As of March 23, 2026, Rhythm Pharmaceuticals's top three insider holders are Hunter C Smith (Chief Financial Officer, 116.61K shares), Yann Mazabraud (Evp, Head Of International, 53.16K shares), Pamela J. Cramer (Chief Human Resources Officer, 29.38K shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Hunter C Smith | Chief Financial Officer | 116,611 | 0 | 02 Mar, 2026 |
| Yann Mazabraud | Evp, Head Of International | 53,155 | 0 | 18 Feb, 2026 |
| Pamela J. Cramer | Chief Human Resources Officer | 29,376 | 0 | 03 Feb, 2026 |
| Jennifer Kayden Lee | Evp, Head Of North America | 19,233 | 0 | 03 Feb, 2026 |
| Joseph Shulman | Chief Technical Officer | 18,970 | 0 | 03 Feb, 2026 |
| Edward T Mathers | 0 | 14,168 | 16 Mar, 2026 | |
| William T. Roberts | Chief Accounting Officer | 7,872 | 0 | 31 Mar, 2023 |
| Alastair Garfield | Chief Scientific Officer | 7,763 | 0 | 03 Feb, 2026 |
| Stuart A Arbuckle | 7,000 | 0 | 23 Jun, 2025 | |
| Lynn A. Tetrault | 7,000 | 0 | 23 Jun, 2025 | |
| Edward T Mathers | 7,000 | 0 | 23 Jun, 2025 |
* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.
| Transaction Date | Insider Name | Security Class | Transaction Type | Shares Traded | Price | Shares Remaining | Ownership | Code |
|---|---|---|---|---|---|---|---|---|
| 12 Mar, 2026 | Edward T Mathers | Common Stock | A | 4,199 | $0.00 | 14,168 | I | J |
| 02 Mar, 2026 | Yann Mazabraud | Stock Options (Right to Buy) | A | 35,000 | $0.00 | 35,000 | D | A |
| 02 Mar, 2026 | Edward T Mathers | Common Stock | A | 4,198 | $0.00 | 9,969 | I | J |
| 02 Mar, 2026 | Hunter C Smith | Common Stock | A | 6,099 | $6.80 | 116,611 | D | M |
| 02 Mar, 2026 | Hunter C Smith | Stock Options (Right to Buy) | D | 6,099 | $0.00 | 91,401 | D | M |
| 17 Feb, 2026 | Hunter C Smith | Common Stock | D | 1,200 | $99.42 | 117,266 | D | S |
| 17 Feb, 2026 | Hunter C Smith | Common Stock | D | 200 | $100.52 | 117,066 | D | S |
| 17 Feb, 2026 | Hunter C Smith | Common Stock | D | 900 | $101.70 | 116,166 | D | S |
| 17 Feb, 2026 | Hunter C Smith | Common Stock | D | 1,069 | $103.00 | 115,097 | D | S |
| 17 Feb, 2026 | Hunter C Smith | Common Stock | D | 200 | $103.84 | 114,897 | D | S |
| 19 Feb, 2026 | Hunter C Smith | Common Stock | D | 1,308 | $100.27 | 113,589 | D | S |
| 19 Feb, 2026 | Hunter C Smith | Common Stock | D | 1,692 | $100.92 | 111,897 | D | S |
| 19 Feb, 2026 | Hunter C Smith | Common Stock | D | 800 | $102.10 | 111,097 | D | S |
| 19 Feb, 2026 | Hunter C Smith | Common Stock | D | 585 | $103.28 | 110,512 | D | S |
| 14 Feb, 2026 | Yann Mazabraud | Common Stock | A | 10,000 | - | 53,155 | D | M |
| 14 Feb, 2026 | Yann Mazabraud | Restricted Stock Units | D | 10,000 | $0.00 | 30,000 | D | M |
| 11 Feb, 2026 | Joseph Shulman | Restricted Stock Units | A | 15,000 | $0.00 | 15,000 | D | A |
| 11 Feb, 2026 | Alastair Garfield | Restricted Stock Units | A | 16,650 | $0.00 | 16,650 | D | A |
| 11 Feb, 2026 | Jennifer Kayden Lee | Restricted Stock Units | A | 21,650 | $0.00 | 21,650 | D | A |
| 11 Feb, 2026 | Yann Mazabraud | Restricted Stock Units | A | 23,350 | $0.00 | 23,350 | D | A |