Personalis Reports First Quarter 2022 Financial Results

Personalis Reports First Quarter 2022 Financial Results

MENLO PARK, Calif. - May 4, 2022 - Personalis, Inc. (Nasdaq: PSNL), a leader in advanced genomics for precision oncology, today reported financial results for the first quarter ended March 31, 2022.

First Quarter and Recent Highlights

"We continue to be confident about our oncology revenue growth in the future due to the differentiation and strength of our offerings for both biopharma and diagnostic customers," said John West, Chief Executive Officer of Personalis. "We are making significant progress on our strategic priorities as we continue to build our clinical diagnostic team and work with world-class medical institutions. In particular, over the last several months we have announced collaborations with the Mayo Clinic and UCSD Moores Cancer Center. Our goal is to revolutionize the detection and treatment of cancer and contribute to more successful outcomes for all patients."

First Quarter 2022 Financial Results

Full Year 2022 Outlook

Personalis expects the following for the full year of 2022:

Webcast and Conference Call Information

Personalis will host a conference call to discuss the first quarter 2022 financial results after market close on Wednesday, May 4, 2022 at 2:00 p.m. Pacific Time / 5:00 p.m. Eastern Time. The conference call can be accessed live over the phone by dialing (866) 220-8061 for U.S. callers or (470) 495-9168 for international callers, using the conference ID: 3187833. The live webinar can be accessed at https://investors.personalis.com.

About Personalis, Inc.

Personalis, Inc. is a leader in advanced cancer genomics, enabling the next generation of precision cancer therapies and diagnostics. The Personalis NeXT Platform is designed to adapt to the complex and evolving understanding of cancer, providing its biopharmaceutical customers and clinicians with information on all of the approximately 20,000 human genes, together with the immune system, from a single sample. To enable cancer sequencing, Personalis' Clinical Laboratory was built with a focus on clinical accuracy, quality, big data, scale, and efficiency. The laboratory is GxP-aligned as well as Clinical Laboratory Improvement Amendments of 1988-certified and College of American Pathologists-accredited. For more information, visit the Personalis website and follow Personalis on LinkedIn and Twitter.

Forward-Looking Statements

This press release contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. Actual results may differ materially from the results predicted, and reported results should not be considered an indication of future performance. Forward-looking statements include all statements that are not historical facts and can be identified by terms such as "continue to," "expect," "future," "goal," or "will" or similar expressions and the negatives of those terms. These statements include, but are not limited to, statements regarding the company's full year financial guidance, capabilities of NeXT Personal, future oncology revenue growth, goals and benefits of our collaborations, and the company's business outlook. Forward-looking statements involve known and unknown risks, uncertainties and other factors that may cause Personalis' actual results, performance or achievements to be materially different from any future results, performance or achievements expressed or implied by the forward-looking statements. These risks, uncertainties and other factors relate to, among others: the timing and pace of new orders from customers, including from Natera, which accounted for 27% of the company's total revenue in the first quarter of 2022; the launch and market adoption of new products and new product features, such as NeXT Personal; the timing of tissue, blood, and other specimen sample receipts from customers, which can materially impact revenue quarter-over-quarter and year-over-year; whether orders for the NeXT Platform and revenue from biopharmaceutical customers and Natera increase or decrease in future periods; attributes or advantages of NeXT Personal or the Personalis NeXT Platform; the expected benefits or success of Personalis' collaborations including with Mayo Clinic and University of California, San Diego; the success of the company's international expansion plans; the evolution of cancer therapies and market adoption of the company's services; and the ongoing COVID-19 pandemic, which may significantly impact the company's business and operations and the business and operations of Personalis' customers and suppliers. In addition, other potential risks and uncertainties that could cause actual results to differ from the results predicted

include, among others, those risks and uncertainties included under the captions "Risk Factors" and "Management's Discussion and Analysis of Financial Condition and Results of Operations" in Personalis' Annual Report on Form 10-K, filed with the Securities and Exchange Commission (SEC) on February 24, 2022, and in Personalis' Quarterly Report on Form 10-Q for the period ended March 31, 2022, being filed with the SEC today. All information provided in this release is as of the date of this press release, and any forward-looking statements contained herein are based on assumptions that we believe to be reasonable as of this date. Undue reliance should not be placed on the forward-looking statements in this press release, which are based on information available to us on the date hereof. Personalis undertakes no duty to update this information unless required by law.

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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (unaudited)

(in thousands, except share and per share data)

SUPPLEMENTAL REVENUE INFORMATION (unaudited)