---
schema_version: "secwatch.filing_event.v1"
accession: "0000950170-24-040345"
form_type: "8-K"
ticker: "STRO"
cik: "0001382101"
company_name: "SUTRO BIOPHARMA, INC."
filed_at: "2024-04-02T23:59:59+00:00"
generated_at: "2026-06-04T03:25:25.821372+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# Sutro Biopharma launches $75M common stock offering at $5.18/share

## Summary
- 14,478,764 shares offered at $5.18/share; gross proceeds ~$75M.
- Underwriting agreement with BofA Securities; closing expected April 4, 2024.
- Net proceeds for general corporate purposes including R&D and working capital.
- Offering is dilutive to existing shareholders; trading symbol STRO on Nasdaq.

## SEC filing metadata
- accession: 0000950170-24-040345
- form_type: 8-K
- ticker: STRO
- cik: 0001382101
- company_name: SUTRO BIOPHARMA, INC.
- filed_at: 2024-04-02T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: high
- sec_items: 1.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1382101/000095017024040345/0000950170-24-040345-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1382101/000095017024040345/stro-20240402.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000950170-24-040345
- JSON: https://secwatch.observer/filing/0000950170-24-040345.json
- Plain text: https://secwatch.observer/filing/0000950170-24-040345.txt

## Key facts
- Material Agreements
  SUTRO BIOPHARMA, INC. entered into Underwriting Agreement with BofA Securities, Inc. (effective 2024-04-02).
  - Action: entry
  - Agreement: underwriting
  - Counterparty: BofA Securities, Inc.
  - Effective: 2024-04-02
  source text: On April 2, 2024, Sutro Biopharma, Inc. (the “Company”) entered into an underwriting agreement (the “Underwriting Agreement”) with BofA Securities, Inc., as representative of the several underwriters named therein (the “Underwriter”), pursuant to which the Company agreed to issue and sell 14,478,764 shares of its common stock (the “Shares”) to the Underwriter (the “Offering”).
  evidence_url: https://www.sec.gov/Archives/edgar/data/1382101/000095017024040345/0000950170-24-040345-index.htm

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