Rhythm Pharmaceuticals, Inc. (RYTM)
Nasdaq: RYTM · Pharmaceutical Preparations · Boston, MA · filing with the SEC since 2015
Who owns Rhythm Pharmaceuticals, Inc.
As filed with the SECHolders of 5% or more
7
RA Capital Management, L.P. holds 9.9% of Common Stock, $0.001 par value per share, as its SCHEDULE 13G/A filed Feb 17, 2026 says.
Directors and officers
16
report now, of 28 people on the record since 2017. Their holdings as a group are not read here.
Institutions as a whole
n/a
The record does not read the share held by managers that file Form 13F, so none is printed and no split of the rest is estimated. What it holds is the 7 named at left.
Holders of 5% or moreshare of the class, as filed
RA Capital Management, L.P.
SCHEDULE 13G/A · filed Feb 17, 2026 · Common Stock, $0.001 par value per share · 8.7% in Aug 14, 2025
Baker Bros. Advisors LP
SCHEDULE 13G/A · filed May 15, 2025 · Common Stock, par value $0.001 per share
Blackrock, Inc.
SCHEDULE 13G/A · filed Apr 24, 2025 · Common Stock
Primecap Management Co/ca/
SCHEDULE 13G/A · filed Feb 12, 2026 · COM · 6.42% in Nov 14, 2025
JPMorgan Chase & Co.
SCHEDULE 13G · filed Oct 13, 2026 · Common Stock, $0.001 par value per share
Perceptive Advisors LLC
SCHEDULE 13G/A · filed May 15, 2026 · Common Stock, $0.001 par value per share · 6.8% in May 15, 2025
Vanguard Capital Management
SCHEDULE 13G · filed Apr 30, 2026 · Common Stock
Goldman Sachs Group Inc.
SCHEDULE 13G/A · filed Feb 10, 2025 · Common Stock, $0.001 par value per share · reported falling below 5%
The Vanguard Group
SCHEDULE 13G/A · filed Mar 27, 2026 · Common Stock · reported falling below 5%, from 9.3% in Jan 30, 2026
What RYTM reports owning in othersstakes of 5% or more, and other ties
11 subsidiaries in 10 countries, from the list filed with the 10-K filed Feb 26, 2026.
Insider tradesForm 4
55sales
0purchases
53sales on a scheduled plan
9people selling
$41.7Msold, in dollars
$0bought, in dollars
Open-market trades on Form 4 from Sep 30, 2025 to Sep 30, 2026. A scheduled plan is a selling program set in advance under SEC rule 10b5-1. The trades are listed as filed and do not feed the grade.
By calendar yearSoldBought
2026 runs to Sep 30, 2026. Dollars as filed, summed by the transaction date.
People who traded in the window9 of 48 on the roster
| Person | Role as filed | Sales | Sold | On a plan | Buys | Bought |
|---|---|---|---|---|---|---|
| Chien Jennifer | EVP, Head of North America | 1 | $8.9M | 1 | 0 | $0 |
| Smith Hunter C | Chief Financial Officer | 26 | $8.8M | 26 | 0 | $0 |
| Mazabraud Yann | EVP, Head of International | 6 | $6.6M | 6 | 0 | $0 |
| Meeker David P | President and CEO | 5 | $5.1M | 5 | 0 | $0 |
| Shulman Joseph | Chief Technical Officer | 6 | $3.7M | 6 | 0 | $0 |
| Tetrault Lynn A. | director | 1 | $3.7M | 1 | 0 | $0 |
| Cramer Pamela J. | Chief Human Resources Officer | 4 | $3.0M | 4 | 0 | $0 |
| Garfield Alastair | Chief Scientific Officer | 4 | $900,000 | 4 | 0 | $0 |
| German Christopher Paul | Corporate Controller & CAO | 2 | $900,000 | 0 | 0 | $0 |