SEC Form 4/A · accession 0001669943-26-000021

Anterix Inc. · ATEX

Statement of changes in beneficial ownership, as filed. Original on EDGAR ↗

This is an amendment (Form 4/A). It replaces an earlier filing for the same period.

Reporting owner

Officer — Chief Legal Officer & Corp Sec

Period of report

Sep 8, 2026

Accepted (ET)

Sep 11, 2026 · 4:08 pm EDT

Rule 10b5-1 plan

box not checked

Issuer CIK

0001304492

Table I — non-derivative securities

Security	Date	Code	Shares	Price	A/D	Owned after	D/I
Common Stock	Sep 8, 2026	S	293	$85.44	D	9,238	D
Common Stock	Sep 8, 2026	M	6,833	$34.96	A	16,071	D
Common Stock^F1	Sep 8, 2026	F	2,769	$86.27	D	13,302	D
Common Stock	Sep 8, 2026	S	4,064	$85.44	D	9,238	D

Security	Conv. / exercise price	Date	Code	Shares	A/D	Exercisable	Expires	Underlying	Underlying shares	Owned after	D/I
Stock Option (Right to Buy)^F2	$34.96	Sep 8, 2026	M	6,833	D	—	May 20, 2035	Common Stock	6,833	35,658	D

F1The Reporting Person exercised a stock option to purchase 6,833 shares of the Issuer's Common Stock for $34.96 per share and paid the exercise price on a cashless basis, resulting in the Issuer withholding an aggregate of 2,769 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.
F2The option shares subject to this option shall vest and become exercisable in three equal annual installments, with 1/3 of the option shares vesting and becoming exercisable on May 20, 2026, and with the remaining option shares vesting and becoming exercisable in 2 equal annual installments thereafter.