X0609 4 2026-09-09 0 0001304492 Anterix Inc. ATEX 0002090798 Martin Heather false 3 GARRET MOUNTAIN PLAZA, SUITE 401 WOODLAND PARK NJ 07424 0 1 0 1 Chief Marketing Officer Chief of Staff 0 Common Stock 2026-09-09 4 F 0 3465 85.44 D 34807 D Common Stock 2026-09-10 4 S 0 8064 84.2011 D 26743 D The shares were withheld by the Issuer to satisfy withholding obligations in connection with the partial vesting and settlement of restricted stock units. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $84.468 to $84.00, 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. /s/ Gena L. Ashe, Attorney-in-Fact 2026-09-11