Rhythm Pharmaceuticals, Inc. RYTM

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110.68 USD +24.24 (+28.04%)

At closeNov 4, 2026, 5:45 PM EST

108.49 -2.19 -1.98%

After hours · Nov 4, 5:45 PM ET

85.04 Day range 110.68

74.50 52-week range 122.20

Held by insiders 0.70%

Held by institutions 115.09%

Float held by institutions 115.90%

Institutions 439

Top institutional holders
Holder	% held	Shares	Value	Reported
RA Capital Management, L.P.	9.73%	6,666,837	737.89M	Jun 29, 2026
Blackrock Inc.	8.98%	6,156,902	681.45M	Jun 29, 2026
Baker Bros. Advisors, LP	8.18%	5,604,483	620.30M	Jun 29, 2026
Primecap Management Company	4.62%	3,168,853	350.73M	Jun 29, 2026
Vanguard Portfolio Management LLC	4.58%	3,136,895	347.19M	Jun 29, 2026
Vanguard Capital Management LLC	4.39%	3,005,977	332.70M	Jun 29, 2026

Top mutual fund holders
Holder	% held	Shares	Value	Reported
VANGUARD INDEX FUNDS-Vanguard Total Stock Market Index Fund	3.18%	2,176,750	240.92M	Jun 29, 2026
PRIMECAP Odyssey Funds-PRIMECAP Odyssey Aggressive Growth Fund	2.82%	1,935,739	214.25M	Sep 29, 2026
SmallCap World Fund Inc	2.58%	1,769,519	195.85M	Sep 29, 2026
VANGUARD INDEX FUNDS-Vanguard Small-Cap Index Fund	2.29%	1,572,293	174.02M	Jun 29, 2026
iShares Trust-iShares Russell 2000 ETF	2.18%	1,496,330	165.61M	Sep 29, 2026
SPDR SERIES TRUST-State Street SPDR S&P Biotech ETF	1.73%	1,184,359	131.08M	Sep 29, 2026

RYTM insiders
Insider	Relation	Latest transaction	Date	Shares held
CRAMER PAMELA J.	Officer	Conversion of Exercise of derivative security	Jan 29, 2026	29,376
GOOD JENNIFER L	Director	Conversion of Exercise of derivative security	Jun 22, 2026	11,712
JEAN CHRISTOPHE R	Director	Conversion of Exercise of derivative security	Jun 22, 2026	11,712
MATHERS EDWARD T.	Director	Conversion of Exercise of derivative security	Jun 17, 2025	12,771
MAZABRAUD YANN	Officer	Sale	Aug 11, 2026	55,655
MCGIRR DAVID W J	Director	Conversion of Exercise of derivative security	Jun 22, 2026	11,712

Held by funds