Form 424B5 Atara Biotherapeutics,

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ATARA Biotherapeutics supplements prospectus for stock offering

May 12, 2026 4:44 PM EDT

(Updated - May 12, 2026 4:46 PM EDT)

ATARA Biotherapeutics Inc. (NASDAQ: ATRA) filed a prospectus supplement that allows the company to continue offering common stock under its existing sales agreement despite changes in regulatory requirements.

The biotechnology company filed the second supplement to its sales agreement... More