X0609 4 2026-08-25 0 0001304492 Anterix Inc. ATEX 0001828490 Guttman-McCabe Christopher false 3 GARRET MOUNTAIN PLAZA SUITE 401 WOODLAND PARK NJ 07424 0 1 0 0 Chief Reg & Comm Officer 0 Common Stock 2026-08-25 4 M 0 40000 34.72 A 84876 D Common Stock 2026-08-25 4 F 0 16561 90.38 D 68315 D Common Stock 2026-08-25 4 S 0 5372 93.5863 D 62943 D Common Stock 2026-08-25 4 S 0 7791 92.7691 D 55152 D Common Stock 2026-08-25 4 S 0 7580 91.6945 D 47572 D Common Stock 2026-08-25 4 S 0 2696 90.6095 D 44876 D Stock Option (Right to Buy) 37.42 2026-08-25 4 M 0 40000 0 D 2034-02-28 Common Stock 40000 0 D The Reporting Person exercised a stock option to purchase 40,000 shares of the Issuer's Common Stock for $37.42 per share and paid the exercise price on a cashless basis, resulting in the Issuer withholding an aggregate of 16,561 shares of the Issuer's Common Stock subject to the stock option to pay the exercise price and to satisfy its income tax withholding and remittance obligations in connection with the exercise of the stock option. The withholding of shares referenced here does not involve an open market sale of stock. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $94.215 to $93.27, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of securities sold at each separate price within the ranges set forth in this footnote to this Form 4. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $93.265 to $92.265, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of securities sold at each separate price within the ranges set forth in this footnote to this Form 4. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $92.205 to $91.22, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of securities sold at each separate price within the ranges set forth in this footnote to this Form 4. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $91.01 to $90.06, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of securities sold at each separate price within the ranges set forth in this footnote to this Form 4. The option shares are fully vested. s/ Gena L. Ashe, Attorney-in-Fact 2026-08-27