Certain Common Stock of Synchronoss Technologies, Inc. are subject to a Lock-Up Agreement Ending on 24-SEP-2021. These Common Stock will be under lockup for 91 days starting from 25-JUN-2021 to 24-SEP-2021. Details: The executive officers and directors have agreed, subject to limited exceptions, for a period of 90 days after the date of this prospectus supplement, not to offer, pledge, sell, contract to sell, sell any option or contract to purchase, purchase any option or contract to sell, grant any option, right or warrant to purchase, lend, or otherwise transfer or dispose of, directly or indirectly, any shares of common stock or any securities convertible into or exchangeable or exercisable for shares of common stock.