Anterix director sells 46,400 shares near $90

Anterix Inc. (ATEX) director William Heard, through entities associated with Heard Capital LLC, reported a sale of 46,400 shares of Common Stock on 2026-08-14.

Rhea-AI Filing Summary

Anterix Inc. (ATEX) director William Heard, through entities associated with Heard Capital LLC, reported a sale of 46,400 shares of Common Stock on 2026-08-14. The weighted average sale price was $90.1098 per share, with individual trades executed between $89.9942 and $90.115. After this transaction, investment funds and/or accounts for which Heard Capital LLC serves as investment manager held 1,670,338 shares reported as indirect ownership, and 9,365 shares were reported as directly owned. The reporting person and Heard Capital LLC each disclaim beneficial ownership of these securities for Section 16 purposes except to the extent of pecuniary interest.

Insider Trade Summary

Net Seller: 46,400 shares

Net Sell 2 txns

Insider Heard William

Role Director

Sold 46,400 shs ($4.18M)

Type	Security	Shares	Price	Value
Sale	Common Stock F1, F2	46,400	$90.1098	$4.18M
holding	Common Stock, par value $0.0001 per share ("Common Stock")	--	--	--

Holdings After Transaction: Common Stock — 1,670,338 shares (Indirect, By Heard Capital LLC); Common Stock, par value $0.0001 per share ("Common Stock") — 9,365 shares (Direct)

Footnotes (2)

1. F1. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $89.9942 to $90.115, 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.
2. F2. These securities are held by certain investment funds and/or accounts for which Heard Capital LLC serves as investment manager. The Reporting Person is the ultimate beneficial owner of Heard Capital LLC. Each of Heard Capital LLC and the Reporting Person disclaims beneficial ownership of the securities to which this filing relates for purposes of Section 16 of the Securities and Exchange Act of 1934, as amended, except to the extent of his or its pecuniary interest therein.

Key Figures

Shares sold: 46,400 shares Weighted average sale price: $90.1098 per share Sale price range: $89.9942–$90.115 per share +2 more

5 metrics

Shares sold 46,400 shares Common Stock sale on 2026-08-14 by entities managed by Heard Capital LLC

Weighted average sale price $90.1098 per share Average price for 46,400 ATEX shares sold on 2026-08-14

Sale price range $89.9942–$90.115 per share Range of prices for the multiple transactions comprising the reported sale

Indirect holdings after transaction 1,670,338 shares ATEX Common Stock held indirectly via funds/accounts managed by Heard Capital LLC

Direct holdings after transaction 9,365 shares ATEX Common Stock reported as directly owned by the reporting person

Key Terms

weighted average price, beneficial ownership, pecuniary interest, Section 16 of the Securities Exchange Act of 1934

4 terms

weighted average price financial

"The price reported in Column 4 is a weighted average price."

Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.

beneficial ownership financial

"Each of Heard Capital LLC and the Reporting Person disclaims beneficial ownership"

Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.

pecuniary interest financial

"except to the extent of his or its pecuniary interest therein."

Section 16 of the Securities Exchange Act of 1934 regulatory

"for purposes of Section 16 of the Securities and Exchange Act of 1934"

A provision of federal securities law that requires company insiders—directors, officers and large shareholders—to publicly report their stock holdings and trades and to surrender any “short-swing” profits from purchases and sales within a six-month window. It acts like a rule that forces leaders to announce their trades and prevents quick buy-sell windfalls, giving investors transparency into insider activity and reducing opportunities for unfair gain.

FAQ

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

What insider transaction did ATEX director William Heard report on this Form 4?

The filing reports a sale of 46,400 shares of Anterix Inc. (ATEX) Common Stock on 2026-08-14 at a weighted average price of $90.1098 per share, executed in multiple transactions within a narrow price range.

At what prices were the ATEX shares sold in William Heard’s reported transaction?

The 46,400 ATEX shares were sold at a weighted average price of $90.1098, in multiple trades at prices ranging from $89.9942 to $90.115, inclusive, as disclosed in the transaction footnote.

How many Anterix (ATEX) shares does William Heard’s associated entities hold after this sale?

After the reported sale, investment funds and/or accounts managed by Heard Capital LLC held 1,670,338 indirectly owned shares of ATEX, and 9,365 shares were reported as directly owned following the transaction on 2026-08-14.

Who actually holds the Anterix (ATEX) shares involved in William Heard’s Form 4 filing?

The securities are held by certain investment funds and/or accounts for which Heard Capital LLC serves as investment manager. The reporting person is the ultimate beneficial owner of Heard Capital LLC but disclaims beneficial ownership except for any pecuniary interest.

Was William Heard’s ATEX share sale made under a Rule 10b5-1 trading plan?

The filing’s Rule 10b5-1 checkbox is not marked as relying on a plan, and the footnotes do not state that the transactions were made pursuant to any Rule 10b5-1 or similar pre-arranged trading plan.

What type of ownership does William Heard report for his ATEX holdings?

The 1,670,338 ATEX shares are reported as indirectly owned through investment funds/accounts managed by Heard Capital LLC, while 9,365 shares are reported as directly owned by the reporting person as of the transaction date.

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

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Available on EDGAR 08/18/2026 - 05:38 PM Accepted by SEC EDGAR 08/18/2026 - 05:38 PM Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Heard William

(Last) (First) (Middle)

C/O HEARD CAPITAL LLC

1 N. WACKER DRIVE, SUITE 3650

(Street)

CHICAGO ILLINOIS 60606

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Anterix Inc. [ ATEX ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/14/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	08/14/2026		S		46,400	D	$90.1098(1)	1,670,338	I	By Heard Capital LLC(2)
Common Stock, par value $0.0001 per share ("Common Stock")								9,365	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $89.9942 to $90.115, 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.

2. These securities are held by certain investment funds and/or accounts for which Heard Capital LLC serves as investment manager. The Reporting Person is the ultimate beneficial owner of Heard Capital LLC. Each of Heard Capital LLC and the Reporting Person disclaims beneficial ownership of the securities to which this filing relates for purposes of Section 16 of the Securities and Exchange Act of 1934, as amended, except to the extent of his or its pecuniary interest therein.

Remarks:

	s/ Gena L. Ashe, Attorney-in-Fact	08/18/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)