---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-25-001488"
form_type: "8-K"
ticker: null
cik: "0001656634"
company_name: "Gritstone bio, Inc."
filed_at: "2025-01-03T23:59:59+00:00"
generated_at: "2026-05-28T14:33:54.825260+00:00"
event_type: "m_and_a"
sentiment: "negative"
materiality_score: 0.9
calibrated_materiality_score: 0.9
confidence: "high"
source: SEC EDGAR
---

# Gritstone bio sells assets for $21.25M to Seattle Project Corp. in Ch11; CEO and top officers resign

## Summary
- Sold substantially all assets (excl. machinery, Binder IP) to Seattle Project Corp. for $21.25M cash at closing.
- Effective Dec 31, 2024: CEO Andrew Allen, CBO Matthew Hawryluk, COO Erin Jones, R&D head Karin Jooss resigned without cause.
- Celia Economides named interim CEO and CFO effective Dec 31, 2024; no change in compensation.
- Bankruptcy Court approved sale on Dec 23, 2024; closing occurred Dec 30, 2024.
- Company cautions that trading in common stock (GRTSQ) is highly speculative due to Chapter 11 Case.

## SEC filing metadata
- accession: 0001193125-25-001488
- form_type: 8-K
- cik: 0001656634
- company_name: Gritstone bio, Inc.
- filed_at: 2025-01-03T23:59:59+00:00
- event_type: m_and_a
- sentiment: negative
- materiality_score: 0.9
- calibrated_materiality_score: 0.9
- confidence: high
- sec_items: 1.01, 2.01, 1.03, 5.02, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1656634/000119312525001488/0001193125-25-001488-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1656634/000119312525001488/d905705d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-25-001488
- JSON: https://secwatch.observer/filing/0001193125-25-001488.json
- Plain text: https://secwatch.observer/filing/0001193125-25-001488.txt

## Key facts
- Executive change
  Matthew Hawryluk resigned as Executive Vice President and Chief Business Officer at Gritstone bio, Inc..
  - Action: resigned
  - Role: Executive Vice President and Chief Business Officer
  source text: Matthew Hawryluk, Ph.D., Executive Vice President and Chief Business Officer
  evidence_url: https://www.sec.gov/Archives/edgar/data/1656634/000119312525001488/0001193125-25-001488-index.htm
- Executive change
  Vassiliki "Celia" Economides was appointed as interim Chief Executive Officer and Chief Financial Officer at Gritstone bio, Inc..
  - Action: appointed
  - Role: interim Chief Executive Officer and Chief Financial Officer
  source text: Also effective December 31, 2024 and following the closing of the Asset Sale, Vassiliki “Celia” Economides became interim Chief Executive Officer of the Company as well as Chief Financial Officer of the Company.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1656634/000119312525001488/0001193125-25-001488-index.htm
- Executive change
  Karin Jooss resigned as Executive Vice President and Head of Research and Development at Gritstone bio, Inc..
  - Action: resigned
  - Role: Executive Vice President and Head of Research and Development
  source text: Karin Jooss, Ph.D., Executive Vice President and Head of Research and Development
  evidence_url: https://www.sec.gov/Archives/edgar/data/1656634/000119312525001488/0001193125-25-001488-index.htm
- Executive change
  Erin E. Jones resigned as Executive Vice President and Chief Operating Officer at Gritstone bio, Inc..
  - Action: resigned
  - Role: Executive Vice President and Chief Operating Officer
  source text: Erin E. Jones, Executive Vice President and Chief Operating Officer
  evidence_url: https://www.sec.gov/Archives/edgar/data/1656634/000119312525001488/0001193125-25-001488-index.htm
- Executive change
  Andrew Allen resigned as President and Chief Executive Officer at Gritstone bio, Inc..
  - Action: resigned
  - Role: President and Chief Executive Officer
  source text: Andrew Allen, M.D., Ph.D., President and Chief Executive Officer
  evidence_url: https://www.sec.gov/Archives/edgar/data/1656634/000119312525001488/0001193125-25-001488-index.htm
- M&A Transactions
  Gritstone bio, Inc. completed a disposition involving Seattle Project Corp. for $21,250,000 in cash (closed 2024-12-30).
  - Action: disposition
  - Counterparty: Seattle Project Corp.
  - Consideration: $21,250,000 in cash
  - Closing: 2024-12-30
  source text: property assets generally known as “Binder IP,” and certain other specifically identified excluded assets) (the “ Company Assets ,” and such sale, the “ Asset Sale ”) for $21,250,000 in cash at the closing of the Asset Sale. On December 30, 2024, the Company and the Bidders closed the Asset Sale contemplated by the APA, thereby completing the disposition of
  evidence_url: https://www.sec.gov/Archives/edgar/data/1656634/000119312525001488/0001193125-25-001488-index.htm

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