Heather Martin - 20 May 2026 Form 4 Insider Report for Anterix Inc. (ATEX)

Reporting relationship: Chief Marketing Officer, Chief of Staff
Issuer ticker: ATEX
Reported as of: 20 May 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 22 May 2026, 19:47:30 UTC
Prior SEC filing: 04 Nov 2025
Source filing: View source filing
Reporting owner signature: /s/ Gena L. Ashe, Attorney-in-Fact

Key filing fact

Heather Martin filed Form 4 for Anterix Inc. (ATEX) on 22 May 2026.

Key facts

This page summarizes Heather Martin's Form 4 filing for Anterix Inc. (ATEX).
2 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 22 May 2026, 19:47.

Change

Previous filing in this sequence was filed on 04 Nov 2025.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0002090798 Primary reporting owner

Martin Heather

Relationship: Chief Marketing Officer, Chief of Staff
Address: 3 GARRET MOUNTAIN PLAZA, SUITE 401, WOODLAND PARK
Signature: /s/ Gena L. Ashe, Attorney-in-Fact
Signature date: 22 May 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

ATEX transaction

Common Stock

Award

Transaction value
Shares: +3,694
Change %: +11%
Price: $0.000000^*
Shares after: 38,272
Date: 20 May 2026
Ownership: Direct
Footnotes: F1

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

ATEX transaction Derivative

Stock Option (Right to Buy)

Award

Transaction value
Shares: +17,453
Change %
Price: $0.000000^*
Shares after: 17,453
Date: 20 May 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 17,453
Exercise price: $60.90
Footnotes: F2

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 2 footnotes

Footnote F1

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.

Footnote F2

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.