---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-23-165284"
form_type: "8-K"
ticker: "ZYME"
cik: "0001937653"
company_name: "Zymeworks Inc."
filed_at: "2023-06-12T23:59:59+00:00"
generated_at: "2026-06-14T03:19:50.448750+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.25
calibrated_materiality_score: 0.25
confidence: "high"
source: SEC EDGAR
---

# Zymeworks terminates shareholder rights plan; eliminates Series B Preferred Stock

## Summary
- Preferred stock purchase rights under Rights Agreement expired on June 8, 2023, terminating the plan.
- Certificate of Elimination filed June 12, 2023 eliminates Series B Participating Preferred Stock.
- Series B Preferred shares revert to authorized but unissued preferred stock.

## SEC filing metadata
- accession: 0001193125-23-165284
- form_type: 8-K
- ticker: ZYME
- cik: 0001937653
- company_name: Zymeworks Inc.
- filed_at: 2023-06-12T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.25
- calibrated_materiality_score: 0.25
- confidence: high
- sec_items: 3.03, 5.03, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1937653/000119312523165284/0001193125-23-165284-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1937653/000119312523165284/d505663d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-23-165284
- JSON: https://secwatch.observer/filing/0001193125-23-165284.json
- Plain text: https://secwatch.observer/filing/0001193125-23-165284.txt

## Key facts
- Governance Changes
  Zymeworks Inc.: The Company filed a Certificate of Elimination to eliminate its Series B Participating Preferred Stock, effective upon filing on June 12, 2023, following the termination of the Rights Agreement (effective 2023-06-12).
  - Change: charter amendment
  - Effective: 2023-06-12
  source text: the Company filed a Certificate of Elimination with the Secretary of State of the State of Delaware on June 12, 2023, which, effective upon filing, eliminated the Company’s Series B Participating Preferred Stock, par value $0.00001 per share (the “Series B Preferred Stock”).
  evidence_url: https://www.sec.gov/Archives/edgar/data/1937653/000119312523165284/0001193125-23-165284-index.htm

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