0001627475 2021-05-04 2021-05-04 0001627475 false 8-K 2021-05-04 UPWORK INC. DE 001-38678 46-4337682 475 Brannan Street, Suite 430 San Francisco, CA 94107 650 316-7500 false false false false Common Stock, $0.0001 par value per share UPWK NASDAQ false