Rhythm Pharmaceuticals
RYTM · NASDAQ
$90.20+$1.97 (+2.23%)TodayMarket closed ·
Prev close $88.23
Who owns RYTM
Largest institutional holders, from their latest 13F filings
The 10 largest institutions hold 52.7% of RYTM’s shares.
- RA Capital Management, LP9.7%
- Baker Bros. Advisors LP8.2%
- BlackRock Institutional Trust Company, N.A.6.6%
- PRIMECAP Management Company4.6%
- Next 6 largest institutions23.6%
- All other shareholders47.3%
| Holder | Shares | % of shares |
|---|---|---|
| RA Capital Management, LP | 6.67M | 9.73% |
| Baker Bros. Advisors LP | 5.60M | 8.18% |
| BlackRock Institutional Trust Company, N.A. | 4.54M | 6.63% |
| PRIMECAP Management Company | 3.17M | 4.62% |
| Vanguard Portfolio Management, LLC | 3.14M | 4.58% |
| Vanguard Capital Management, LLC | 3.01M | 4.39% |
| Perceptive Advisors LLC | 2.59M | 3.77% |
| State Street Investment Management (US) | 2.57M | 3.76% |
| T. Rowe Price Associates, Inc. | 2.49M | 3.63% |
| JP Morgan Asset Management | 2.36M | 3.44% |
Largest mutual fund holders
| Holder | Shares | % of shares |
|---|---|---|
| Vanguard Total Stock Market Index Fund | 2.18M | 3.19% |
| PRIMECAP Odyssey Aggressive Growth Fund | 1.99M | 2.90% |
| American Funds SMALLCAP World Fund | 1.71M | 2.49% |
| Vanguard Small-Cap Index Fund | 1.58M | 2.30% |
| Polar Capital Biotechnology Fund | 1.58M | 2.30% |
Insider trades
Form 4 filings by officers, directors and large holders
Over the last 6 months, insiders sold $32.94M (22 trades) of RYTM on the open market, with no buys.
| Insider | Type | Shares | Value |
|---|---|---|---|
| Meeker David P | Option exercise | 50.00K | — |
| Meeker David P | Sale | 2.30K | $241.94K |
| Meeker David P | Sale | 1.82K | $189.96K |
| Meeker David P | Sale | 8.70K | $899.63K |
| Meeker David P | Sale | 30.75K | $3.15M |
| Meeker David P | Sale | 6.44K | $655.15K |
| Meeker David P | Option exercise | 50.00K | $302.50K |
| Smith Hunter C | Option exercise | 57.19K | — |
| Smith Hunter C | Sale | 28.19K | $2.99M |
| Smith Hunter C | Sale | 11.51K | $1.21M |
Short interest
Settled Sep 30, 2026
- Shares short
- 10.77M
- Days to cover
- 14.14
- % of shares outstanding
- 15.71%
- Average daily volume
- 761.71K
- Change since last report
- +4.7%
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