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Rhythm Pharmaceuticals (RYTM) EVP converts RSUs, now holding 66,030 shares

Filing Impact
(Neutral)
Filing Sentiment
(Neutral)
Form Type
4

Rhea-AI Filing Summary

Rhythm Pharmaceuticals EVP exercises restricted stock units into shares

Executive Vice President and Head of International Yann Mazabraud exercised restricted stock units that convert into common stock of Rhythm Pharmaceuticals. On April 1, 2026, he converted 10,375 and 2,500 restricted stock units into common shares at an exercise price of $0.00 per share.

Following these derivative exercises, his direct holdings increased to 66,030 shares of common stock. Each restricted stock unit represents a contingent right to receive one share of common stock and vests in four annual installments between April 2024 and April 2028, with no expiration date stated for the units.

Positive

  • None.

Negative

  • None.
Insider Mazabraud Yann
Role EVP, Head of International
Type Security Shares Price Value
Exercise Restricted Stock Units 10,375 $0.00 --
Exercise Restricted Stock Units 2,500 $0.00 --
Exercise Common Stock 12,875 $0.00 --
Holdings After Transaction: Restricted Stock Units — 10,375 shares (Direct); Common Stock — 66,030 shares (Direct)
Footnotes (1)
  1. Each restricted stock unit represents a contingent right to receive one share of Issuer common stock. 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. 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.
RSUs exercised (grant 1) 10,375 units Restricted stock units converted on April 1, 2026
RSUs exercised (grant 2) 2,500 units Additional restricted stock units converted on April 1, 2026
Common shares acquired via exercise 12,875 shares Total underlying common stock from RSU exercises
Shares owned after transactions 66,030 shares Direct common stock holdings following Form 4 transactions
Exercise price per share $0.00 per share Price for RSU-to-common stock conversion
Restricted Stock Units financial
"Each restricted stock unit represents a contingent right to receive one share"
Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.
derivative security financial
"Transaction code M is described as exercise or conversion of derivative security"
A derivative security is a financial contract whose value comes from the price or performance of something else, such as a stock, bond, commodity, or market index. For investors it acts like an insurance policy or a wager: it can be used to protect against losses, lock in prices, or amplify gains and losses, so it can change a portfolio’s risk and potential return without owning the underlying asset directly.
contingent right financial
"Each restricted stock unit represents a contingent right to receive one share"
vesting financial
"The restricted stock units vest or have vested as to 25% of the total shares"
Vesting is the process by which you earn full ownership of something, like company stock or a retirement benefit, over time. It’s like earning the right to keep a gift piece by piece the longer you stay with a company, making sure employees stay committed before they receive all the benefits.
SEC Form 4
FORM 4UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
OMB APPROVAL
OMB Number:3235-0287
Estimated average burden
hours per response:0.5
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.
1. Name and Address of Reporting Person*
Mazabraud Yann

(Last)(First)(Middle)
222 BERKELEY STREET, 12TH FLOOR

(Street)
BOSTON MASSACHUSETTS 02116

(City)(State)(Zip)

UNITED STATES

(Country)
2. Issuer Name and Ticker or Trading Symbol
RHYTHM PHARMACEUTICALS, INC. [ RYTM ]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
Director10% Owner
XOfficer (give title below)Other (specify below)
EVP, Head of International
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
04/01/2026
6. Individual or Joint/Group Filing (Check Applicable Line)
XForm filed by One Reporting Person
Form filed by More than One Reporting Person
4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year)2A. Deemed Execution Date, if any (Month/Day/Year)3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeVAmount(A) or (D)Price
Common Stock04/01/2026M12,875A(1)66,030D
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year)3A. Deemed Execution Date, if any (Month/Day/Year)4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 6. Date Exercisable and Expiration Date (Month/Day/Year)7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Restricted Stock Units(1)04/01/2026M10,375 (2) (2)Common Stock10,375$010,375D
Restricted Stock Units(1)04/01/2026M2,500 (3) (3)Common Stock2,500$05,000D
Explanation of Responses:
1. Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.
2. 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.
3. 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.
/s/ Stephen Vander Stoep, attorney-in-fact for Yann Mazabraud04/03/2026
** Signature of Reporting PersonDate
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

FAQ

What insider transaction did Rhythm Pharmaceuticals (RYTM) report for Yann Mazabraud?

Rhythm Pharmaceuticals reported that EVP and Head of International Yann Mazabraud exercised restricted stock units into common stock. The Form 4 shows derivative exercises on April 1, 2026, increasing his directly held common shares with no open-market purchases or sales reported.

How many Rhythm Pharmaceuticals (RYTM) shares does Yann Mazabraud hold after this Form 4?

After the reported transactions, Yann Mazabraud directly holds 66,030 shares of Rhythm Pharmaceuticals common stock. This total reflects the conversion of restricted stock units into shares on April 1, 2026, as disclosed in the Form 4 filing.

What type of securities did Yann Mazabraud exercise in the Rhythm Pharmaceuticals (RYTM) Form 4?

The filing shows Yann Mazabraud exercised Restricted Stock Units, a form of equity compensation. Each unit represents a contingent right to receive one share of Rhythm Pharmaceuticals common stock, which converts into shares as vesting conditions are satisfied.

How many restricted stock units did Yann Mazabraud convert into Rhythm Pharmaceuticals (RYTM) common stock?

On April 1, 2026, Mazabraud converted 10,375 and 2,500 restricted stock units into common stock. These derivative exercises are recorded at an exercise price of $0.00 per share, reflecting equity compensation rather than an open-market purchase.

What is the vesting schedule of Yann Mazabraud’s restricted stock units at Rhythm Pharmaceuticals (RYTM)?

Footnotes explain that his restricted stock units vest in four annual installments of 25% each. One grant vests annually from April 14, 2024 through April 1, 2027, and another vests annually from April 15, 2025 through April 1, 2028, with no expiration date stated.

Does this Rhythm Pharmaceuticals (RYTM) Form 4 show any stock sales by Yann Mazabraud?

The Form 4 does not report any open-market stock sales by Yann Mazabraud. All transactions are coded as derivative exercises (code M), representing conversions of restricted stock units into common shares rather than buy or sell transactions in the market.