Owl Creek updates Anterix (ATEX) stake after share count increase

Rhea-AI Filing Summary

Owl Creek Asset Management and Jeffrey A. Altman updated their ownership reporting in Anterix Inc. following an increase in shares outstanding. Owl Creek reports beneficial ownership of 5,411,776 shares, or 27.7% of Anterix common stock. Altman reports beneficial ownership of 5,551,684 shares, or 28.5% of the class.

The filing states that these ownership percentages declined solely because Anterix’s outstanding shares rose to 19,506,240, including 7,767 shares underlying unvested restricted stock awards. Altman holds 15,416 vested and unvested restricted stock awards and 124,492 shares directly, with no common stock transactions by the reporting persons in the past 60 days.

Insights

Equity ownership analyst

Beneficial ownership unchanged; lower percentage reflects dilution, not selling.

Owl Creek Asset Management and Jeffrey A. Altman report essentially steady Anterix exposure, with Owl Creek at 5,411,776 shares and Altman at 5,551,684 shares beneficially owned. The amendment mainly refreshes disclosure rather than signaling a new investment move.

The document explains that their ownership percentages fell because Anterix’s outstanding share count increased to 19,506,240, not due to share sales. It also confirms no common stock transactions by the reporting persons during the past sixty days, reinforcing that this is a percentage adjustment driven by dilution.

Altman’s position includes 15,416 vested and unvested restricted stock awards received for board service and 124,492 shares held directly. Subsequent filings may further update these figures if Anterix’s capital structure or the holders’ positions change.

Key Figures

Owl Creek beneficial ownership: 5,411,776 shares Altman beneficial ownership: 5,551,684 shares Shares outstanding: 19,506,240 shares +5 more

8 metrics

Owl Creek beneficial ownership 5,411,776 shares Represents 27.7% of Anterix common stock

Altman beneficial ownership 5,551,684 shares Represents 28.5% of Anterix common stock

Shares outstanding 19,506,240 shares Anterix common shares used to calculate ownership percentages

Altman restricted stock awards 15,416 awards Vested and unvested awards for board service

Altman direct holdings 124,492 shares Anterix common stock held directly by Altman

Unvested RSAs in denominator 7,767 shares Unvested restricted stock awards included in outstanding share count

Owl Creek shared voting power 5,411,776 shares Shares with shared voting and dispositive power

Altman sole voting power 139,908 shares Includes restricted stock awards and directly held shares

Key Terms

beneficially owned, restricted stock awards, sole voting power, shared voting power, +2 more

6 terms

beneficially owned financial

"for the aggregate number of shares of Common Stock and percentages of the shares of Common Stock beneficially owned by each of the Reporting Persons."

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

restricted stock awards financial

"Mr. Altman holds a total of 15,416 vested and unvested restricted stock awards received in consideration for his services on the board of directors"

Restricted stock awards are company shares given to employees or executives that cannot be sold or transferred until certain conditions — like staying with the company for a set time or meeting performance targets — are met, like a gift that is locked in a safe until rules are satisfied. Investors care because these awards tie management’s pay to company performance, can increase the number of shares outstanding when they become tradable (dilution), and may signal expected future selling pressure or commitment to long-term growth.

sole voting power financial

"Number of Shares Beneficially Owned by Each Reporting Person With: | 7 | Sole Voting Power 0.00"

Sole voting power is the exclusive right to cast votes attached to a shareholder’s stock without needing approval from anyone else. Like holding the only remote control for a TV, it lets that holder decide corporate matters such as board members, mergers, and policy changes, making it important to investors because it concentrates control and can strongly influence a company’s strategy and the value of its shares.

shared voting power financial

"Number of Shares Beneficially Owned by Each Reporting Person With: | 8 | Shared Voting Power 5,411,776.00"

