SEC Form 4 · Updated Daily
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— RHYTHM PHARMACEUTICALS, INC. OwnershipInsider and institutional ownership derived from SEC Form 4 filings. Click any owner to see their holdings across every company they’ve filed on, and how their position has changed over time.
Current Reporting Owners
| Owner | Role | Shares Owned | As Of | Last Activity |
|---|---|---|---|---|
| Meeker David P | Director · Officer | 239,016 | 2026-02-01 | F |
| Smith Hunter C | Officer | 114,024 | 2026-08-31 | S |
| Mazabraud Yann | Officer | 55,655 | 2026-08-12 | S |
| Shulman Joseph | Officer | 15,915 | 2026-08-13 | S |
| Mathers Edward T | Director | 14,168 | 2026-03-12 | J |
| MCGIRR DAVID W J | Director | 11,712 | 2026-06-23 | M |
| GOOD JENNIFER L | Director | 11,712 | 2026-06-23 | M |
| JEAN CHRISTOPHE | Director | 11,712 | 2026-06-23 | M |
| Arbuckle Stuart A | Director | 11,712 | 2026-06-23 | M |
| TETRAULT LYNN A. | Director | 11,712 | 2026-06-23 | M |
| Garfield Alastair | Officer | 2,295 | 2026-08-13 | S |
| German Christopher Paul | Officer | 0 | 2026-05-15 | S |
| Lee Jennifer Kayden | Officer | 0 | 2026-08-13 | S |
Recent Filings
| Date | Owner | Activity | Shares | Price | Owned After |
|---|---|---|---|---|---|
| 2026-08-31 | Smith Hunter C | Option exercise (derivative) | 57,187 | $0.00 | 3,813 |
| 2026-08-31 | Smith Hunter C | Open-market sale | 28,188 | $106.20 | 114,024 |
| 2026-08-31 | Smith Hunter C | Open-market sale | 11,514 | $105.37 | 142,212 |
| 2026-08-31 | Smith Hunter C | Open-market sale | 23,072 | $104.59 | 153,726 |
| 2026-08-31 | Smith Hunter C | Option exercise | 57,187 | $25.79 | 176,798 |
| 2026-08-17 | Joshi Manher | Grant / award (derivative) | 25,000 | $0.00 | 25,000 |
| 2026-08-17 | Joshi Manher | Grant / award (derivative) | 50,000 | $0.00 | 50,000 |
| 2026-08-13 | Lee Jennifer Kayden | Option exercise (derivative) | 21,601 | $0.00 | 0 |
| 2026-08-13 | Lee Jennifer Kayden | Option exercise (derivative) | 35,000 | $0.00 | 36,283 |
| 2026-08-13 | Lee Jennifer Kayden | Open-market sale | 75,834 | $117.38 | 0 |
| 2026-08-13 | Lee Jennifer Kayden | Option exercise | 21,601 | $6.80 | 75,834 |
| 2026-08-13 | Lee Jennifer Kayden | Option exercise | 35,000 | $24.29 | 54,233 |
| 2026-08-13 | Garfield Alastair | Open-market sale | 800 | $119.17 | 2,295 |
| 2026-08-13 | Garfield Alastair | Open-market sale | 3,400 | $118.28 | 3,095 |
| 2026-08-13 | Garfield Alastair | Open-market sale | 1,556 | $117.08 | 6,495 |
| 2026-08-13 | Garfield Alastair | Open-market sale | 2,007 | $116.11 | 8,051 |
| 2026-08-13 | Shulman Joseph | Option exercise (derivative) | 2,024 | $0.00 | 5,945 |
| 2026-08-13 | Shulman Joseph | Open-market sale | 5,079 | $119.75 | 15,915 |
| 2026-08-13 | Shulman Joseph | Option exercise | 2,024 | $6.80 | 20,994 |
| 2026-08-12 | Mazabraud Yann | Option exercise (derivative) | 46,625 | $0.00 | 35,875 |
| 2026-08-12 | Mazabraud Yann | Open-market sale | 17,319 | $117.47 | 55,655 |
| 2026-08-12 | Mazabraud Yann | Open-market sale | 18,208 | $116.49 | 72,974 |
| 2026-08-12 | Mazabraud Yann | Open-market sale | 14,568 | $115.43 | 91,182 |
| 2026-08-12 | Mazabraud Yann | Open-market sale | 3,605 | $114.70 | 105,750 |
| 2026-08-12 | Mazabraud Yann | Open-market sale | 1,000 | $112.86 | 109,355 |
| 2026-08-12 | Mazabraud Yann | Open-market sale | 2,300 | $111.80 | 110,355 |
| 2026-08-12 | Mazabraud Yann | Option exercise | 46,625 | $6.80 | 112,655 |
| 2026-07-01 | Garfield Alastair | Option exercise (derivative) | 4,445 | $0.00 | 8,888 |
| 2026-07-01 | Garfield Alastair | Tax withholding | 2,150 | $110.41 | 10,058 |
| 2026-07-01 | Garfield Alastair | Option exercise | 4,445 | — | 12,208 |
| 2026-06-24 | GOOD JENNIFER L | Grant / award (derivative) | 2,324 | $0.00 | 2,324 |
| 2026-06-24 | GOOD JENNIFER L | Grant / award (derivative) | 3,691 | $0.00 | 3,691 |
| 2026-06-24 | Arbuckle Stuart A | Grant / award (derivative) | 2,324 | $0.00 | 2,324 |
| 2026-06-24 | Arbuckle Stuart A | Grant / award (derivative) | 3,691 | $0.00 | 3,691 |
| 2026-06-24 | TETRAULT LYNN A. | Grant / award (derivative) | 2,324 | $0.00 | 2,324 |
| 2026-06-24 | TETRAULT LYNN A. | Grant / award (derivative) | 3,691 | $0.00 | 3,691 |
| 2026-06-24 | MCGIRR DAVID W J | Grant / award (derivative) | 2,324 | $0.00 | 2,324 |
| 2026-06-24 | MCGIRR DAVID W J | Grant / award (derivative) | 3,691 | $0.00 | 3,691 |
| 2026-06-24 | JEAN CHRISTOPHE | Grant / award (derivative) | 2,324 | $0.00 | 2,324 |
| 2026-06-24 | JEAN CHRISTOPHE | Grant / award (derivative) | 3,691 | $0.00 | 3,691 |
Source: SEC EDGAR Form 4 filings. For informational purposes only — not investment advice.