---
schema_version: "secwatch.filing_event.v1"
accession: "0001641172-25-015067"
form_type: "8-K"
ticker: null
cik: "0001811623"
company_name: "PaxMedica, Inc."
filed_at: "2025-06-13T23:59:59+00:00"
generated_at: "2026-05-19T08:52:50.685853+00:00"
event_type: "other_material"
sentiment: "negative"
materiality_score: 1.0
calibrated_materiality_score: 1.0
confidence: "high"
source: SEC EDGAR
---

# PaxMedica cancels all outstanding shares, deregisters with SEC

## Summary
- Company changed name to Kuvatris Therapeutics; all outstanding shares declared null, void, and worthless.
- Shares held by DTC and record shareholders ordered cancelled; beneficial shareholders left with worthless equity.
- Company to file Form 15-12g terminating SEC registration, ending all reporting obligations under Exchange Act.
- CEO Howard Weisman executed name change on June 6, 2025; share cancellation letter sent to DTC on May 20.

## SEC filing metadata
- accession: 0001641172-25-015067
- form_type: 8-K
- cik: 0001811623
- company_name: PaxMedica, Inc.
- filed_at: 2025-06-13T23:59:59+00:00
- event_type: other_material
- sentiment: negative
- materiality_score: 1.0
- calibrated_materiality_score: 1.0
- confidence: high
- sec_items: 5.03, 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1811623/000164117225015067/0001641172-25-015067-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1811623/000164117225015067/form8-k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001641172-25-015067
- JSON: https://secwatch.observer/filing/0001641172-25-015067.json
- Plain text: https://secwatch.observer/filing/0001641172-25-015067.txt

## Key facts
- Governance Changes
  PaxMedica, Inc.: Certificate of amendment changing company name from PaxMedica, Inc. to Kuvatris Therapeutics, Inc (effective 2025-06-06).
  - Change: charter amendment
  - Effective: 2025-06-06
  source text: On June 6, 2025, Howard J. Weisman, chief executive officer of PaxMedica, Inc., a Delaware corporation (the “Company”), executed a certificate of amendment of the certificate of incorporation of the Company, changing the Company’s name from PaxMedica, Inc. to Kuvatris Therapeutics, Inc.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1811623/000164117225015067/0001641172-25-015067-index.htm

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