DYNE THERAPEUTICS INC

Ticker: DYN CUSIP: 26818M108 Class: Common Stock

MPM BioImpact LLC's Holding History (CIK: 0001687078)

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

Q4 2025

Shares 1,405,388 Value ($000) $27,489 Avg Close $18.94 Range $12.33 - $25.00

Q3 2025

Shares 1,446,361 Value ($000) $18,296 Avg Close $11.41 Range $8.06 - $14.35

Q2 2025

Shares 1,446,361 Value ($000) $13,769 Avg Close $11.01 Range $6.36 - $15.23

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	1,405,388	$27,489	$18.94	$12.33 - $25.00
Q3 2025	1,446,361	$18,296	$11.41	$8.06 - $14.35
Q2 2025	1,446,361	$13,769	$11.01	$6.36 - $15.23