DYNE THERAPEUTICS INC

Ticker: DYN CUSIP: 26818M108 Class: Common Stock

Optiver Holding B.V.'s Holding History (CIK: 0001859606)

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

Q4 2025

Shares 395 Value ($000) $8 Avg Close $18.94 Range $12.33 - $25.00

Q3 2025

Shares 903 Value ($000) $11 Avg Close $11.41 Range $8.06 - $14.35

Q2 2025

Shares 753 Value ($000) $7 Avg Close $11.01 Range $6.36 - $15.23

Q1 2025

Shares 197 Value ($000) $2 Avg Close $14.30 Range $9.96 - $26.22

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	395	$8	$18.94	$12.33 - $25.00
Q3 2025	903	$11	$11.41	$8.06 - $14.35
Q2 2025	753	$7	$11.01	$6.36 - $15.23
Q1 2025	197	$2	$14.30	$9.96 - $26.22