RHYTHM PHARMACEUTICALS INC

Ticker: RYTM CUSIP: 76243J105 Class: Common Stock

WESTFIELD CAPITAL MANAGEMENT CO LP's Holding History (CIK: 0001177719)

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

Q4 2025

Shares 1,267,158 Value ($000) $135,637 Avg Close $106.08 Range $95.27 - $122.20

Q3 2025

Shares 1,069,004 Value ($000) $107,959 Avg Close $92.84 Range $62.84 - $106.52

Q2 2025

Shares 1,629,468 Value ($000) $102,966 Avg Close $61.23 Range $45.91 - $69.89

Q1 2025

Shares 1,341,092 Value ($000) $71,038 Avg Close $55.48 Range $47.86 - $62.14

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	1,267,158	$135,637	$106.08	$95.27 - $122.20
Q3 2025	1,069,004	$107,959	$92.84	$62.84 - $106.52
Q2 2025	1,629,468	$102,966	$61.23	$45.91 - $69.89
Q1 2025	1,341,092	$71,038	$55.48	$47.86 - $62.14