Anterix officer proposes $401K stock sale

The securities table lists 3,754 shares from restricted stock and 1,227 from a stock option exercise.

Rhea-AI Filing Summary

Anterix Inc. (ATEX) officer Elena Marquez proposes to sell 4,981 common shares, with an aggregate market value of $400,606.71 and an approximate sale date of October 9, 2026. Morgan Stanley Smith Barney LLC is named in the broker field. The securities table lists 3,754 shares acquired as restricted stock and 1,227 shares from a stock option exercise.

Key Figures

Common shares proposed for sale: 4,981 shares Aggregate market value: $400,606.71 Shares outstanding: 19,609,786 shares +2 more

5 metrics

Common shares proposed for sale 4,981 shares Approximate sale date October 9, 2026

Aggregate market value $400,606.71 Proposed sale

Shares outstanding 19,609,786 shares Outstanding-share count listed with sale details

Restricted stock 3,754 shares Acquisition entry in the securities table

Stock option exercise 1,227 shares Acquisition entry in the securities table

Key Terms

Rule 144, Restricted Stock, Stock Option Exercise

3 terms

Rule 144 regulatory

"sales required by paragraph (e) of Rule 144"

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

Restricted Stock financial

"3,754 | 07/12/2026 | Restricted Stock"

Shares granted to an individual that carry limits on transfer or sale until certain conditions are met, such as staying with the company for a set time or hitting performance targets. Think of them as a locked gift that gradually opens; for investors they matter because they affect how many shares may enter the market later, signal management incentives and potential dilution, and reveal confidence in future company performance.

Stock Option Exercise financial

"1,227 | 10/09/2026 | Stock Option Exercise"

A stock option exercise is the act of using a previously granted right to buy shares of a company's stock at a specific, predetermined price by paying that price and receiving the shares. It matters to investors because exercising changes who owns the shares (which can dilute existing ownership), can trigger taxable events and shift potential gains or losses, and affects voting power and the company’s outstanding share count—like turning a voucher into an actual product that becomes part of circulating supply.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many ATEX shares did Elena Marquez propose to sell?

Elena Marquez, identified as an Anterix officer, proposed a sale of 4,981 common shares with an aggregate market value of $400,606.71. The approximate sale date is October 9, 2026, and Morgan Stanley Smith Barney LLC is named in the broker field.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 10/09/2026 - 04:02 PM Accepted by SEC EDGAR 10/09/2026 - 04:02 PM Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0002090789
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	ANTERIX INC.
SEC File Number	001-36827
Address of Issuer	3 Garret Mountain Plaza Suite 401 Woodland Park NEW JERSEY 07424
Phone	(973) 771-0300
Name of Person for Whose Account the Securities are To Be Sold	ELENA MARQUEZ
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Officer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004	4981	400606.71	19609786	10/09/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	07/12/2026	Restricted Stock	ISSUER			3754	07/12/2026	Not Applicable
Common	10/09/2026	Stock Option Exercise	ISSUER			1227	10/09/2026	Cash

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Nothing to Report

144: Remarks and Signature

Remarks	The securities to be sold were acquired upon the vesting of restricted stock during the period of 7/12/2026 through 10/4/2026
Date of Notice	10/09/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	06/22/2026
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/ Elena Marquez
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)