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

Personalis, Inc.

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.'

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