SIONNA THERAPEUTICS INC

Ticker: SION CUSIP: 829401108 Class: Common Stock

Atlas Venture Life Science Advisors, LLC's Holding History (CIK: 0001917529)

Note: Option positions (PUT/CALL) are excluded.

Q4 2025

Shares 2,995,602 Value ($000) $123,239 Avg Close $37.92 Range $24.65 - $45.00

Q3 2025

Shares 3,615,527 Value ($000) $106,333 Avg Close $21.76 Range $16.14 - $30.61

Q2 2025

Shares 3,694,020 Value ($000) $64,091 Avg Close $13.10 Range $7.25 - $18.85

Q1 2025

Shares 3,694,020 Value ($000) $38,639 Avg Close $16.34 Range $10.27 - $25.19

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	2,995,602	$123,239	$37.92	$24.65 - $45.00
Q3 2025	3,615,527	$106,333	$21.76	$16.14 - $30.61
Q2 2025	3,694,020	$64,091	$13.10	$7.25 - $18.85
Q1 2025	3,694,020	$38,639	$16.34	$10.27 - $25.19