Certain Class B Common Stock of FirstMark Horizon Acquisition Corp. are subject to a Lock-Up Agreement Ending on 4-APR-2021. These Class B Common Stock will be under lockup for 181 days starting from 5-OCT-2020 to 4-APR-2021.

Details:
The company's sponsor and the directors and officers have agreed that they will not offer, sell, contract to sell, pledge or otherwise dispose of, directly or indirectly, without the prior written consent of Credit Suisse Securities (USA) LLC for a period of 180 days after the date of the prospectus, any units, warrants, shares of common stock or any other securities convertible into, or exercisable, or exchangeable for, shares of Class A common stock.