X0306 4 2022-09-12 1 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 2022-09-12 4 D 0 37329 23.00 D 0 D Common Stock 2022-09-12 4 D 0 83013 23.00 D 0 D Includes 520 shares purchased on September 1, 2022 under the Issuer's 2013 Employee Stock Purchase Plan. Represents shares of the Issuer's common stock that were disposed of in connection with the merger of Dupin Inc. with and into the Issuer (the "Merger") pursuant to an Agreement and Plan of Merger, dated as of March 7, 2022, by and among the Issuer, Google LLC ("Google") and Dupin Inc. At the effective time of the Merger, each share of the Issuer's common stock was cancelled and converted into the right to receive $23.00 in cash. At the effective time of the Merger, each outstanding restricted stock unit ("RSU") was canceled and converted into a right to receive an amount in cash equal to the product of (1) $23.00 and (2) the total number of shares of the Issuer's common stock then-subject to such RSU. With respect to vested RSUs, such cash amount became payable at the effective time of the Merger and, with respect to unvested RSUs, such cash amount will vest and become payable in accordance with the vesting schedule applicable to the corresponding unvested RSU, generally subject to the Reporting Person's continued employment with Google and its affiliates. Richard Meamber, Attorney-in-Fact 2022-09-12