List of insiders holdings for RHYTHM PHARMACEUTICALS INC.:
- Shares directly owned by the insider.
- Shares indirectly owned by the insider.
- Total shares owned by the insider (sum of shares directly and indirectly owned).
- Total market value if available.
- Shares are not adjusted for stock split.
"Insiders might sell their shares for any number of reasons, but they buy them for only one: they think the price will rise"
- Peter Lynch
What is insider trading>>
- Peter Lynch
What is insider trading>>
| # | Insider Holder Name | Report Date Time | Shares Owned Directly Indirectly | Total Shares Owned | Filing |
| 1 | RA CAPITAL MANAGEMENT L.P. RA Capital Healthcare Fund LP Kolchinsky Peter Shah Rajeev M. Former 10% Owner | 2026-02-17 16:41:42 | 6,666,837 0 | 6,666,837 | Form 13G |
| 2 | BAKER BROS. ADVISORS LP Baker Bros. Advisors (GP) LLC BAKER FELIX BAKER JULIAN Former 10% owner | 2025-05-15 16:19:29 | 5,604,483 0 | 5,604,483 | Form 13G |
| 3 | Viswanathan Ravi 10% Owner | 2017-10-10 16:36:14 | 0 4,909,956 | 4,909,956 | Form 4 |
| 4 | SANDELL SCOTT D 10% Owner | 2017-10-10 16:35:43 | 0 4,909,956 | 4,909,956 | Form 4 |
| 5 | MOTT DAVID M 10% Owner | 2017-10-10 16:35:08 | 0 4,909,956 | 4,909,956 | Form 4 |
| 6 | KERINS PATRICK J 10% Owner | 2017-10-10 16:34:38 | 0 4,909,956 | 4,909,956 | Form 4 |
| 7 | BASKETT FOREST 10% Owner | 2017-10-10 16:34:07 | 0 4,909,956 | 4,909,956 | Form 4 |
| 8 | BARRIS PETER J 10% Owner | 2017-10-10 16:33:33 | 0 4,909,956 | 4,909,956 | Form 4 |
| 9 | BARRETT M JAMES 10% Owner | 2017-10-10 16:33:05 | 0 4,909,956 | 4,909,956 | Form 4 |
| 10 | MPM BIOVENTURES V L.P. EVNIN LUKE GADICKE ANSBERT MPM ASSET MANAGEMENT INVESTORS BV5 LLC MPM BIOVENTURES V GP LLC MPM BIOVENTURES V LLC 10% Owner | 2020-06-26 15:27:03 | 1,934,558 0 | 1,934,558 | Form 13D |
| 11 | Flynn James E Deerfield Mgmt L.P. DEERFIELD MANAGEMENT CO Deerfield Special Situations Fund L.P. Deerfield Mgmt III L.P. Deerfield Private Design Fund III L.P. Possible Member of 10% Group 10% Owner | 2022-02-11 16:17:09 | 1,867,467 0 | 1,867,467 | Form 13G |
| 12 | ORBIMED ADVISORS LLC OrbiMed Capital GP V LLC ISALY SAMUEL D 10% Owner | 2018-08-10 15:19:04 | 1,629,700 0 | 1,629,700 | Form 13D |
| 13 | ORBIMED ADVISORS LLC OrbiMed Capital GP V LLC See Remarks 10% Owner | 2018-08-10 15:19:04 | 1,629,700 0 | 1,629,700 | Form 13D |
| 14 | PFIZER INC 10% Owner | 2019-02-13 17:22:48 | 1,427,639 0 | 1,427,639 | Form 13G |
| 15 | Foley Todd Director | 2021-03-16 17:13:08 | 0 909,258 | 909,258 | Form 4 |
| 16 | Ipsen S.A. 10% Owner | 2017-10-10 16:22:25 | 0 833,099 | 833,099 | Form 4 |
| 17 | Gottesdiener Keith Michael CEO & President | 2020-03-11 16:01:46 | 766,127 0 | 766,127 | Form 4 |
