TGA
SION

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
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 $9.44B AUM 157.3% 1-Year Est. Return
O
OrbiMed New York $5.05B AUM 125.28% 1-Year Est. Return
Viking Global Investors
Viking Global Investors Stamford, Connecticut $35.7B AUM 21.3% 1-Year Est. Return
AVLSA
Atlas Venture Life Science Advisors Cambridge, Massachusetts $790M AUM 223.66% 1-Year Est. Return
ES
Enavate Sciences Menlo Park, California $352M AUM 220.14% 1-Year Est. Return
Jennison Associates
Jennison Associates New York $145B AUM 34.61% 1-Year Est. Return
JP Morgan Chase
JP Morgan Chase New York $1.56T AUM 27.86% 1-Year Est. Return
BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
Citadel Advisors
Citadel Advisors Miami, Florida $618B AUM 30.34% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM

TPG GP A's SION Position: Q1 2026 in Review

TPG GP A reduced its Sionna Therapeutics (SION) stake by 3.7% in Q1 2026, selling an estimated $9.54M and leaving 6,494,962 shares worth $260M. The position accounts for 7.08% of the portfolio, ranked #4.

TPG GP A first reported a position in SION in Q1 2025 and has held it in 5 quarters since. The position peaked at $277M in Q4 2025. 122 funds tracked by Wall St. Rank hold SION as of Q1 2026.

  • TPG GP A held 6,494,962 shares of Sionna Therapeutics worth $260M as of Q1 2026.
  • TPG GP A sold 250,000 Sionna Therapeutics shares in Q1 2026, an estimated $9.54M.
  • Sionna Therapeutics made up 7.08% of TPG GP A's portfolio in Q1 2026, its #4 holding.
  • TPG GP A first reported a position in Sionna Therapeutics in Q1 2025 and has held it in 5 quarters since.
  • TPG GP A's Sionna Therapeutics position peaked at $277M in Q4 2025.
  • 122 funds tracked by Wall St. Rank held Sionna Therapeutics as of Q1 2026.

Based on TPG GP A's 13F filing for Q1 2026, filed 15 May 2026.