Shared voting power occurs when two or more parties jointly have the right to vote or decide how a block of company shares is cast, like co-owners who must agree before moving a piece of furniture. Investors care because who controls voting rights affects board elections, major corporate decisions and takeover outcomes, and shared control can alter regulatory disclosures and the practical influence any holder has over a company’s direction and value.

sole dispositive power financial

"Number of Shares Beneficially Owned by Each Reporting Person With: | 9 | Sole Dispositive Power 0.00"

Sole dispositive power is the exclusive legal authority to decide what happens to a security — for example, whether to sell, transfer, or retain shares — without needing anyone else’s permission. Investors care because it signals who truly controls the economic outcome of an investment: like holding the only key to a safe, the holder can realize gains or losses and may trigger regulatory reporting, insider rules, or influence over corporate ownership.

shared dispositive power financial

"Number of Shares Beneficially Owned by Each Reporting Person With: | 10 | Shared Dispositive Power 5,411,776.00"

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Available on EDGAR 07/08/2026 - 05:23 PM Accepted by SEC EDGAR 07/08/2026 - 05:22 PM Learn about SEC filing dates

FAQ

How many Anterix (ATEX) shares does Owl Creek Asset Management report owning?

Owl Creek Asset Management reports beneficial ownership of 5,411,776 Anterix common shares. This position represents 27.7% of the outstanding common stock, based on 19,506,240 Anterix shares outstanding including shares underlying unvested restricted stock awards.

What is Jeffrey A. Altman’s reported ownership stake in Anterix (ATEX)?

Jeffrey A. Altman reports beneficial ownership of 5,551,684 Anterix common shares, equal to 28.5% of the class. His holdings include 15,416 vested and unvested restricted stock awards and 124,492 shares of common stock held directly.

Why did Owl Creek’s and Jeffrey Altman’s ownership percentages in Anterix (ATEX) decrease?

Their ownership percentages decreased because Anterix’s outstanding share count increased. The filing states the percentage drop resulted solely from a higher total of 19,506,240 common shares outstanding, rather than any change in the number of shares they beneficially own.

Have Owl Creek or Jeffrey Altman traded Anterix (ATEX) shares recently?

No. The filing explicitly states that no transactions in Anterix common stock were effected by the reporting persons during the past sixty days. Their current beneficial share counts are unchanged from the most recent Form 4 filing referenced.

What restricted stock awards does Jeffrey Altman hold in Anterix (ATEX)?

Jeffrey Altman holds 15,416 vested and unvested restricted stock awards in Anterix. These awards were received as consideration for his services on Anterix’s board of directors and are counted as part of his reported beneficial ownership stake.

What share count did the Anterix (ATEX) ownership percentages use?

The reported ownership percentages are calculated using 19,506,240 Anterix common shares outstanding. This figure combines 19,498,473 shares outstanding as of June 19, 2026, plus 7,767 shares underlying the unvested restricted stock awards referenced in the filing.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13D

Under the Securities Exchange Act of 1934

(Amendment No. 8)

Anterix Inc.

(Name of Issuer)

Common Stock, par value $0.0001 per share

(Title of Class of Securities)

03676C100

(CUSIP Number)

Ele Klein
McDermott Will & Schulte LLP, 919 Third Avenue
New York, NY, 10022
212-756-2000

(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)

06/25/2026

(Date of Event Which Requires Filing of This Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§ 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box.

The information required on the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

schemaVersion:

SCHEDULE 13D

CUSIP Number(s): 03676C100

1

Name of reporting person

Owl Creek Asset Management, L.P.

