13F

Stock

Rhythm Pharmaceuticals, Inc.

RYTM · held by 280 managers

Reported value

$7.54B

Holders

280

+3 new · −0 exited

Holders’ est. mark

$8.56M

Price effect on 8 books still in the name

Largest holder

$713.6M

RA CAPITAL MANAGEMENT, L.P.

Notable conviction

Share of each notable manager’s 13F book.

Holder count by quarter

Who holds it

Notable only
InvestorSharesValueEst. markChange
RA CAPITAL MANAGEMENT, L.P.6.67M$713.6MHeld
BlackRock, Inc.6.3M$674.1MHeld
Vanguard6.21M$664.8MHeld
BAKER BROS. ADVISORS LP5.6M$599.9MHeld
PRIMECAP MANAGEMENT CO/CA/3.48M$372.4MHeld
NEA Management Company, LLC2.91M$311.5MHeld
PERCEPTIVE ADVISORS LLC2.55M$272.6MHeld
State Street2.2M$235.3MHeld
GOLDMAN SACHS GROUP INC1.83M$196MHeld
Fidelity1.71M$182.6MHeld
FEDERATED HERMES, INC.1.62M$173.8MHeld
JPMORGAN CHASE & CO1.42M$152.4MHeld
GEODE CAPITAL MANAGEMENT, LLC1.38M$147.3MHeld
Driehaus Capital Management LLC1.29M$137.6MHeld
WESTFIELD CAPITAL MANAGEMENT CO LP1.27M$135.6MHeld
Polar Capital Holdings Plc1.19M$126.9MHeld
JANUS HENDERSON GROUP PLC1.13M$120.6MHeld
Checkpoint Capital L.P.992.2K$106.2MHeld
Capital Research Global Investors985.1K$105.4MHeld
ALLIANCEBERNSTEIN L.P.930.2K$99.6MHeld
JENNISON ASSOCIATES LLC918.6K$98.3MHeld
FRANKLIN RESOURCES INC695.7K$74.5MHeld
Rock Springs Capital Management LP695K$74.4MHeld
Woodline Partners LP688.8K$73.7MHeld
MORGAN STANLEY651.4K$69.7M$2.81MAdded$22.7M
ADAGE CAPITAL PARTNERS GP, L.L.C.621.6K$66.5MHeld
Pictet Asset Management Holding SA614.7K$66.2MHeld
UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC549K$58.8MHeld
CHARLES SCHWAB INVESTMENT MANAGEMENT INC532.4K$57MHeld
Clearbridge Investments, LLC506.1K$54.2MHeld
LOOMIS SAYLES & CO L P503.9K$53.9MHeld
Siren, L.L.C.500K$53.5MHeld
NORTHERN TRUST CORP488.2K$52.3MHeld
Integral Health Asset Management, LLC475K$50.8MHeld
Point72 Asset Management, L.P.429.4K$46MHeld
UBS Group AG427.2K$45.7MHeld
Renaissance Technologies341.2K$36.5MHeld
Opaleye Management Inc.330K$35.3MHeld
Qube Research & Technologies Ltd310.9K$33.3MHeld
Bank of New York Mellon Corp301.1K$32.2MHeld
First Light Asset Management, LLC295.8K$31.7MHeld
Invesco Ltd.291.1K$31.2MHeld
Candriam S.C.A.287.9K$30.8MHeld
Sofinnova Investments, Inc.271.4K$29.1MHeld
Artisan Partners Limited Partnership263.6K$28.2MHeld
AMERIPRISE FINANCIAL INC261.2K$28MHeld
WELLINGTON MANAGEMENT GROUP LLP250.2K$26.8MHeld
VOYA INVESTMENT MANAGEMENT LLC249.9K$26.7MHeld
ORBIMED ADVISORS LLC239.8K$25.7MHeld
Hood River Capital Management LLC237K$25.4MHeld
BANK OF AMERICA CORP /DE/224.5K$24M$1.36MAdded$482.9K
Logos Global Management LP190K$20.3MHeld
MILLENNIUM MANAGEMENT LLC186.7K$20MHeld
BNP PARIBAS FINANCIAL MARKETS164.6K$17.6MHeld
Citadel153.3K$16.4MHeld
Connor, Clark & Lunn Investment Management Ltd.149.4K$16MHeld
First Turn Management, LLC146.3K$15.7MHeld
