UPDATE 1-Tempus to buy cancer test maker Personalis for $1.5 billion

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Adds share move in paragraph 2, deal details throughout

- Tempus AI TEM.O said on Monday it would buy Personalis PSNL.O in an all-stock deal valued at about $1.5 billion, adding a cancer test to the AI-enabled precision medicine firm's oncology portfolio.

Personalis shares fell 5% in premarket trading, while Tempus shares fell 4%.

Tempus will gain access to Personalis' NeXT Personal cancer test, designed to find microscopic traces of tumor DNA in a patient's blood to track treatment response and detect early recurrence.

The acquisition expands on an existing partnership between the companies, under which Tempus invested in Personalis in November 2023 to develop the NeXT Personal test.

The deal is expected to close in late 2026 or early 2027.