0001671858 2021-09-13 2021-09-13 false 0001671858 8-K 2021-09-13 Silverback Therapeutics, Inc. DE 001-39756 81-1489190 500 Fairview Ave N Suite 600 Seattle WA 98109 (206) 456-2900 false false false false Common Stock, $0.0001 par value per share SBTX NASDAQ true false