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

AF

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 0.00
8	Shared Voting Power 5,411,776.00
9	Sole Dispositive Power 0.00
10	Shared Dispositive Power 5,411,776.00

11

Aggregate amount beneficially owned by each reporting person

5,411,776.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

27.7 %

14

Type of Reporting Person (See Instructions)

PN

SCHEDULE 13D

CUSIP Number(s): 03676C100

1

Name of reporting person

Jeffrey A. Altman

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

AF

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 139,908.00
8	Shared Voting Power 5,411,776.00
9	Sole Dispositive Power 139,908.00
10	Shared Dispositive Power 5,411,776.00

11

Aggregate amount beneficially owned by each reporting person

5,551,684.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

28.5 %

14

Type of Reporting Person (See Instructions)

IN

Comment for Type of Reporting Person:

Note to rows (7)(9)(11)(13): Includes a total of (i) 15,416 vested and unvested restricted stock awards held by Mr. Altman and (ii) 124,492 shares of Common Stock directly held by Mr. Altman.

SCHEDULE 13D

Item 1.	Security and Issuer
(a)	Title of Class of Securities: Common Stock, par value $0.0001 per share
(b)	Name of Issuer: Anterix Inc.
(c)	Address of Issuer's Principal Executive Offices: 3 GARRET MOUNTAIN PLAZA, SUITE 401, WOODLAND PARK, NEW JERSEY , 07424.
Item 1 Comment: The following constitutes Amendment No. 8 to the Schedule 13D ("Amendment No. 8"). This Amendment No. 8 amends the Schedule 13D as specifically set forth herein. Capitalized terms used herein and not otherwise defined in this Amendment No. 8 have the meanings set forth in the Schedule 13D. This Amendment No. 8 amends Items 3 and 5(a)-(c) as set forth below. This Amendment No. 8 is being filed to report a decrease in the percentage of the shares of Common Stock beneficially owned by the Reporting Persons, which decrease resulted solely from an increase in the number of outstanding shares of Common Stock reported by the Issuer.
Item 3.	Source and Amount of Funds or Other Consideration
	Item 3 is hereby amended and restated in its entirety as follows: Mr. Altman holds a total of 15,416 vested and unvested restricted stock awards received in consideration for his services on the board of directors of the Issuer. Mr. Altman may be deemed to hold his stock awards for the benefit of the Owl Creek Funds.
Item 5.	Interest in Securities of the Issuer
(a)	Item 5(a) is hereby amended and restated in its entirety as follows: See rows (11) and (13) of the cover pages to this Schedule 13D for the aggregate number of shares of Common Stock and percentages of the shares of Common Stock beneficially owned by each of the Reporting Persons. The number of shares of Common Stock beneficially owned by the Reporting Persons is unchanged since the Reporting Persons' most recent filing on Form 4, filed with the Securities and Exchange Commission on August 7, 2025. The decrease in the percentage of the shares of Common Stock beneficially owned by the Reporting Persons resulted solely from an increase in the number of outstanding shares of Common Stock reported by the Issuer. The percentages used in this Schedule 13D are calculated based upon 19,506,240 shares of Common Stock outstanding, which is the sum of (i) 19,498,473 shares of Common Stock outstanding as of June 19, 2026, as reported in the Issuer's Annual Report on Form 10-K for the fiscal year ended March 31, 2026, filed with the Securities and Exchange Commission on June 25, 2026 and (ii) 7,767 shares of Common Stock underlying the unvested restricted stock awards reported herein.
(b)	Item 5(b) is hereby amended and restated in its entirety as follows: See rows (7) through (10) of the cover pages to this Schedule 13D for the number of shares of Common Stock as to which each Reporting Person has the sole or shared power to vote or direct the vote and sole or shared power to dispose or to direct the disposition.
(c)	Item 5(c) is hereby amended and restated in its entirety as follows: No transactions in the shares of Common Stock have been effected by the Reporting Persons during the past sixty (60) days.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Owl Creek Asset Management, L.P.

Signature:	/s/ Jeffrey A. Altman
Name/Title:	By: Owl Creek GP, L.L.C., General Partner, By: Jeffrey A. Altman, Managing Member
Date:	07/08/2026

Jeffrey A. Altman

Signature:	/s/ Jeffrey A. Altman
Name/Title:	Jeffrey A. Altman, individually
Date:	07/08/2026