UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 8, 2026 Personalis, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 001-38943 27-5411038 (State or Other Jurisdiction of Incorporation) 6600 Dumbarton Circle Fremont, California 94555 (Address of Principal Executive Offices) (Zip Code) (Commission File Number) (IRS ...