Heather Martin - 09 Sep 2026 Form 4 Insider Report for Anterix Inc. (ATEX)

Reporting relationship: Chief Marketing Officer, Chief of Staff
Issuer ticker: ATEX
Reported as of: 09 Sep 2026
Net transaction value: -$678,998
SEC form: 4
Accepted by SEC: 11 Sep 2026, 16:09:22 UTC
Prior SEC filing: 22 May 2026
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 11 Sep 2026.

Key facts

This page summarizes Heather Martin's Form 4 filing for Anterix Inc. (ATEX).
2 reported transactions and 0 derivative rows are listed below.
Accepted by SEC: 11 Sep 2026, 16:09.

Change

Previous filing in this sequence was filed on 22 May 2026.
Current net transaction value: -$678,998.

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: 11 Sep 2026

Reported non-derivative transactions

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

ATEX transaction

Common Stock

Tax liability

Transaction value
Shares: -3,465
Change %: -9.1%
Price: $85.44^*
Shares after: 34,807
Date: 09 Sep 2026
Ownership: Direct
Footnotes: F1

ATEX transaction

Common Stock

Sale

Transaction value: $678,998
Shares: -8,064
Change %: -23%
Price: $84.20
Shares after: 26,743
Date: 10 Sep 2026
Ownership: Direct
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

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

Footnote 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.