---
schema_version: "secwatch.filing_event.v1"
accession: "0001628280-26-023606"
form_type: "8-K"
ticker: "RYTM"
cik: "0001649904"
company_name: "RHYTHM PHARMACEUTICALS, INC."
filed_at: "2026-04-03T23:59:59+00:00"
generated_at: "2026-05-15T07:37:41.707812+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.2
calibrated_materiality_score: 0.2
confidence: "high"
source: SEC EDGAR
---

# Rhythm Pharmaceuticals appoints Kim Popovits to Board; Ed Mathers resigns

## Summary
- Kimberly J. Popovits elected as Class II director effective April 1, 2026 until 2028 annual meeting.
- Edward T. Mathers resigned from Board same date; no disagreement with company cited.
- Popovits is former Chairman/CEO of Genomic Health with >40 years life sciences experience.
- Mathers served on Board since 2013; thanked for his strategic perspective and stewardship.
- Popovits will receive standard non-employee director compensation per Company's policy.

## SEC filing metadata
- accession: 0001628280-26-023606
- form_type: 8-K
- ticker: RYTM
- cik: 0001649904
- company_name: RHYTHM PHARMACEUTICALS, INC.
- filed_at: 2026-04-03T23:59:59+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.2
- calibrated_materiality_score: 0.2
- confidence: high
- sec_items: 5.02, 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1649904/000162828026023606/0001628280-26-023606-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1649904/000162828026023606/rytm-20260401.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001628280-26-023606
- JSON: https://secwatch.observer/filing/0001628280-26-023606.json
- Plain text: https://secwatch.observer/filing/0001628280-26-023606.txt

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.