424B3

AST SpaceMobile appointed Sean Wallace as Executive Vice President and Chief Financial Officer effective May 10, 2022, replacing retiring CFO Thomas Severson, with Wallace receiving a $250,000 annual base salary, 700,000 restricted stock units (400,000 time-based vesting over four years and 300,000 performance-based), and severance provisions including 75% of base salary plus nine months of health coverage if terminated without cause. The company also filed this prospectus supplement on April 29, 2022 to update registration information regarding up to 141.5 million shares of Class A common stock available for issuance to AST & Science members upon redemption of their ownership units, with the stock trading at $7.53 per share at that time.