DYNE THERAPEUTICS INC

Ticker: DYN CUSIP: 26818M108 Class: Common Stock

RTW INVESTMENTS, LP's Holding History (CIK: 0001493215)

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

Q3 2025

Shares 2,890,567 Value ($000) $36,566 Avg Close $11.41 Range $8.06 - $14.35

Q2 2025

Shares 1,690,567 Value ($000) $16,094 Avg Close $11.01 Range $6.36 - $15.23

Q1 2025

Shares 1,690,567 Value ($000) $17,683 Avg Close $14.30 Range $9.96 - $26.22

Q4 2024

Shares 5,218,641 Value ($000) $122,951 Avg Close $29.58 Range $23.05 - $35.90

Q3 2024

Shares 6,818,641 Value ($000) $244,926 Avg Close $39.80 Range $23.55 - $47.45

Q2 2024

Shares 6,387,138 Value ($000) $225,402 Avg Close $29.06 Range $23.11 - $36.60

Q1 2024

Shares 3,091,587 Value ($000) $87,770 Avg Close $22.62 Range $12.33 - $30.27

Period	Shares	Value ($000)	Average Close	Price Range
Q3 2025	2,890,567	$36,566	$11.41	$8.06 - $14.35
Q2 2025	1,690,567	$16,094	$11.01	$6.36 - $15.23
Q1 2025	1,690,567	$17,683	$14.30	$9.96 - $26.22
Q4 2024	5,218,641	$122,951	$29.58	$23.05 - $35.90
Q3 2024	6,818,641	$244,926	$39.80	$23.55 - $47.45
Q2 2024	6,387,138	$225,402	$29.06	$23.11 - $36.60
Q1 2024	3,091,587	$87,770	$22.62	$12.33 - $30.27