X0306 4 2022-05-15 0 0001370880 Mandiant, Inc. MNDT 0001140541 MEDINA JAMES C/O MANDIANT, INC. 11951 FREEDOM DRIVE, 6TH FLOOR RESTON VA 20190 0 1 0 0 SVP, Finance, CC & CAO Common Stock 2022-05-15 4 F 0 3065 21.78 D 121648 D This transaction is not a sale of shares by the Reporting Person. Instead, the shares were withheld by the Issuer, to satisfy withholding taxes in connection with the vesting on May 15, 2022 of restricted stock units held by the Reporting Person. Richard Meamber, Attorney-in-Fact 2022-05-17