0001370053 2026-04-20 2026-04-20 ANAPTYSBIO, INC true 0001370053 8-K/A 2026-04-20 DE 001-37985 20-3828755 10770 Wateridge Circle Suite 210 San Diego CA 92121 (858) 362-6295 false false false false Common stock, par value $0.001 per share ANAB NASDAQ false In this Amendment No. 1 the Company amends the Current Report on Form 8-K filed by the Company with the Securities and Exchange Commission on April 20, 2026 (the “Original Form 8-K”) that reported the completion of the Spin-Off. The Original Form 8-K did not include the unaudited pro forma financial information of the Company reflecting the performance of the Company’s businesses after giving effect to the Spin-Off. This Amendment No. 1 to the Original Form 8-K is being filed to include such pro forma financial information as required under Item 9.01(b) of Form 8-K.