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Exhibit 99.1

Tempus to Acquire Personalis, More Tightly Integrating Molecular Residual Disease (MRD) into Its AI-Enabled Precision Oncology Platform

Acquisition brings together Personalis’ MRD technology with Tempus’ commercial scale, multimodal data and AI platform to advance cancer monitoring, deepen insights and accelerate growth

Expands Tempus’ reach across the cancer care continuum and accelerates access to industry-leading technology within the rapidly emerging MRD market, a $20 billion opportunity

FREMONT, Calif., July 20, 2026 — Personalis, Inc. (Nasdaq: PSNL), a leader in advanced genomics for precision oncology, today announced that it has entered into a definitive agreement to be acquired by Tempus AI, Inc. (NASDAQ: TEM), a technology company leading the adoption of AI to advance precision medicine and patient care. The acquisition will expand Tempus capabilities in minimal residual disease (MRD) and enhance its ability to support patients from diagnosis and treatment selection, to recurrence and monitoring.

Under the terms of the agreement, Personalis shareholders will receive consideration of $16.25 per share of common stock, representing a total enterprise value of $1.5 billion, net

of Tempus’ existing ownership interest.

The complementary acquisition builds on the companies’ existing partnership, established in November 2023, through which Tempus invested in Personalis and commercializes the company’s NeXT Personal® MRD test. It brings together Tempus’ multimodal data platform, AI capabilities and precision oncology portfolio with Personalis’ industry-leading tumor-informed MRD technology to expand access to longitudinal monitoring, create new opportunities to advance biomarker discovery and enhance personalized cancer care.

“MRD is a large and rapidly growing market with the potential to truly transform how cancer patients are monitored, helping clinicians make faster and more informed decisions when cancer recurs,” said Eric Lefkofsky, CEO of Tempus. “Through our existing collaboration with Personalis, we have already demonstrated the strength of combining highly sensitive MRD technology with our commercial infrastructure. With clinical adoption and reimbursement momentum building, we are collectively well positioned to capture this opportunity, which makes this acquisition particularly exciting.”

With approximately 2.1 million new cancer diagnoses expected in the U.S. this year1 and more people living longer after a cancer diagnosis, the need for long-term monitoring is critical and continues to grow. Personalis’ ultrasensitive MRD tests are uniquely positioned to support this essential need. NeXT Personal has industry-leading sensitivity for detecting small traces of circulating tumor DNA, enabling tracking of cancer treatment response, detection of residual cancer and early detection of recurrence. With Medicare coverage in three indications and additional coverage anticipated, Personalis continues to demonstrate leadership in monitoring treatment response and cancer recurrence.

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https://www.cancer.org/content/dam/cancer-org/research/cancer-facts-and-statistics/annual-cancer-facts-and-figures/2026/2026-cancer-facts-and-figures.pdf

“We believe this transaction represents an exciting next chapter for Personalis,” said Chris Hall, CEO of Personalis. “Combining with Tempus gives us the scale, complementary capabilities and resources to accelerate innovation and deliver even greater value to patients, clinicians and biopharma partners. After conducting an exhaustive process, we are confident Tempus’ offer provides the most value to our shareholders and the fastest path to bringing Personalis’ industry-leading tests to patients suffering from cancer.”

Transaction Terms

Under the terms of the agreement Tempus will acquire all outstanding shares of Personalis not already owned by Tempus at a price of $16.25 per common share, representing a 6% premium to Friday’s closing price and a 28% premium to unaffected 30-day VWAP. Consideration will be structured as a 100% stock transaction with Tempus having the option to elect payment in cash at Tempus’ discretion, capped at 50% of the consideration paid. Personalis shareholders will receive a floating exchange ratio of Tempus AI common stock for each share of Personalis common stock they own at closing, subject to a maximum exchange ratio of 0.3356, which shall be finalized closer to the closing of the transaction. Cash consideration will be financed with cash on hand and borrowings under the Company’s then existing credit facilities.

The closing is expected in late 2026 or early 2027, and is subject to Personalis’ shareholder approval, as well as receipt of applicable regulatory approvals and other customary closing conditions. The transaction was approved by both companies’ board of directors.

