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person · Reporting owner

Martin Heather

Disclosed activity across 1 company

Tapewire entity
44651
SEC CIK
0002090798

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Reported relationships

Latest disclosed role at each company.

CompanyLast reported asReport datePublished
Anterix Inc.ATEX · Entity 4597Chief Marketing Officer · Chief of StaffSeptember 09, 2026September 11, 2026

Disclosed balances

About these balances

Latest available filing per company, not a reconstructed current portfolio. Matching sequences show the last reported balance with all source rows expandable; grouping alone does not establish account ownership. Do not add unresolved positions together. Filings may omit unchanged positions, and amendments may correct only part of an older disclosure. Jointly reported shares are not necessarily this owner's personal holdings.

Anterix Inc.

Report date September 09, 2026 · Filed September 11, 2026

Security / awardOwnership accountDisclosed shares / unitsDisclosure context
Common StockSEC Table I · non-derivativeDirect34,807 Reported balance After 2026-09-09 transaction · row 1 Account or security details depend on footnotes; rows are not merged.
1 source row

Row 1 · 2026-09-09 · Tax withholding · Disposed 3,465 · Balance 34,807

F1: The shares were withheld by the Issuer to satisfy withholding obligations in connection with the partial vesting and settlement of restricted stock units.

Common StockSEC Table I · non-derivativeDirect26,743 Reported balance After 2026-09-10 transaction · row 2 Account or security details depend on footnotes; rows are not merged.
1 source row

Row 2 · 2026-09-10 · Sale · Disposed 8,064 · Balance 26,743

F2: 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.

Filing footnotes · ownership attribution and instrument terms

F1: The shares were withheld by the Issuer to satisfy withholding obligations in connection with the partial vesting and settlement of restricted stock units.

F2: 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.

Transaction history

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Purchases/sales include open-market and private transactions. Plan disclosure applies to the filing; individual rows may differ. “Not disclosed” is not “unplanned.”

The cutoff filters transaction history only. Company summaries and owner relationships show the latest available disclosures. Parser corrections can improve historical records.

Transaction dateCompanyActivity / securityShares / unitsReported priceReported valueDetails
September 10, 2026 Filed Sep 11, 2026 20:09 UTC Anterix Inc. ATEX · Entity 4597 SaleCommon Stock 8,064 $84.20 $678,997.67
Disclosure

SEC source: 0002090798-26-000006 · wk-form4_1789157359.xml · nonDerivative · entry 2

Martin Heather · CIK 0002090798 · Chief Marketing Officer · Chief of Staff

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 26,743

F2 · balance_after: 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.

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September 09, 2026 Filed Sep 11, 2026 20:09 UTC Anterix Inc. ATEX · Entity 4597 Tax withholdingCommon Stock 3,465 $85.44 $296,049.60
Disclosure

SEC source: 0002090798-26-000006 · wk-form4_1789157359.xml · nonDerivative · entry 1

Martin Heather · CIK 0002090798 · Chief Marketing Officer · Chief of Staff

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 34,807

F1 · shares: The shares were withheld by the Issuer to satisfy withholding obligations in connection with the partial vesting and settlement of restricted stock units.

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May 20, 2026 Filed May 22, 2026 23:47 UTC Anterix Inc. ATEX · Entity 4597 GrantStock Option (Right to Buy) · Derivative 17,453 $0.00 Strike: $60.90 $0.00
Disclosure

SEC source: 0002090798-26-000003 · wk-form4_1779493647.xml · derivative · entry 2

Martin Heather · CIK 0002090798 · Chief Marketing Officer · Chief of Staff

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 17,453

Underlying: Common Stock · 17,453 shares

Expires 2036-05-20

F2 · derivative.exercise_date: 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.

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May 20, 2026 Filed May 22, 2026 23:47 UTC Anterix Inc. ATEX · Entity 4597 GrantCommon Stock 3,694 $0.00 $0.00
Disclosure

SEC source: 0002090798-26-000003 · wk-form4_1779493647.xml · nonDerivative · entry 1

Martin Heather · CIK 0002090798 · Chief Marketing Officer · Chief of Staff

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 38,272

F1 · shares: 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.

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Value uses the disclosed total when available, otherwise shares × reported transaction price. It is not an estimate of exercise cash cost or investment performance.