Personalis to Announce Second Quarter Financial Results on August 4, 2021

Personalis, Inc. PSNL, a leader in advanced genomics for cancer, announced today it will release its second quarter 2021 financial results after the market closes on Wednesday, August 4, 2021. In conjunction with the release, the Company will host a conference call and webcast that day at 2:00 p.m. Pacific Time / 5:00 p.m. Eastern Time to discuss its financial results and recent highlights.

Interested parties may access the live call via telephone by dialing (866) 220-8061 for domestic callers or (470) 495-9168 for international callers, using conference ID: 8564509. The live webinar of the call may be accessed by visiting the Events section of the company's website at investors.personalis.com. A replay of the webinar will be available shortly after the conclusion of the call and will be archived on the company's website.

About Personalis, Inc.

Personalis, Inc. is a leader in population sequencing and cancer genomics, with a focus on data, scale, efficiency, and quality. Personalis operates one of the largest sequencing operations globally and is currently the sole sequencing provider to the VA MVP. In oncology, Personalis is transforming the development of next-generation therapies by providing more comprehensive molecular data about each patient's cancer and immune response. The Personalis® ImmunoID NeXT Platform is designed to adapt to the complex and evolving understanding of cancer, providing its biopharmaceutical customers with information on all of the approximately 20,000 human genes, together with the immune system, from a single tissue and matched blood sample. The Personalis Clinical Laboratory is GxP aligned as well as CLIA'88-certified and CAP-accredited. For more information, please visit www.personalis.com and follow Personalis on Twitter (@PersonalisInc).

Forward-Looking Statements

All statements in this press release that are not historical are "forward-looking statements" within the meaning of U.S. securities laws, including statements relating to attributes or advantages of the Personalis NeXT Platform, Personalis' business opportunities, leadership, plans, vision or growth, or other future events. Such forward-looking statements involve risks and uncertainties, including those related to the COVID-19 pandemic, that could cause actual results to differ materially from any anticipated results or expectations expressed or implied by such statements. Factors that could materially affect actual results can be found in Personalis' filings with the U.S. Securities and Exchange Commission, including Personalis' most recent reports on Forms 8-K, 10-K and 10-Q, and include those listed under the caption "Risk Factors." Personalis disclaims any obligation to update such forward-looking statements.

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