RHYTHM PHARMACEUTICALS, INC.
Total Trades
152
Buys
0
Sells
83
Largest Trade
N/A
Insiders
13
Institutional Funds
217
Inst. Value
$1M+
Activist Filings
46
Insider Trades
| Insider | Title | Type | Value | Shares | Price | Date |
|---|---|---|---|---|---|---|
| Shulman Joseph | Chief Technical Of… | SELL | $500K+ | 28K | $32.07 | Nov 16, 2023 |
| Lee Jennifer Kayden | EVP | SELL | $100K–$500K | 14K | $32.01 | Nov 16, 2023 |
| Lee Jennifer Kayden | EVP | EXERCISE | $50K–$100K | 12K | $6.80 | Nov 16, 2023 |
| Smith Hunter C | CFO | SELL | $100K–$500K | 12K | $30.38 | Nov 16, 2023 |
| Smith Hunter C | CFO | EXERCISE | $50K–$100K | 12K | $6.88 | Nov 16, 2023 |
| Lee Jennifer Kayden | EVP | EXERCISE | $50K–$100K | 9K | $6.80 | Nov 13, 2023 |
| Lee Jennifer Kayden | EVP | SELL | $100K–$500K | 9K | $28.45 | Nov 13, 2023 |
| Lee Jennifer Kayden | EVP | SELL | $1K–$15K | 80 | $28.00 | Nov 7, 2023 |
| Lee Jennifer Kayden | EVP | EXERCISE | <$1K | 80 | $6.80 | Nov 7, 2023 |
| Lee Jennifer Kayden | EVP | SELL | $100K–$500K | 6K | $28.05 | Sep 7, 2023 |
| Lee Jennifer Kayden | EVP | EXERCISE | $15K–$50K | 5K | $6.80 | Sep 7, 2023 |
| Lee Jennifer Kayden | EVP | EXERCISE | $50K–$100K | 10K | $6.80 | Aug 9, 2023 |
| Lee Jennifer Kayden | EVP | SELL | $100K–$500K | 13K | $24.24 | Aug 9, 2023 |
| Cramer Pamela J. | CHRO | SELL | $15K–$50K | 930 | $17.64 | Jul 29, 2023 |
| Cramer Pamela J. | CHRO | EXERCISE | N/A | 3K | — | Jul 29, 2023 |
| Roberts William T. | Chief Accounting O… | SELL | $15K–$50K | 912 | $17.50 | Apr 1, 2023 |
| Roberts William T. | Chief Accounting O… | EXERCISE | N/A | 3K | — | Apr 1, 2023 |
| Mazabraud Yann | EVP | SELL | $15K–$50K | 1K | $27.03 | Feb 16, 2023 |
| Shulman Joseph | Chief Technical Of… | EXERCISE | N/A | 2K | — | Feb 15, 2023 |
| Shulman Joseph | Chief Technical Of… | SELL | $1K–$15K | 554 | $26.87 | Feb 15, 2023 |
| Chien Jennifer | EVP | SELL | $15K–$50K | 635 | $26.87 | Feb 15, 2023 |
| Chien Jennifer | EVP | EXERCISE | N/A | 2K | — | Feb 15, 2023 |
| Smith Hunter C | CFO | EXERCISE | N/A | 2K | — | Feb 15, 2023 |
| Smith Hunter C | CFO | SELL | $15K–$50K | 702 | $26.87 | Feb 15, 2023 |
| Chien Jennifer | EVP | SELL | $15K–$50K | 1K | $27.66 | Feb 13, 2023 |
| Chien Jennifer | EVP | EXERCISE | N/A | 3K | — | Feb 13, 2023 |
| Smith Hunter C | CFO | SELL | $15K–$50K | 1K | $27.66 | Feb 13, 2023 |
| Smith Hunter C | CFO | EXERCISE | N/A | 4K | — | Feb 13, 2023 |
| Mazabraud Yann | EVP | SELL | $15K–$50K | 2K | $27.66 | Feb 13, 2023 |
| Mazabraud Yann | EVP | EXERCISE | N/A | 3K | — | Feb 13, 2023 |
