X0306 4 2020-09-03 0 0001304492 Anterix Inc. ATEX 0000937846 OBRIEN MORGAN E 3 GARRET MOUNTAIN PLAZA SUITE 401 WOODLAND PARK NJ 07424 1 1 0 0 Executive Chairman Common Stock 2020-09-03 4 A 0 26009 0.00 A 108600 D Common Stock 2020-09-04 4 S 0 9715 42.2971 D 98885 D Common Stock 2020-09-08 4 S 0 4635 40.1781 D 94250 D Stock Option (Right to Buy) 46.85 2020-09-03 4 A 0 26464 0.00 A 2020-09-03 2025-08-29 Common Stock 26464 26464 D On February 28, 2020, the Reporting Person was granted a performance-based restricted stock unit award (the "RSU"), which vests in two tranches upon the Issuer achieving certain performance milestones prior to December 30, 2020. The Compensation Committee determined that the performance milestone for the first tranche was satisfied, resulting in the vesting of the reported shares of common stock under the RSU. Represents shares sold to satisfy tax withholding obligations in connection with the partial vesting and settlement of restricted stock units granted August 2018 and February 2020. This transaction was executed in multiple sales through a sale order executed by a broker-dealer at prices ranging from $42.00 to $42.63. The price reported in this column reflects the weighted average sale price. The Reporting Person will provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares sold at each separate price. This transaction was executed in multiple sales through a sale order executed by a broker-dealer at prices ranging from $39.92 to $40.85. The price reported in this column reflects the weighted average sale price. The Reporting Person will provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares sold at each separate price. On February 28, 2020, the Reporting Person was granted a performance-based stock option, which vests in two tranches upon the Issuer achieving certain performance milestones prior to December 30, 2020. The Compensation Committee determined that the performance milestone for the first tranche was satisfied, resulting in the vesting of the reported shares of common stock under the stock option. /s/ Timothy Gray, attorney-in-fact 2020-09-08