---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-26-415547"
form_type: "8-K"
ticker: "PSNL"
cik: "0001527753"
company_name: "Personalis, Inc."
filed_at: "2026-10-06T20:05:33+00:00"
generated_at: "2026-10-12T16:21:48.218879+00:00"
event_type: "m_and_a"
sentiment: "neutral"
materiality_score: 0.5
calibrated_materiality_score: 0.5
confidence: "high"
source: SEC EDGAR
---

# Personalis-Tempus merger clears HSR antitrust hurdle; waiting period expired Oct 2, 2026

## Summary
- HSR waiting period for Tempus AI's acquisition of Personalis expired at 11:59 p.m. Eastern time on October 2, 2026; Tempus refiled its notification Sept 2, 2026 after withdrawing Aug 31.
- Two-step structure: Merger Sub I merges into Personalis (Personalis survives), then Personalis merges into Merger Sub II, surviving as a wholly owned Tempus subsidiary; agreement signed July 20, 2026.
- Tempus filed Amendment No. 1 to its Form S-4 registration statement and to the Schedule 13E-3 on October 2, 2026; the initial S-4 and 13E-3 were filed August 31, 2026.
- Closing still requires Personalis stockholder approval of the Merger Agreement plus other customary conditions; the virtual stockholders meeting date has not yet been set.
- Tempering the news: Personalis' only stated timeline is that the meeting will be held on a date 'to be determined and announced.'

## SEC filing metadata
- accession: 0001193125-26-415547
- form_type: 8-K
- ticker: PSNL
- cik: 0001527753
- company_name: Personalis, Inc.
- filed_at: 2026-10-06T20:05:33+00:00
- event_type: m_and_a
- sentiment: neutral
- materiality_score: 0.5
- calibrated_materiality_score: 0.5
- confidence: high
- sec_items: 8.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1527753/000119312526415547/0001193125-26-415547-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1527753/000119312526415547/d155320d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-26-415547
- JSON: https://secwatch.observer/filing/0001193125-26-415547.json
- Plain text: https://secwatch.observer/filing/0001193125-26-415547.txt

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