Personalis delivered preliminary revenue in Q2 of $22.4 million. In the quarter, they delivered 10

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Exhibit 99.1

Personalis Reports First Quarter Results and Recent Highlights Clinical test volume surged 258% year-over-year and 26% sequentially to 7,815 tests in Q1

Medicare coverage secured for lung cancer surveillance, providing a clear path to monetize rapidly growing clinical test volumes

FREMONT, Calif. – May 7, 2026 – Personalis, Inc. (Nasdaq: PSNL), a leader in advanced genomics for precision oncology, today reported financial and operational results for the first quarter ended March 31, 2026, highlighted recent business accomplishments, and reaffirmed financial guidance for the full year 2026.

First Quarter and Recent Strategic and Operational Highlights

● Secured Milestone Medicare Coverage for Lung Cancer: Received Medicare coverage approval in the first quarter for the surveillance of cancer recurrence in lung cancer patients for Stage I to III non-small cell lung cancer (NSCLC). This marks the Company's second major coverage decision in six months, alongside breast cancer.

● Announced Early Access Launch of Real-Time Variant Tracker™: Launched a pioneering new feature for NeXT Personal® that empowers clinicians to longitudinally track resistance and therapeutically targetable mutations during routine disease monitoring, and potentially optimize treatment.

● Published Neoadjuvant Treatment Monitoring Results in Breast Cancer: Featured data in the Journal of Clinical Oncology from the PREDICT-DNA prospective study for Triple-Negative (TNBC) and HER2+ breast cancer patients that showed NeXT Personal can outperform current standard approaches for predicting patient outcomes following neoadjuvant therapy (NAT).

● Presented Compelling Data at the American Association for Cancer Research (AACR) Annual Meeting:

○ Colorectal Cancer (CRC) Podium Presentation: Highlighted the ultrasensitive ctDNA detection by NeXT Personal for predicting and tracking response to neoadjuvant immunotherapy in CRC patients, demonstrating a remarkable 100% negative predictive value and 100% specificity for disease relapse following surgery.

○ Lung Cancer Poster Presentation: Demonstrated that ultrasensitive ctDNA monitoring with NeXT Personal successfully predicts the early response of immunotherapy in recurrent metastatic NSCLC patients.

First Quarter 2026 Financial Results Compared with First Quarter 2025

● Quarterly Revenue: $15.5 million compared with $20.6 million; reflecting the planned decline in non-core revenue as the company focuses on growing revenue from its strategic MRD offering.

● Clinical Revenue: Clinical test revenue of $1.4 million, compared with $0.3 million; delivered 7,815 clinical tests compared with 2,184, representing a 258% increase.

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● Core Revenue Streams: Pharma testing services and all other customers contributed $11.2 million. Revenue from enterprise sales (Natera) and population sequencing (the VA MVP) totaled approximately $2.9 million.

● Strong Cash Position: Ended the quarter with approximately $233.2 million in cash, cash equivalents, and short-term investments. This includes approximately $21.0 million in net proceeds from the Company’s At-The-Market (ATM) sales program, executed at a weighted-average price of $10.00 per share.

CEO Commentary

"Our accomplishments in the first quarter demonstrated that our 'Win-in-MRD' strategy is working to establish NeXT Personal as the new standard for how cancer is detected and monitored," said Chris Hall, Chief Executive Officer of Personalis. " Delivering 26% sequential and 258% year-over-year clinical volume growth—especially during what is traditionally the industry's toughest seasonal quarter reflects the strong market demand for our ultrasensitive NeXT Personal test. With new Medicare coverage for lung cancer joining our existing breast cancer win, Personalis now has a reimbursement success in two of the largest oncology indications. We are transforming our ultrasensitive MRD technology from a clinical leader into a potential commercial powerhouse and we remain firmly on track to grow our clinical revenue five-fold this year.”

Full Year 2026 Outlook

Personalis reaffirmed the following guidance for the full year of 2026:

● Total company revenue in the range of $78.0 to $80.0 million.

● Clinical test volume scaling rapidly to a range of 43,000 to 45,000 tests, reflecting 171% growth year-over-year at the midpoint.

● Clinical revenue of $10.0 to $11.0 million, representing roughly a five-fold growth year-over-year, driven by Medicare reimbursement from breast and lung cancer surveillance.

● Revenue from pharma testing services and all other customers in the range of $55.0 to $56.0 million.

● Revenue from population sequencing and enterprise sales of approximately $13.0 million.

● Gross margin in the range of 15% to 20%, reflecting the strategic decision to accelerate clinical volume adoption ahead of full reimbursement coverage to establish market share.

● Net loss of approximat