---
schema_version: "secwatch.filing_event.v1"
accession: "0001564590-21-057374"
form_type: "8-K"
ticker: "STRO"
cik: "0001382101"
company_name: "SUTRO BIOPHARMA, INC."
filed_at: "2021-11-17T23:59:59+00:00"
generated_at: "2026-06-28T07:19:13.296526+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.2
calibrated_materiality_score: 0.2
confidence: "high"
source: SEC EDGAR
---

# Sutro Biopharma appoints Heidi Hunter as Class I director, effective Nov 19, 2021

## Summary
- Heidi Hunter appointed Class I director and member of Audit and Science & Technology Committees.
- Receives pro rata annual retainers: $40K director, $10K audit, $5K science/tech.
- Granted option for 24,000 shares vesting monthly over three years; 9,884 shares vesting until 2022 annual meeting.
- Exercise price equals closing price on Nov 19, 2021.

## SEC filing metadata
- accession: 0001564590-21-057374
- form_type: 8-K
- ticker: STRO
- cik: 0001382101
- company_name: SUTRO BIOPHARMA, INC.
- filed_at: 2021-11-17T23:59:59+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.2
- calibrated_materiality_score: 0.2
- confidence: high
- sec_items: 5.02
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1382101/000156459021057374/0001564590-21-057374-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1382101/000156459021057374/stro-8k_20211112.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001564590-21-057374
- JSON: https://secwatch.observer/filing/0001564590-21-057374.json
- Plain text: https://secwatch.observer/filing/0001564590-21-057374.txt

## Key facts
- Executive change
  Heidi Hunter was appointed as Class I director at SUTRO BIOPHARMA, INC..
  - Action: appointed
  - Role: Class I director
  source text: On November 12, 2021, the board of directors (the “ Board ”) of Sutro Biopharma, Inc. (the “ Company ”) appointed Heidi Hunter, as a Class I director and member of the Audit Committee and Science and Technology Committee, effective as of November 19, 2021.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1382101/000156459021057374/0001564590-21-057374-index.htm

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