Heather Martin plans sale of 8,064 Anterix shares

Heather Martin filed a Rule 144 notice to potentially sell 8,064 shares of Anterix Inc. common stock.

Available on EDGAR 09/10/2026 - 04:07 PM EDT Accepted by SEC EDGAR 09/10/2026 - 04:06 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

Anterix Inc. (ATEX) has a notice of proposed sale of common stock filed under Rule 144 for the account of Heather Martin. The filing covers the potential sale of 8,064 shares of Anterix common stock, to be handled through Morgan Stanley Smith Barney LLC Executive Financial Services on NASDAQ.

The shares are described as restricted stock acquired from the issuer, and the filing lists an aggregate market value of $678,997.67 for the shares proposed to be sold. The notice is dated September 10, 2026.

Key Figures

Shares proposed to be sold: 8,064 shares Aggregate market value: $678,997.67 Shares outstanding: 19,609,786 shares +2 more

5 metrics

Shares proposed to be sold 8,064 shares Common stock covered by Heather Martin’s Rule 144 notice

Aggregate market value $678,997.67 Aggregate market value of 8,064 Anterix common shares in the notice

Shares outstanding 19,609,786 shares Anterix common stock shares outstanding as listed in the securities information

Approximate sale date September 10, 2026 Approximate date of proposed sale under Rule 144

Shares acquired 8,064 shares Restricted stock from issuer listed in the securities to be sold section

Key Terms

Rule 144, restricted stock, aggregate market value

3 terms

Rule 144 regulatory

"See the definition of "person" in paragraph (a) 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

"Common | 09/09/2026 | Restricted Stock | Issuer"

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.

aggregate market value financial

"Common | Morgan Stanley Smith Barney LLC... | 8064 | 678997.67"

Aggregate market value is the combined price you would pay to buy all outstanding shares of a company or all companies in a group at current market prices — essentially the sum of each stock’s market capitalization. It matters to investors because it shows the overall size and weight of an investment or sector (like the total cost to buy every piece of a puzzle), helps compare scale across companies or markets, and influences index composition and risk exposure.

FAQ

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

What does the Form 144 filing mean for Anterix Inc. (ATEX)?

The Form 144 notice states that Heather Martin may sell 8,064 shares of Anterix Inc. common stock under Rule 144. This is a disclosure of a potential resale of restricted or control securities and does not itself complete any sale.

How many Anterix (ATEX) shares are covered by Heather Martin’s Form 144?

The notice covers a potential sale of 8,064 shares of Anterix Inc. common stock. The filing also lists an aggregate market value of $678,997.67 for these shares.

Who is the broker for the potential Anterix (ATEX) share sale?

The Form 144 indicates that the proposed sale of Anterix Inc. common stock for Heather Martin’s account would be handled by Morgan Stanley Smith Barney LLC Executive Financial Services, located at 1 New York Plaza, New York, New York.

What type of Anterix (ATEX) securities is Heather Martin planning to sell?

The securities listed are common stock of Anterix Inc., described as restricted stock acquired from the issuer. These shares are being noticed for potential resale under Rule 144.

When is the approximate date of the proposed Anterix (ATEX) share sale?

The notice lists an approximate sale date of September 10, 2026 for the proposed Rule 144 transaction in Anterix Inc. common stock.

How many Anterix (ATEX) shares are shown as outstanding in the Form 144?

The Form 144 lists 19,609,786 shares of Anterix Inc. common stock as outstanding in connection with the securities information provided.

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

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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	0002090798
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	HEATHER MARTIN
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	8064	678997.67	19609786	09/10/2026	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	09/09/2026	Restricted Stock	Issuer			8064	09/09/2026	Not Applicable

* 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
Date of Notice	09/10/2026
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/ Heather Martin
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)