0001671584 2026-09-22 2026-09-22 0001671584 false 8-K 2026-09-22 APTEVO THERAPEUTICS INC. DE 001-37746 81-1567056 2401 4th Avenue Suite 1050 Seattle WA 98121 (206) 838-0500 Not Applicable false false false false Common Stock, $0.001 par value APVO NASDAQ false