---
schema_version: "secwatch.filing_event.v1"
accession: "0000950170-23-004373"
form_type: "8-K"
ticker: "STRO"
cik: "0001382101"
company_name: "SUTRO BIOPHARMA, INC."
filed_at: "2023-02-24T23:59:59+00:00"
generated_at: "2026-06-19T00:37:42.694729+00:00"
event_type: "other"
sentiment: "neutral"
materiality_score: 0.2
calibrated_materiality_score: 0.2
confidence: "high"
source: SEC EDGAR
---

# Sutro Biopharma amends bylaws to align with SEC universal proxy rules and DGCL changes

## Summary
- Revised advance notice provisions requiring additional disclosures from proposing stockholders and nominees.
- Added requirement that stockholders using universal proxy rules certify compliance and provide evidence at least 5 business days before meeting.
- Updated adjournment procedures and list of stockholders to conform to recent DGCL amendments.
- Added emergency bylaw provision for director and officer authority during emergencies.
- Incorporated ministerial, clarifying, and conforming changes to align with DGCL and universal proxy rules.

## SEC filing metadata
- accession: 0000950170-23-004373
- form_type: 8-K
- ticker: STRO
- cik: 0001382101
- company_name: SUTRO BIOPHARMA, INC.
- filed_at: 2023-02-24T23:59:59+00:00
- event_type: other
- sentiment: neutral
- materiality_score: 0.2
- calibrated_materiality_score: 0.2
- confidence: high
- sec_items: 5.03, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1382101/000095017023004373/0000950170-23-004373-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1382101/000095017023004373/stro-20230224.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000950170-23-004373
- JSON: https://secwatch.observer/filing/0000950170-23-004373.json
- Plain text: https://secwatch.observer/filing/0000950170-23-004373.txt

## Key facts
- Governance Changes
  SUTRO BIOPHARMA, INC.: Amended and restated bylaws to conform to DGCL amendments and universal proxy rules, including updates to stockholder meeting procedures, advance notice provisions, and emergency bylaws (effective 2023-02-24).
  - Change: bylaw amendment
  - Effective: 2023-02-24
  source text: On February 24, 2023, in connection with the effectiveness of new Securities and Exchange Commission rules regarding universal proxy cards, certain recent changes to the Delaware General Corporation Law (the “ DGCL ”), and a periodic review of the restated bylaws of Sutro Biopharma, Inc. (the “ Company ”), the Company’s board of directors (the “ Board ”) approved and adopted the Company’s amended and restated bylaws (the “ Amended and Restated Bylaws ”), which became immediately effective.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1382101/000095017023004373/0000950170-23-004373-index.htm

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