M&G PLC137.1K$14.7MHeld
SILVERARC CAPITAL MANAGEMENT, LLC135.9K$14.6MHeld
Russell Investments Group, Ltd.134.2K$14.4MHeld
BARCLAYS PLC131.4K$14.1M$795.2KCut−$310.6K
DEUTSCHE BANK AG\129.1K$13.8MHeld
Universal- Beteiligungs- und Servicegesellschaft mbH123.5K$13.2MHeld
Nuveen, LLC115.9K$12.4MHeld
Capital World Investors115.7K$12.4MHeld
Swiss National Bank111.3K$11.9MHeld
NEW YORK STATE COMMON RETIREMENT FUND93.7K$10MHeld
FIRST TRUST ADVISORS LP88.5K$9.47MHeld
AXIOM INVESTORS LLC /DE83.6K$8.94MHeld
Zweig-DiMenna Associates LLC81.6K$8.73MHeld
SummitTX Capital, L.P.80.7K$8.64MHeld
ExodusPoint Capital Management, LP75.1K$8.04MHeld
NEUBERGER BERMAN GROUP LLC73.6K$7.88MHeld
WELLS FARGO & COMPANY/MN72.6K$7.77MHeld
Balyasny Asset Management L.P.72.3K$7.74MHeld
RHUMBLINE ADVISERS71.2K$7.62MHeld
Icahn Capital70K$7.5MHeld
NEXTBio Capital Management LP67.6K$7.23MHeld
NORGES BANK66.2K$7.09M$3.58MCut−$4.75M
CASTLEARK MANAGEMENT LLC64.5K$6.9MHeld
VOLORIDGE INVESTMENT MANAGEMENT, LLC60.6K$6.48MHeld
MANUFACTURERS LIFE INSURANCE COMPANY, THE59.6K$6.37MHeld
PDT Partners, LLC59.4K$6.36MHeld
STEMPOINT CAPITAL LP58.9K$6.31MHeld
Informed Momentum Co LLC57.3K$6.14MHeld
Rafferty Asset Management, LLC55.5K$5.94MHeld
Legal & General Group Plc55.1K$5.9MHeld
TD Asset Management Inc55K$5.89MHeld
CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM53.5K$5.73MHeld
Granahan Investment Management, LLC53.5K$5.72MHeld
PRUDENTIAL FINANCIAL INC53.1K$5.69MHeld
ADAR1 Capital Management, LLC51.3K$5.5MHeld
Nan Fung Group Holdings Ltd49.1K$5.26MHeld
VICTORY CAPITAL MANAGEMENT INC45.4K$4.86MHeld
WCM INVESTMENT MANAGEMENT, LLC44.8K$4.78MHeld
Harvest Investment Services, LLC44K$4.7MHeld
HighVista Strategies LLC42.9K$4.59MHeld
Hillsdale Investment Management Inc.42.3K$4.53MHeld
RAYMOND JAMES FINANCIAL INC41.1K$4.4MHeld
PFM Health Sciences, LP40.2K$4.3MHeld
KENNEDY CAPITAL MANAGEMENT LLC39.9K$4.27MHeld
SEI INVESTMENTS CO37.4K$4.01MHeld
STATE OF WISCONSIN INVESTMENT BOARD36.1K$3.86MHeld
Rhenman & Partners Asset Management AB35K$3.75MHeld
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.34.9K$3.73MHeld
Nicholas Investment Partners, LP34.7K$3.72MHeld
SILVERCREST ASSET MANAGEMENT GROUP LLC34.1K$3.65MHeld
Squarepoint Ops LLC32.8K$3.51MHeld
DIMENSIONAL FUND ADVISORS LP32K$3.43MHeld
D. E. Shaw & Co., Inc.31.4K$3.36MHeld
Magnetar Financial LLC29.6K$3.17MHeld
EFG International AG29.3K$3.14MHeld
MetLife Investment Management, LLC29.2K$3.12MHeld
LAZARD ASSET MANAGEMENT LLC25.6K$2.74MHeld
LOS ANGELES CAPITAL MANAGEMENT LLC24.3K$2.72MHeld
Creative Planning25.2K$2.7MHeld
Atom Investors LP22.9K$2.45MHeld
INTECH INVESTMENT MANAGEMENT LLC21.4K$2.29MHeld
PROFUND ADVISORS LLC21K$2.25MHeld
State of New Jersey Common Pension Fund D19.3K$2.06MHeld
WEDGE CAPITAL MANAGEMENT L L P/NC19.2K$2.06MHeld
