Rhythm Pharmaceuticals (RYTM) director Kimberly Popovits files initial Form 3

Rhea-AI Filing Summary

RHYTHM PHARMACEUTICALS, INC. director Kimberly J. Popovits has filed an initial Form 3, which is a statement of beneficial ownership for insiders. This filing lists her as a director of the company but does not report any stock transactions or derivative positions.

Key Terms

Form 3, reporting person, beneficial ownership

3 terms

Form 3 regulatory

"INSIDER FILING DATA (Form 3):"

Form 3 is the initial public filing that officers, directors and large shareholders must submit to report their ownership of a company’s securities when they become insiders. It acts like an opening inventory sheet that gives investors a starting point to see who holds significant stakes and to spot later trades or potential conflicts of interest, helping assess insider confidence and transparency.

reporting person regulatory

""reportingPersons": [ { "name": "Popovits Kimberly J" } ]"

beneficial ownership financial

"initial statement of beneficial ownership for insiders"

Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.

Understanding Insider Trading Forms →

SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

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:			3235-0104
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hours per response:			0.5

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. Date of Event Requiring Statement (Month/Day/Year)
04/01/2026

3. Issuer Name and Ticker or Trading Symbol
RHYTHM PHARMACEUTICALS, INC. [ RYTM ]

3a. Foreign Trading Symbol

5. If Amendment, Date of Original Filed (Month/Day/Year)

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

Remarks:

Exhibit 24 - Power of Attorney.

No securities are beneficially owned.

	/s/ Stephen Vander Stoep, Attorney-in-fact for Kimberly J. Popovits	04/03/2026
	** Signature of Reporting Person	Date
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 5 (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 3: SEC 1473 (03-26)

FAQ

What does the Rhythm Pharmaceuticals (RYTM) Form 3 filing show?

The Form 3 filing shows that Kimberly J. Popovits is a director of Rhythm Pharmaceuticals. It is an initial statement of beneficial ownership and, in this case, reports no stock transactions or derivative positions for her.

Who is the reporting person in the RYTM Form 3 filing?

The reporting person is Kimberly J. Popovits, identified in the filing as a director of Rhythm Pharmaceuticals. She is not listed as an officer or 10% owner, and no other roles or relationships are disclosed in this document.

Does the Rhythm Pharmaceuticals Form 3 report any insider trades?

No insider trades are reported in this Form 3 for Rhythm Pharmaceuticals. The transactions section is empty, indicating no purchases, sales, exercises, gifts, or restructurings were disclosed for Kimberly J. Popovits in this initial ownership filing.

What does it mean that there are no transactions in the RYTM Form 3?

Having no transactions in the Form 3 means the filing only establishes insider status and beneficial ownership reporting for Kimberly J. Popovits. It records her position as a director without showing any concurrent trades or option exercises in the company’s securities.

Does the RYTM Form 3 include any derivative securities information?

The Form 3 shows no derivative securities for Kimberly J. Popovits. The derivative summary is empty, indicating there are no options, warrants, or other derivative positions reported as part of her beneficial ownership in this filing.