X0306 4 2022-02-07 0 0001370880 Mandiant, Inc. MNDT 0001254783 VERDECANNA FRANK C/O MANDIANT, INC. 11951 FREEDOM DRIVE, 6TH FLOOR RESTON VA 20190 0 1 0 0 EVP & CFO Common Stock 2022-02-07 4 A 0 81046 0.00 A 633342 D Represents shares underlying restricted stock units ("RSUs") paid to the Reporting Person upon achievement of certain performance criteria. The RSUs will vest in full on February 15, 2022, subject to the Reporting Person's continued service through such date. Richard Meamber, Attorney-in-Fact 2022-02-09