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  4. [Form 4] RHYTHM PHARMACEUTICALS, INC. Insider Trading Activity

RHYTHM (RYTM) director receives 6,808 RSUs and 10,257 stock options

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

Rhea-AI Filing Summary

RHYTHM PHARMACEUTICALS, INC. director Kimberly J. Popovits received equity-based compensation on April 1, 2026. She was granted 6,808 Restricted Stock Units, each representing a right to receive one share of common stock.

The RSUs vest in three equal installments of 33% on April 1, 2027, April 1, 2028, and April 1, 2029, provided she continues in service. She was also granted 10,257 stock options with an exercise price of $88.12 per share, vesting in three substantially equal annual installments and expiring on March 31, 2036.

Positive

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Insider Popovits Kimberly J
Role Director
Type Security Shares Price Value
Grant/Award Restricted Stock Units 6,808 $0.00 --
Grant/Award Stock Options (Right to Buy) 10,257 $0.00 --
Holdings After Transaction: Restricted Stock Units — 6,808 shares (Direct); Stock Options (Right to Buy) — 10,257 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 will vest as to 33% of the total shares on each of April 1, 2027, April 1, 2028, April 1, 2029. The restricted stock units have no expiration date. The stock options were granted on April 1, 2026. The options vest and become exercisable in three substantially equal annual installments subject to the Reporting Person continuing in service through each such vesting date.
Restricted Stock Units granted 6,808 units Awarded on April 1, 2026; vest in three 33% tranches 2027–2029
Stock options granted 10,257 options Granted April 1, 2026 as director equity compensation
Option exercise price $88.12 per share Strike price for 10,257 stock options
Options expiration date March 31, 2036 Final exercise date for granted stock options
RSU holdings after grant 6,808 RSUs Total RSUs directly held following April 1, 2026 transaction
Option holdings after grant 10,257 options Total stock options directly held following April 1, 2026 grant
Restricted Stock Units financial
"Each restricted stock unit represents a contingent right to receive one share of Issuer common stock."
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.
stock options financial
"The stock options were granted on April 1, 2026."
Stock options are agreements that give a person the right to buy or sell a company's stock at a specific price within a certain time frame. They are often used as a reward or incentive, similar to a coupon that can be used later if the stock price rises, allowing the holder to make a profit.
vest financial
"The restricted stock units will vest as to 33% of the total shares on each of April 1, 2027, April 1, 2028, April 1, 2029."
A vest is the process by which an employee earns the right to receive certain benefits or ownership interests, such as stock or retirement funds, over time. It’s similar to earning a reward gradually, ensuring that the benefit becomes fully yours only after a set period or meeting specific conditions. This makes it important for investors because it determines when they can actually claim or use those benefits.
exercise price financial
"conversion_or_exercise_price": "88.1200""
The exercise price is the fixed amount at which you can buy or sell an asset, like a stock, when using an options contract. It matters because it helps determine whether exercising the option will be profitable or not, depending on the current market price. Think of it as the set price you agree on today to buy or sell later.
expiration date financial
"expiration_date": "2036-03-31T00:00:00.000Z""
The expiration date is the deadline after which a financial contract, such as an option or a futures agreement, is no longer valid or can be exercised. It matters to investors because it determines the timeframe during which they can take action or benefit from the contract, similar to how a coupon or a food item has a limited period of usefulness. Once the expiration date passes, the contract loses its value or ability to be used.
Form 4 Insider Transactions: What Each Field Means →
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*
Popovits Kimberly J
(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)
XDirector10% Owner
Officer (give title below)Other (specify below)
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
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)04/01/2026A6,808 (2) (2)Common Stock6,808$06,808D
Stock Options (Right to Buy)$88.1204/01/2026A10,257 (3)03/31/2036Common Stock10,257$010,257D
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 will vest as to 33% of the total shares on each of April 1, 2027, April 1, 2028, April 1, 2029. The restricted stock units have no expiration date.
3. The stock options were granted on April 1, 2026. The options vest and become exercisable in three substantially equal annual installments subject to the Reporting Person continuing in service through each such vesting date.
/s/ Stephen Vander Stoep, attorney-in-fact for Kimberly J. Popovits04/03/2026
** 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)

Source: View Original Filing on SEC EDGAR

FAQ

What did Kimberly J. Popovits receive in this RYTM Form 4 filing?

Kimberly J. Popovits received equity compensation consisting of 6,808 Restricted Stock Units and 10,257 stock options. These awards give her potential future ownership of RHYTHM PHARMACEUTICALS common stock, subject to vesting conditions and continued service on the company’s board.

How do the 6,808 Restricted Stock Units for RYTM vest?

The 6,808 Restricted Stock Units vest in three installments of 33% each on April 1, 2027, April 1, 2028, and April 1, 2029. Vesting requires Kimberly J. Popovits to continue in service through each stated vesting date.

What are the key terms of the 10,257 RYTM stock options granted?

Kimberly J. Popovits was granted 10,257 stock options with an exercise price of $88.12 per share. These options vest in three substantially equal annual installments and expire on March 31, 2036, contingent on her continued service with the company.

Does this RYTM Form 4 show open-market buying or selling?

No open-market buying or selling appears; the filing reports equity awards. The transactions are coded as grants (code A), reflecting compensation-related acquisitions of Restricted Stock Units and stock options, rather than discretionary market purchases or sales of existing RHYTHM PHARMACEUTICALS shares.

How many RHYTHM PHARMACEUTICALS RSUs does Kimberly Popovits hold after this grant?

After the transaction, Kimberly J. Popovits holds 6,808 Restricted Stock Units directly, according to the Form 4. Each unit represents a contingent right to receive one share of RHYTHM PHARMACEUTICALS common stock once the applicable vesting conditions are satisfied.

What is the significance of the March 31, 2036 expiration date for RYTM options?

The March 31, 2036 expiration date marks the last day the 10,257 stock options can be exercised at $88.12 per share. After that date, any unexercised options lapse, so value realization depends on future stock price and vesting completion.