---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-23-088185"
form_type: "8-K"
ticker: "DNTH"
cik: "0001690585"
company_name: "Dianthus Therapeutics, Inc. /DE/"
filed_at: "2023-03-31T23:59:59+00:00"
generated_at: "2026-06-17T08:00:53.908710+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# Magenta Therapeutics adopts one-year stockholder rights plan to support strategic review

## Summary
- Rights plan triggers at 10% beneficial ownership; each right entitles holder to purchase preferred stock units at $3.75.
- Plan expires March 30, 2024; includes qualifying offer clause allowing 10% of stockholders to call special meeting.
- Board previously announced comprehensive strategic review to maximize shareholder value; rights plan provides time for review.
- No dead-hand, slow-hand, or similar features; Board can redeem rights for $0.001 per right until trigger.

## SEC filing metadata
- accession: 0001193125-23-088185
- form_type: 8-K
- ticker: DNTH
- cik: 0001690585
- company_name: Dianthus Therapeutics, Inc. /DE/
- filed_at: 2023-03-31T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: high
- sec_items: 1.01, 3.03, 5.03, 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1690585/000119312523088185/0001193125-23-088185-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1690585/000119312523088185/d436260d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-23-088185
- JSON: https://secwatch.observer/filing/0001193125-23-088185.json
- Plain text: https://secwatch.observer/filing/0001193125-23-088185.txt

## Key facts
- Governance Changes
  Dianthus Therapeutics, Inc. /DE/: The Board approved a Certificate of Designations to create a new series of preferred stock, Series A Junior Participating Cumulative Preferred Stock, in connection with the adoption of a Rights Agreement (effective 2023-03-31).
  - Change: charter amendment
  - Effective: 2023-03-31
  source text: In connection with the adoption of the Rights Agreement described in Item 1.01 above, the Board of Directors of the Company approved a Certificate of Designations of Series A Junior Participating Cumulative Preferred Stock (the “Certificate of Designations”). The Certificate of Designations will be filed with the Secretary of State of Delaware on March 31, 2023.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1690585/000119312523088185/0001193125-23-088185-index.htm

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