PERCEPTIVE ADVISORS LLC - 31 Mar 2026 SCHEDULE 13G/A Report for RHYTHM PHARMACEUTICALS, INC. Common Stock, $0.001 par value per share (RYTM)

Filing manager: PERCEPTIVE ADVISORS LLC
Reporting owner: Perceptive Advisors LLC
Security: RHYTHM PHARMACEUTICALS, INC. Common Stock, $0.001 par value per share
Beneficially owned shares: 3,519,626 shares
Class ownership: 5.1%
Symbol: RYTM
Shares outstanding: 69,012,275 shares
Form type: SCHEDULE 13G/A
Accepted by SEC: 15 May 2026, 16:00:03 UTC
Event date: 31 Mar 2026
Previous filing: 15 May 2025
SEC filing: View on sec.gov

Key filing fact

PERCEPTIVE ADVISORS LLC disclosed 5.1% ownership in RHYTHM PHARMACEUTICALS, INC. Common Stock, $0.001 par value per share (RYTM) on 31 Mar 2026.

Key facts

PERCEPTIVE ADVISORS LLC filed SCHEDULE 13G/A for RHYTHM PHARMACEUTICALS, INC. Common Stock, $0.001 par value per share (RYTM).
Disclosed ownership: 5.1%.
Date of event: 31 Mar 2026.

This page explains what this Schedule 13D/13G filing tells you before manager-level rows.
You can verify ownership claims directly against the original SEC filing.

Backed by Schedule 13D/13G

Beneficial ownership values are sourced from the original SEC Schedule 13D/13G filing.

Reporting persons

Names, ownership, voting power, signatures, titles, and CIKs as disclosed in this Schedule 13D/G filing.

Name	Ownership	Shares Owned	shared voting power	Signature	Title
Perceptive Advisors LLC	5.1%	3,519,626	3,519,626	/s/ Joseph Edelman	Joseph Edelman, Managing Member
Joseph Edelman	5.1%	3,519,626	3,519,626	/s/ Joseph Edelman	Joseph Edelman
Perceptive Life Sciences Master Fund, Ltd.	4.1%	2,790,461	2,790,461	/s/ Joseph Edelman	Joseph Edelman, Managing Member
Perceptive Capital Solutions Holdings LP	1.1%	729,165	729,165	/s/ Joseph Edelman	Joseph Edelman, Managing Member

CIK / CUSIP context first

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