| Roberts William T. | Chief Accounting O… | SELL | $15K–$50K | 959 | $27.66 | Feb 13, 2023 |
| Roberts William T. | Chief Accounting O… | EXERCISE | N/A | 2K | — | Feb 13, 2023 |
| Cramer Pamela J. | CHRO | SELL | $15K–$50K | 834 | $27.66 | Feb 13, 2023 |
| Cramer Pamela J. | CHRO | EXERCISE | N/A | 2K | — | Feb 13, 2023 |
| Shulman Joseph | Chief Technical Of… | SELL | $15K–$50K | 921 | $27.66 | Feb 13, 2023 |
| Shulman Joseph | Chief Technical Of… | EXERCISE | N/A | 3K | — | Feb 13, 2023 |
| Cramer Pamela J. | CHRO | SELL | $100K–$500K | 13K | $24.83 | Aug 23, 2022 |
| Cramer Pamela J. | CHRO | EXERCISE | $100K–$500K | 13K | $19.02 | Aug 23, 2022 |
| Cramer Pamela J. | CHRO | SELL | $1K–$15K | 901 | $11.68 | Jul 28, 2022 |
| Cramer Pamela J. | CHRO | EXERCISE | N/A | 3K | — | Jul 28, 2022 |
| Smith Hunter C | CFO | EXERCISE | N/A | 25K | — | Jul 6, 2022 |
| Smith Hunter C | CFO | SELL | $15K–$50K | 8K | $4.08 | Jul 6, 2022 |
| Roberts William T. | Chief Accounting O… | SELL | $1K–$15K | 1K | $11.13 | Mar 31, 2022 |
| Roberts William T. | Chief Accounting O… | EXERCISE | N/A | 3K | — | Mar 31, 2022 |
| Shulman Joseph | Chief Technical Of… | EXERCISE | N/A | 2K | — | Feb 16, 2022 |
| Shulman Joseph | Chief Technical Of… | SELL | $1K–$15K | 557 | $6.10 | Feb 16, 2022 |
| Smith Hunter C | CFO | SELL | $1K–$15K | 833 | $6.10 | Feb 16, 2022 |
| Smith Hunter C | CFO | EXERCISE | N/A | 2K | — | Feb 16, 2022 |
| Mazabraud Yann | EVP | SELL | $1K–$15K | 934 | $6.10 | Feb 16, 2022 |
| Mazabraud Yann | EVP | EXERCISE | N/A | 2K | — | Feb 16, 2022 |
Institutional Ownership
13F filings as of Dec 31, 2025 · 217 funds holding
| Fund | Shares | Value | Type |
|---|---|---|---|
| RA CAPITAL MANAGEMENT, L.P. | 6.7M | $1M+ | SH |
| VANGUARD GROUP INC | 5.7M | $1M+ | SH |
| PRIMECAP MANAGEMENT CO/CA/ | 3.5M | $1M+ | SH |
| NEA Management Company, LLC | 2.9M | $1M+ | SH |
| PERCEPTIVE ADVISORS LLC | 2.5M | $1M+ | SH |
| STATE STREET CORP | 2.2M | $1M+ | SH |
| WESTFIELD CAPITAL MANAGEMENT CO LP | 1.3M | $1M+ | SH |
| GEODE CAPITAL MANAGEMENT, LLC | 1.2M | $1M+ | SH |
| Capital Research Global Investors | 985K | $1M+ | SH |
| ALLIANCEBERNSTEIN L.P. | 930K | $1M+ | SH |
| JENNISON ASSOCIATES LLC | 790K | $1M+ | SH |
| Pictet Asset Management Holding SA | 615K | $1M+ | SH |
| LORD, ABBETT & CO. LLC | 610K | $1M+ | SH |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 532K | $1M+ | SH |
| Clearbridge Investments, LLC | 506K | $1M+ | SH |
| Siren, L.L.C. | 500K | $1M+ | SH |
| Point72 Asset Management, L.P. | 429K | $1M+ | SH |