| 18 | Hadley Harbor Master Investors (Cayman) L.P. 10% Owner | 2017-10-10 16:06:42 | 545,256 0 | 545,256 | Form 4 |
| 19 | THIRD ROCK VENTURES LP Third Rock Ventures GP L.P. TRV GP LLC STARR KEVIN P TEPPER ROBERT I LEVIN MARK J 10% Owner | 2020-02-05 16:36:37 | 323,526 0 | 323,526 | Form 13G |
| 20 | Smith Hunter C Chief Financial Officer | 2026-03-02 20:56:40 | 208,012 0 | 208,012 | Form 4 |
| 21 | Meeker David P President and CEO | 2026-02-13 17:52:16 | 179,750 0 | 179,750 | Form 4 |
| 22 | Desikan Nithya Chief Commercial Officer | 2020-09-01 16:05:32 | 141,563 0 | 141,563 | Form 4 |
| 23 | Manning Linda Shapiro Chief Medical Officer | 2022-02-11 21:34:18 | 87,500 0 | 87,500 | Form 4 |
| 24 | Stewart Murray Chief Medical Officer | 2021-02-16 17:27:45 | 65,625 0 | 65,625 | Form 4 |
| 25 | Van der Ploeg Leonardus H.T. Chief Scientific Officer | 2019-06-03 16:00:34 | 64,561 0 | 64,561 | Form 4 |
| 26 | Lee Jennifer Kayden EVP, Head of North America | 2026-02-13 17:49:52 | 54,150 0 | 54,150 | Form 4 |
| 27 | Fiedorek Fred T. Chief Medical Officer | 2018-02-16 16:03:11 | 50,000 0 | 50,000 | Form 4 |
| 28 | Kelner Simon Chief Human Resources Officer | 2021-02-16 17:28:31 | 43,750 0 | 43,750 | Form 4 |
| 29 | Garfield Alastair Chief Scientific Officer | 2026-02-13 17:47:38 | 41,650 0 | 41,650 | Form 4 |
| 30 | Shulman Joseph Chief Technical Officer | 2026-02-13 17:53:16 | 37,500 0 | 37,500 | Form 4 |
| 31 | Mazabraud Yann EVP, Head of International | 2026-03-04 20:22:48 | 35,000 0 | 35,000 | Form 4 |
| 32 | Cramer Pamela J. Chief Human Resources Officer | 2026-02-13 17:45:44 | 29,150 0 | 29,150 | Form 4 |
| 33 | Mathers Edward T Director | 2026-03-16 16:11:55 | 7,000 18,367 | 25,367 | Form 4 |
| 34 | Roberts William T. Chief Accounting Officer | 2023-03-31 21:38:20 | 12,872 0 | 12,872 | Form 4 |
| 35 | GOOD JENNIFER L Director | 2025-06-26 16:45:20 | 11,749 0 | 11,749 | Form 4 |
| 36 | Bedrosian Camille L Director | 2025-06-26 16:56:04 | 11,749 0 | 11,749 | Form 4 |
| 37 | JEAN CHRISTOPHE Director | 2025-06-26 16:41:21 | 11,749 0 | 11,749 | Form 4 |
| 38 | Arbuckle Stuart A Director | 2025-06-26 16:37:52 | 11,749 0 | 11,749 | Form 4 |
| 39 | TETRAULT LYNN A. Director | 2025-06-26 16:33:39 | 11,749 0 | 11,749 | Form 4 |
| 40 | MCGIRR DAVID W J Director | 2025-06-26 16:30:46 | 11,749 0 | 11,749 | Form 4 |
| 41 | Exter Neil Director | 2018-06-08 16:06:46 | 10,000 0 | 10,000 | Form 4 |
| 42 | German Christopher Paul Corporate Controller & CAO | 2026-03-06 16:51:07 | 3,891 0 | 3,891 | Form 4 |
| 43 | NEW ENTERPRISE ASSOCIATES 13 LP NEA Partners 13 Limited Partnership NEA 13 GP Ltd 10% Owner | 2024-04-30 19:31:21 | 0 0 | 0 | Form 13D |
| 44 | SILVERSTEIN JONATHAN Director | 2017-10-10 16:21:10 | 0 0 | 0 | Form 4 |