---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-23-071337"
form_type: "8-K"
ticker: "ZYME"
cik: "0001937653"
company_name: "Zymeworks Inc."
filed_at: "2023-03-15T23:59:59+00:00"
generated_at: "2026-06-18T02:32:34.002641+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.15
calibrated_materiality_score: 0.15
confidence: "high"
source: SEC EDGAR
---

# Zymeworks adopts amended bylaws revising stockholder nomination and proposal procedures

## Summary
- Advance notice deadline changed: if annual meeting date shifts >25 days, notice due later of 10th day after announcement or 90th day before meeting.
- Stockholder nominators must disclose intent to solicit under Rule 14a-19 and provide compliance evidence 5 business days before meeting.
- Board size increase capped at no more than 1/3 of directors in office since last annual meeting, consistent with certificate of incorporation.
- Other updates include adjournment procedures for technical failures and ministerial/clarifying changes.

## SEC filing metadata
- accession: 0001193125-23-071337
- form_type: 8-K
- ticker: ZYME
- cik: 0001937653
- company_name: Zymeworks Inc.
- filed_at: 2023-03-15T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.15
- calibrated_materiality_score: 0.15
- confidence: high
- sec_items: 5.03, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1937653/000119312523071337/0001193125-23-071337-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1937653/000119312523071337/d485013d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-23-071337
- JSON: https://secwatch.observer/filing/0001193125-23-071337.json
- Plain text: https://secwatch.observer/filing/0001193125-23-071337.txt

## Key facts
- Governance Changes
  Zymeworks Inc.: Amended and restated bylaws to revise advance notice procedures, meeting adjournment, and board size provisions (effective 2023-03-09).
  - Change: bylaw amendment
  - Effective: 2023-03-09
  source text: On March 9, 2023, the board of directors (the “Board”) of Zymeworks Inc. (the “Company”) approved and adopted amended and restated bylaws (the “Amended and Restated Bylaws”), effective immediately.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1937653/000119312523071337/0001193125-23-071337-index.htm

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