---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-23-064524"
form_type: "8-K"
ticker: "PSNL"
cik: "0001527753"
company_name: "Personalis, Inc."
filed_at: "2023-03-08T23:59:59+00:00"
generated_at: "2026-06-18T08:28:01.608210+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# Personalis appoints Christopher Hall as CEO, Aaron Tachibana as COO, Richard Chen as EVP R&D

## Summary
- Aaron Tachibana appointed COO (also CFO); $515k salary, 60% bonus, option for 450k shares vesting 36 months.
- Christopher Hall appointed CEO (also President); $550k salary, 80% bonus, option for 400k shares vesting 36 months.
- Richard Chen promoted to EVP R&D (also CMO); $500k salary, 60% bonus, option for 250k shares vesting 36 months.
- Hall appointed Class II director, term until 2024 annual meeting.
- Severance: Tachibana/Chen get 9/12 months base salary; Hall gets 12 months base on non-CIC/CIC termination.

## SEC filing metadata
- accession: 0001193125-23-064524
- form_type: 8-K
- ticker: PSNL
- cik: 0001527753
- company_name: Personalis, Inc.
- filed_at: 2023-03-08T23:59:59+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: high
- sec_items: 5.02, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1527753/000119312523064524/0001193125-23-064524-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1527753/000119312523064524/d285289d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-23-064524
- JSON: https://secwatch.observer/filing/0001193125-23-064524.json
- Plain text: https://secwatch.observer/filing/0001193125-23-064524.txt

## Key facts
- Executive change
  Aaron Tachibana was appointed as Chief Operating Officer at Personalis, Inc..
  - Action: appointed
  - Role: Chief Operating Officer
  source text: appointed (i) Aaron Tachibana as Chief Operating Officer, in addition to his role as Chief Financial Officer
  evidence_url: https://www.sec.gov/Archives/edgar/data/1527753/000119312523064524/0001193125-23-064524-index.htm
- Executive change
  Christopher Hall was appointed as Director at Personalis, Inc..
  - Action: appointed
  - Role: Director
  source text: The Board also appointed Mr. Hall as a member of the Board as a Class II director.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1527753/000119312523064524/0001193125-23-064524-index.htm

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