X0609 4 2026-08-19 0 0001304492 Anterix Inc. ATEX 0002035875 Heard William false C/O HEARD CAPITAL LLC 1 N. WACKER DRIVE, SUITE 3650 CHICAGO IL 60606 1 0 0 0 0 Common Stock, par value $0.0001 per share ("Common Stock") 2026-08-19 4 G 0 5400 0 D 3965 D Common Stock 1670338 I By Heard Capital LLC Represents a charitable donation of shares to a Donor Advised Fund. These securities are held by certain investment funds and/or accounts for which Heard Capital LLC serves as investment manager. The Reporting Person is the ultimate beneficial owner of Heard Capital LLC. Each of Heard Capital LLC and the Reporting Person disclaims beneficial ownership of the securities to which this filing relates for purposes of Section 16 of the Securities and Exchange Act of 1934, as amended, except to the extent of his or its pecuniary interest therein. s/ Gena L. Ashe, Attorney-in-Fact 2026-08-20