X0306 4 2022-03-26 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 2022-03-26 4 A 0 36000 0.00 A 556633 D Represents shares underlying restricted stock units ("RSUs"). The RSUs will vest in four equal quarterly installments, with the first quarterly installment vesting on May 15, 2022, in each case subject to the Reporting Person's continued service through the applicable vesting date. None of the RSUs will accelerate pursuant to the Issuer's Change of Control Policy for Officers or the Reporting Person's participation agreement thereunder. Richard Meamber, Attorney-in-Fact 2022-03-28