| LOOMIS SAYLES & CO L P | 411K | $1M+ | SH |
| MORGAN STANLEY | 353K | $1M+ | SH |
| RENAISSANCE TECHNOLOGIES LLC | 341K | $1M+ | SH |
Activist & 5%+ Owners
SC 13D/13G filings — investors holding 5%+ of outstanding shares
SC 13G/A · Feb 17, 2026
9.9%
6.7M shares
SC 13G/A · Feb 12, 2026
5.2%
3.5M shares
SC 13G/A · Jan 30, 2026
9.3%
6.2M shares
SC 13G/A · Nov 14, 2025
6.4%
4.3M shares
SC 13G/A · Oct 30, 2025
7.5%
5.0M shares
SC 13G/A · Aug 14, 2025
8.7%
5.6M shares
SC 13G/A · Aug 14, 2025
7.7%
4.9M shares
SC 13G/A · May 15, 2025
6.8%
4.4M shares
SC 13G/A · May 15, 2025
8.9%
5.6M shares
SC 13G/A · May 13, 2025
9.2%
5.8M shares
SC 13G/A · Apr 24, 2025
6.9%
4.4M shares
SC 13G/A · Feb 13, 2025
10.7%
6.6M shares
SC 13G/A · Feb 10, 2025
3.0%
1.8M shares
SC 13G · Nov 15, 2024
8.6%
5.4M shares
SC 13G/A · Nov 14, 2024
9.9%
6.1M shares
SC 13G/A · Nov 12, 2024
6.4%
3.9M shares
PRIMECAP Management Company 95-3868081
SC 13G/A · Nov 12, 2024
11.8%
7.2M shares
SC 13D/A · Apr 17, 2024
514.4M shares
SC 13D/A · Apr 3, 2024
326.9M shares
SC 13D · Mar 20, 2024
326.9M shares
SC 13G/A · Feb 14, 2024
9.0%
5.3M shares
SC 13G/A · Feb 14, 2024
10.8%
6.4M shares
The Vanguard Group - 23-1945930
SC 13G · Feb 13, 2024
5.5%
3.2M shares
SC 13G · Feb 12, 2024
5.5%
3.3M shares
PRIMECAP Management Company 95-3868081
SC 13G/A · Feb 12, 2024
13.6%
8.1M shares
SC 13G/A · Jan 24, 2024
10.7%
6.4M shares
STATE STREET CORPORATION I.R.S. IDENTIFICATION NO. OF THE ABOVE PERSON 04-2456637
SC 13G/A · Jan 23, 2024
3.7%
0 shares
SC 13G/A · Sep 7, 2023
4.1%
2.3M shares
SC 13G/A · Jul 7, 2023
11.0%
6.3M shares
New Enterprise Associates 13, L.P.
SC 13D/A · Mar 28, 2023
5.1%
2.9M shares
SC 13G/A · Feb 14, 2023
9.8%
5.5M shares
SC 13G/A · Feb 14, 2023
11.3%
6.4M shares
PRIMECAP Management Company 95-3868081
SC 13G/A · Feb 9, 2023
12.3%
6.9M shares
STATE STREET CORPORATION I.R.S. IDENTIFICATION NO. OF THE ABOVE PERSON 04-2456637
SC 13G · Feb 3, 2023
5.6%
0 shares
SC 13G · Feb 3, 2023
6.6%
3.7M shares
SC 13G/A · Feb 1, 2023
11.2%
6.3M shares
SC 13G/A · Oct 7, 2022
10.9%
6.1M shares
SC 13G · Jul 8, 2022
2.3%
1.2M shares
(entities only Federated Hermes, Inc.
SC 13G/A · Apr 11, 2022
10.1%
5.1M shares
SC 13G/A · Feb 14, 2022
7.7%
3.9M shares
SC 13G/A · Feb 14, 2022
9.7%
4.9M shares
(entities only Federated Hermes, Inc.
SC 13G/A · Feb 14, 2022
5.6%
2.8M shares
SC 13G/A · Feb 11, 2022
3.1%
1.6M shares
Janus Henderson Group plc EIN #00-0000000
SC 13G/A · Feb 10, 2022
6.2%
3.1M shares
PRIMECAP Management Company 95-3868081
SC 13G/A · Feb 10, 2022
12.4%
6.3M shares
SC 13G · Jan 24, 2022
6.1%
3.1M shares