Yann Mazabraud - 01 Apr 2026 Form 4 Insider Report for RHYTHM PHARMACEUTICALS, INC. (RYTM)

Reporting relationship: EVP, Head of International
Issuer ticker: RYTM
Reported as of: 01 Apr 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 03 Apr 2026, 17:36:14 UTC
Prior SEC filing: 04 Mar 2026
Source filing: View source filing
Reporting owner signature: /s/ Stephen Vander Stoep, attorney-in-fact for Yann Mazabraud

Key filing fact

Yann Mazabraud filed Form 4 for RHYTHM PHARMACEUTICALS, INC. (RYTM) on 03 Apr 2026.

Key facts

This page summarizes Yann Mazabraud's Form 4 filing for RHYTHM PHARMACEUTICALS, INC. (RYTM).
3 reported transactions and 2 derivative rows are listed below.
Accepted by SEC: 03 Apr 2026, 17:36.

Change

Previous filing in this sequence was filed on 04 Mar 2026.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001774702 Primary reporting owner

Mazabraud Yann

Relationship: EVP, Head of International
Address: 222 BERKELEY STREET, 12TH FLOOR, BOSTON
Signature: /s/ Stephen Vander Stoep, attorney-in-fact for Yann Mazabraud
Signature date: 03 Apr 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

RYTM transaction

Common Stock

Options Exercise

Transaction value
Shares: +12,875
Change %: +24%
Price
Shares after: 66,030
Date: 01 Apr 2026
Ownership: Direct
Footnotes: F1

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

RYTM transaction Derivative

Restricted Stock Units

Options Exercise

Transaction value
Shares: -10,375
Change %: -50%
Price: $0.000000^*
Shares after: 10,375
Date: 01 Apr 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 10,375
Exercise price
Footnotes: F1, F2

RYTM transaction Derivative

Restricted Stock Units

Options Exercise

Transaction value
Shares: -2,500
Change %: -33%
Price: $0.000000^*
Shares after: 5,000
Date: 01 Apr 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 2,500
Exercise price
Footnotes: F1, F3

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 3 footnotes

Footnote F1

Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

Footnote F2

The restricted stock units vest or have vested as to 25% of the total shares on each of April 14, 2024, April 14, 2025, April 1, 2026 and April 1, 2027. The restricted stock units have no expiration date.

Footnote F3

The restricted stock units vest or have vested as to 25% of the total shares on each of April 15, 2025, April 1, 2026, April 1, 2027 and April 1, 2028. The restricted stock units have no expiration date.