Advisors Asset Management, Inc.18.5K$1.98MHeld
CAPTRUST FINANCIAL ADVISORS18.3K$1.96MHeld
ARIZONA STATE RETIREMENT SYSTEM15.8K$1.69MHeld
STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM14.7K$1.57MHeld
Police & Firemen's Retirement System of New Jersey14.2K$1.52MHeld
STIFEL FINANCIAL CORP13.2K$1.42MHeld
NISA INVESTMENT ADVISORS, LLC13.1K$1.41MHeld
CITIGROUP INC12.7K$1.36MHeld
ProShare Advisors LLC12.6K$1.35MHeld
Zurcher Kantonalbank (Zurich Cantonalbank)12.4K$1.33MHeld
GUGGENHEIM CAPITAL LLC12.4K$1.33MHeld
KLP KAPITALFORVALTNING AS12K$1.28MHeld
STRS OHIO12K$1.28MHeld
Rockefeller Capital Management L.P.11.8K$1.26MHeld
DNB Asset Management AS11.2K$1.19MHeld
Hennion & Walsh Asset Management, Inc.10.9K$1.17MHeld
China Universal Asset Management Co., Ltd.10.9K$1.16MHeld
XTX Topco Ltd10.4K$1.12MHeld
Knights of Columbus Asset Advisors LLC10.3K$1.1MHeld
Cannon Financial Strategists, Inc.10K$1.07MHeld
TOTH FINANCIAL ADVISORY CORP10K$1.07MHeld
Man Group plc9.56K$1.02MHeld
FRED ALGER MANAGEMENT, LLC9.3K$995.6KHeld
VIRGINIA RETIREMENT SYSTEMS ET Al9.2K$984.8KHeld
Headlands Technologies LLC8.63K$924KHeld
TEACHER RETIREMENT SYSTEM OF TEXAS8.36K$894.7KHeld
Allianz Asset Management GmbH8K$856.3KHeld
Bellevue Group AG7.5K$803.2KHeld
Leo Wealth, LLC6.95K$744.1KHeld
Jump Financial, LLC6.76K$723.5KHeld
E. Ohman J:or Asset Management AB6.59K$705.3KHeld
PRINCIPAL FINANCIAL GROUP INC6.2K$663.4KHeld
EXCHANGE TRADED CONCEPTS, LLC6.08K$650.8KHeld
Virtus Investment Advisers, LLC6.02K$644.1KHeld
Legato Capital Management LLC5.72K$612.6KHeld
Jasper Ridge Partners, L.P.5.64K$603.6KHeld
Quantedge Capital Pte Ltd5.6K$599.4KHeld
LPL Financial LLC5.43K$580.9KHeld
AlphaCentric Advisors LLC5.05K$540.8KHeld
Voleon Capital Management LP5.03K$537.9KHeld
TWO SIGMA SECURITIES, LLC4.94K$529.1KHeld
Gotham Asset Management, LLC4.85K$519.3KHeld
PSP Research LLC4.74K$507.2KHeld
PNC Financial Services Group, Inc.4.66K$498.7KHeld
Caption Management, LLC4.61K$493.9KHeld
Vestmark Advisory Solutions, Inc.4.56K$488.1KHeld
Verition Fund Management LLC4.5K$482.1KHeld
MACKENZIE FINANCIAL CORP4.4K$468.6KHeld
Ameritas Investment Partners, Inc.4.37K$467.2KHeld
XPONANCE LLC4.27K$457KHeld
Empowered Funds, LLC4.16K$445.7KHeld
SUSQUEHANNA INTERNATIONAL GROUP, LLP4.1K$438.5KHeld
COMERICA BANK4.01K$429.6KHeld
Ensign Peak Advisors, Inc3.86K$413.1KHeld
Quantinno Capital Management LP3.83K$410.1KHeld
Freestone Capital Holdings, LLC3.7K$396KHeld
Cerity Partners LLC3.66K$392.2KHeld
O'SHAUGHNESSY ASSET MANAGEMENT, LLC3.58K$383.2KHeld
Avior Wealth Management, LLC3.57K$382.3KHeld
CIBC WORLD MARKETS CORP3.5K$374.9KHeld
Tidal Investments LLC3.34K$357.1KHeld
KEYBANK NATIONAL ASSOCIATION/OH3.27K$350.1KHeld
Mirae Asset Global Investments Co., Ltd.3.24K$347.1KHeld
Cinctive Capital Management LP3.23K$345.2KHeld
Yorktown Management & Research Co Inc3.05K$326.5KHeld
