.4

Consent of Morgan Stanley & Co. LLC

We hereby consent to the use in the Registration Statement (the “Registration Statement”) of Personalis, Inc. on Form S-4 and in the related joint proxy statement/prospectus and Schedule 13E-3, which is part of the Registration Statement, of our written opinion dated July 20, 2026, appearing as Annex D to such proxy statement/prospectus, and to the description of such opinion and to the references thereto and to our name contained therein under the headings “Summary Term Sheet—Opinion of Morgan Stanley & Co. LLC,” “Special Factors—Background of the Mergers,” “Special Factors—Opinion of Morgan Stanley & Co. LLC,” and “Risk Factors.” In giving the foregoing consent, we do not admit that we come within the category of persons whose consent is required under Section 7 of the Securities Act of 1933, as amended (the “Securities Act”), or the rules and regulations promulgated thereunder, nor do we admit that we are experts with respect to any part of such Registration Statement within the meaning of the term “experts” as used in the Securities Act or the rules and regulations promulgated thereunder.

 

New York, New York

August 31, 2026