Christopher Guttman-McCabe - 25 Aug 2026 Form 4 Insider Report for Anterix Inc. (ATEX)

Reporting relationship: Chief Reg & Comm Officer
Issuer ticker: ATEX
Reported as of: 25 Aug 2026
Net transaction value: -$2,164,837
SEC form: 4
Accepted by SEC: 27 Aug 2026, 16:44:22 UTC
Prior SEC filing: 14 Jul 2026
Source filing: View source filing
Reporting owner signature: s/ Gena L. Ashe, Attorney-in-Fact

Key filing fact

Christopher Guttman-McCabe filed Form 4 for Anterix Inc. (ATEX) on 27 Aug 2026.

Key facts

This page summarizes Christopher Guttman-McCabe's Form 4 filing for Anterix Inc. (ATEX).
7 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 27 Aug 2026, 16:44.

Change

Previous filing in this sequence was filed on 14 Jul 2026.
Current net transaction value: -$2,164,837.

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 0001828490 Primary reporting owner

Guttman-McCabe Christopher

Relationship: Chief Reg & Comm Officer
Address: 3 GARRET MOUNTAIN PLAZA, SUITE 401, WOODLAND PARK
Signature: s/ Gena L. Ashe, Attorney-in-Fact
Signature date: 27 Aug 2026

Reported non-derivative transactions

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

ATEX transaction

Common Stock

Options Exercise

Transaction value
Shares: +40,000
Change %: +89%
Price: $34.72^*
Shares after: 84,876
Date: 25 Aug 2026
Ownership: Direct

ATEX transaction

Common Stock

Tax liability

Transaction value
Shares: -16,561
Change %: -20%
Price: $90.38^*
Shares after: 68,315
Date: 25 Aug 2026
Ownership: Direct
Footnotes: F1

ATEX transaction

Common Stock

Sale

Transaction value: $502,746
Shares: -5,372
Change %: -7.9%
Price: $93.59
Shares after: 62,943
Date: 25 Aug 2026
Ownership: Direct
Footnotes: F2

ATEX transaction

Common Stock

Sale

Transaction value: $722,764
Shares: -7,791
Change %: -12%
Price: $92.77
Shares after: 55,152
Date: 25 Aug 2026
Ownership: Direct
Footnotes: F3

ATEX transaction

Common Stock

Sale

Transaction value: $695,044
Shares: -7,580
Change %: -14%
Price: $91.69
Shares after: 47,572
Date: 25 Aug 2026
Ownership: Direct
Footnotes: F4

ATEX transaction

Common Stock

Sale

Transaction value: $244,283
Shares: -2,696
Change %: -5.7%
Price: $90.61
Shares after: 44,876
Date: 25 Aug 2026
Ownership: Direct
Footnotes: F5

Reported derivative securities

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

ATEX transaction Derivative

Stock Option (Right to Buy)

Options Exercise

Transaction value
Shares: -40,000
Change %: -100%
Price: $0.000000^*
Shares after: 0
Date: 25 Aug 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 40,000
Exercise price: $37.42
Footnotes: F6

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

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 6 footnotes

Footnote F1

The Reporting Person exercised a stock option to purchase 40,000 shares of the Issuer's Common Stock for $37.42 per share and paid the exercise price on a cashless basis, resulting in the Issuer withholding an aggregate of 16,561 shares of the Issuer's Common Stock subject to the stock option to pay the exercise price and to satisfy its income tax withholding and remittance obligations in connection with the exercise of the stock option. The withholding of shares referenced here does not involve an open market sale of stock.

Footnote F2

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $94.215 to $93.27, 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.

Footnote F3

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $93.265 to $92.265, 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.

Footnote F4

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $92.205 to $91.22, 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.

Footnote F5

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $91.01 to $90.06, 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.

Footnote F6

The option shares are fully vested.