X0306 4 2022-08-15 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 2022-08-15 4 F 0 2861 22.86 D 119822 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 August 15, 2022 of restricted stock units held by the Reporting Person. Includes 1,035 shares purchased on May 31, 2022 under the Issuer's 2013 Employee Stock Purchase Plan. Richard Meamber, Attorney-in-Fact 2022-08-17