DYNE THERAPEUTICS INC

Ticker: DYN CUSIP: 26818M108 Class: Common Stock

FRONTIER CAPITAL MANAGEMENT CO LLC's Holding History (CIK: 0000351173)

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

Q4 2025

Shares 1,138,868 Value ($000) $22,276 Avg Close $18.94 Range $12.33 - $25.00

Q3 2025

Shares 910,919 Value ($000) $11,523 Avg Close $11.41 Range $8.06 - $14.35

Q2 2025

Shares 789,425 Value ($000) $7,515 Avg Close $11.01 Range $6.36 - $15.23

Q1 2025

Shares 289,603 Value ($000) $3,029 Avg Close $14.30 Range $9.96 - $26.22

Q4 2024

Shares 298,052 Value ($000) $7,022 Avg Close $29.58 Range $23.05 - $35.90

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	1,138,868	$22,276	$18.94	$12.33 - $25.00
Q3 2025	910,919	$11,523	$11.41	$8.06 - $14.35
Q2 2025	789,425	$7,515	$11.01	$6.36 - $15.23
Q1 2025	289,603	$3,029	$14.30	$9.96 - $26.22
Q4 2024	298,052	$7,022	$29.58	$23.05 - $35.90