X0306 4 2020-08-13 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 2020-08-13 4 S 0 7835 44.477 D 83330 D Common Stock 2020-08-13 4 S 0 200 44.925 D 83130 D Common Stock 2020-08-14 4 M 0 8808 20.00 A 91938 D Common Stock 2020-08-14 4 S 0 6572 44.492 D 85366 D Common Stock 2020-08-14 4 S 0 2775 45.211 D 82591 D Common Stock 2020-08-17 4 M 0 8162 20.00 A 90753 D Common Stock 2020-08-17 4 S 0 8162 44.687 D 82591 D Stock Option (Right to Buy) 20.00 2020-08-14 4 M 0 8808 0.00 D 2024-05-14 Common Stock 8808 126192 D Stock Option (Right to Buy) 20.00 2020-08-17 4 M 0 8162 0.00 D 2024-05-14 Common Stock 8162 118030 D The sale of shares was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person and includes the sale of shares in order to cover tax liabilities in connection with the vesting of restricted stock units and the exercise of stock options. This transaction was executed in multiple sales through a sale order executed by a broker-dealer at prices ranging from $43.90 to $44.90. 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 $44.92 to $44.93. 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 $43.98 to $44.92. 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 $45.00 to $45.48. 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 $44.28 to $45.19. 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. The option shares are fully vested. /s/ Timothy Gray, attorney-in-fact 2020-08-17