CIM INVESTMENT MANAGEMENT INC2.99K$320.4KHeld
Tower Research Capital LLC (TRC)2.96K$317.1KHeld
TWO SIGMA ADVISERS, LP2.9K$310.4KHeld
Blueshift Asset Management, LLC2.88K$308.4KHeld
JGP Global Gestao de Recursos Ltda.2.87K$306.8KHeld
CIBC Asset Management Inc2.85K$304.9KHeld
Swiss Life Asset Management Ltd2.65K$284K$14.9KAdded$35.4K
Chicago Partners Investment Group LLC2.74K$281.8KHeld
Entropy Technologies, LP2.49K$266.7KHeld
State of Wyoming2.44K$261.3KHeld
Vanguard Personalized Indexing Management, LLC2.38K$254.6KHeld
Abel Hall, LLC2.14K$229.1KHeld
M&T Bank Corp2.1K$224.9KHeld
Cambria Investment Management, L.P.2K$213.8KNew
ELEVATION WEALTH PARTNERS, LLC1.97K$211KHeld
JANE STREET GROUP, LLC1.96K$209.8KHeld
WHITTIER TRUST CO1.81K$180.1KHeld
ROYAL BANK OF CANADA1.68K$180KHeld
PRICE T ROWE ASSOCIATES INC /MD/1.56M$167.1KHeld
AlphaQuest LLC1.51K$161.4KHeld
Persistent Asset Partners Ltd1.45K$154.8KNew
GF FUND MANAGEMENT CO. LTD.1.31K$140.2KHeld
Clearstead Advisors, LLC1.25K$133.4KHeld
DANSKE BANK A/S1.1K$117.7KNew
OSAIC HOLDINGS, INC.1.04K$111.2KHeld
US BANCORP \DE\953$102KHeld
Global Retirement Partners, LLC857$91.7KHeld
CFG Wealth Management Services, Inc.800$85.6KHeld
Farther Finance Advisors, LLC642$68.7KHeld
LORD, ABBETT & CO. LLC619.5K$66.3KHeld
Smartleaf Asset Management LLC399$42.6KHeld
Arax Advisory Partners381$40.8KHeld
GAMMA Investing LLC361$38.6KHeld
Sterling Capital Management LLC344$36.8KHeld
SBI Securities Co., Ltd.343$36.7KHeld
EverSource Wealth Advisors, LLC266$28.5KHeld
SIGNATUREFD, LLC232$24.8KHeld
JONES FINANCIAL COMPANIES LLLP231$24.7KHeld
Essential Partners LLC223$23.9K$1.2KAdded$3.87K
Kemnay Advisory Services Inc.207$22.2KHeld
True Wealth Design, LLC147$15.7KHeld
Truvestments Capital LLC138$14.8KHeld
AdvisorNet Financial, Inc137$14.7KHeld
Bayforest Capital Ltd134$14.3KHeld
Allworth Financial LP109$11.7K$660Cut−$1.56K
Optiver Holding B.V.92$9.85KHeld
ROTHSCHILD INVESTMENT LLC91$9.74KHeld
ALGERT GLOBAL LLC88.3K$9.45KHeld
Quarry LP77$8.24KHeld
Larson Financial Group LLC77$8.24KHeld
HARBOUR INVESTMENTS, INC.60$6.42KHeld
WPG Advisers, LLC60$6.42KHeld
EASTERN BANK59$6.32KHeld
Root Financial Partners, LLC43$4.6KHeld
HARBOR CAPITAL ADVISORS, INC.40.9K$4.38KHeld
ORG Partners LLC37$3.96KHeld
IFP Advisors, Inc36$3.85K$115Added$1.93K
Versant Capital Management, Inc36$3.85KHeld
Parkside Financial Bank & Trust33$3.53KHeld
SageView Advisory Group, LLC30$3.21KHeld
FIRST HORIZON CORP30$3.21KHeld
Parallel Advisors, LLC25$2.68KHeld
Bare Financial Services, Inc22$2.35KHeld
Penserra Capital Management LLC21.5K$2.3KHeld

Positions as of Q4 2025. 13F filings arrive up to 45 days after quarter-end and omit shorts. Values are quarter-end marks, as filed. Estimated mark is the price effect on shares still held — not realized P&L or investment advice.