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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."}],"balance_after":26743,"source":{"system":"sec-edgar","filing":"0002090798-26-000006","document":"wk-form4_1789157359.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/2090798/000209079826000006/wk-form4_1789157359.xml","form_type":"4"}},{"id":4615830,"issuer":{"id":4597,"kind":"organization","name":"Anterix Inc.","symbol":"ATEX"},"owners":[{"id":44651,"kind":"person","name":"Martin Heather","position":1,"cik":"0002090798","reported_name":"Martin Heather","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Marketing Officer","other_text":"Chief of Staff"}}],"security":"Common Stock","published_at":"2026-09-11T20:09:22.000Z","date":"2026-09-09","kind":"tax_withholding","planned":false,"acquired":false,"shares":3465,"price":85.44,"value":296049.6,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The shares were withheld by the Issuer to satisfy withholding obligations in connection with the partial vesting and settlement of restricted stock units."}],"balance_after":34807,"source":{"system":"sec-edgar","filing":"0002090798-26-000006","document":"wk-form4_1789157359.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2090798/000209079826000006/wk-form4_1789157359.xml","form_type":"4"}},{"id":765580,"issuer":{"id":4597,"kind":"organization","name":"Anterix Inc.","symbol":"ATEX"},"owners":[{"id":44651,"kind":"person","name":"Martin Heather","position":1,"cik":"0002090798","reported_name":"Martin Heather","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Marketing Officer","other_text":"Chief of Staff"}}],"security":"Stock Option (Right to Buy)","published_at":"2026-05-22T23:47:30.000Z","date":"2026-05-20","kind":"grant","planned":false,"acquired":true,"shares":17453,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The option shares vest and become exercisable over three years, with 1/3 vesting on May 20, 2027, and 1/12 vesting quarterly thereafter on August 10, November 10, February 10, and May 20 of each year through May 20, 2029."}],"balance_after":17453,"derivative":{"exercise_price":60.9,"expiration_date":"2036-05-20","underlying":"Common Stock","underlying_shares":17453},"source":{"system":"sec-edgar","filing":"0002090798-26-000003","document":"wk-form4_1779493647.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1304492/000209079826000003/wk-form4_1779493647.xml","form_type":"4"}},{"id":765579,"issuer":{"id":4597,"kind":"organization","name":"Anterix Inc.","symbol":"ATEX"},"owners":[{"id":44651,"kind":"person","name":"Martin Heather","position":1,"cik":"0002090798","reported_name":"Martin Heather","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Marketing Officer","other_text":"Chief of Staff"}}],"security":"Common Stock","published_at":"2026-05-22T23:47:30.000Z","date":"2026-05-20","kind":"grant","planned":false,"acquired":true,"shares":3694,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents the issuance of restricted stock units (\"RSUs\"). Each RSU represents a contingent right to receive one share of Issuer's Common Stock. The RSUs vest over three years, with 1/3 vesting on May 20, 2027, and 1/12 vesting quarterly thereafter on August 10, November 10, February 10, and May 20 of each year through May 20, 2029."}],"balance_after":38272,"source":{"system":"sec-edgar","filing":"0002090798-26-000003","document":"wk-form4_1779493647.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1304492/000209079826000003/wk-form4_1779493647.xml","form_type":"4"}}]}