4%	-$9.54M	7.08%	4
2025 Q4	$277M	Hold	6,744,962	–	–	10.33%	4
2025 Q3	$198M	Hold	6,744,962	–	–	10.8%	3
2025 Q2	$117M	Buy	6,744,962 +60,000	+0.9%	+$786K	6.24%	3
2025 Q1	$69.9M	Buy	+6,684,962	New	+$109M	1.38%	18

Other funds holding SION

RCM

RA Capital Management Boston, Massachusetts $11.5B AUM 168.77% 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

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

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

Adage Capital Partners Boston, Massachusetts $71.3B AUM 56.8% 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

Jennison Associates New York $167B AUM 44.17% 1-Year Est. Return

Citadel Advisors Miami, Florida $875B AUM 40.89% 1-Year Est. Return

TPG GP A's SION Position: Q2 2026 in Review

TPG GP A held its Sionna Therapeutics (SION) position steady in Q2 2026 at 6,494,962 shares worth $286M. The position accounts for 5.71% of the portfolio, ranked #5.

TPG GP A first reported a position in SION in Q1 2025 and has held it in 6 quarters since. 147 funds tracked by Wall St. Rank hold SION as of Q2 2026.

TPG GP A held 6,494,962 shares of Sionna Therapeutics worth $286M as of Q2 2026.
TPG GP A left its Sionna Therapeutics share count unchanged in Q2 2026.
Sionna Therapeutics made up 5.71% of TPG GP A's portfolio in Q2 2026, its #5 holding.
TPG GP A first reported a position in Sionna Therapeutics in Q1 2025 and has held it in 6 quarters since.
147 funds tracked by Wall St. Rank held Sionna Therapeutics as of Q2 2026.

Based on TPG GP A's 13F filing for Q2 2026, filed 14 Aug 2026.