Anterix CFO Elena Marquez sells 4,981 shares

Anterix’s CFO exercised options that vest and become exercisable in three equal annual installments beginning October 4, 2025.

Rhea-AI Filing Summary

Anterix Inc. Chief Financial Officer Elena Marquez exercised options to acquire 1,227 common shares at $40 per share on October 9, 2026, and sold 4,981 shares that day under a Rule 10b5-1 trading plan adopted June 22, 2026. The sales were 3,254 shares at a weighted average price of $80.1627, 400 at a weighted average price of $81.8000, 100 at $82.5000, 1,017 at a weighted average price of $80.2247, and 210 at a weighted average price of $81.8993.

Insider Trade Summary 10b5-1

Exercise and sale activity reported; no spread calculated

Exercise and Sale 7 txns

Insider Marquez Elena

Role Chief Financial Officer

Sold 4,981 shs ($401K)

Approx. gross sale proceeds $401K

Approx. exercise cost $49K

Type	Security	Shares	Price	Value
Exercise	Stock Option (Right to Buy) F5	1,227	$0.00	$0.00
Sale	Common Stock F1, F2	3,254	$80.1627	$261K
Sale	Common Stock F1, F3	400	$81.80	$33K
Sale	Common Stock F1	100	$82.50	$8K
Exercise	Common Stock	1,227	$40.00	$49K
Sale	Common Stock F1, F2	1,017	$80.2247	$82K
Sale	Common Stock F1, F4	210	$81.8993	$17K

Holdings After Transaction: Stock Option (Right to Buy) — 1,227 contracts (Direct); Common Stock — 12,604 shares (Direct)

Footnotes (5)

1. F1. The sale of shares was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 22, 2026.
2. F2. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $80.00 to $80.53, 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.
3. F3. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $81.45 to $82.00, 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.
4. F4. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $81.765 to $82.00, 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.
5. F5. The option shares vest and become exercisable in three equal annual installments beginning on October 4, 2025

Key Figures

Common shares acquired through option exercise: 1,227 shares Exercise price: $40 per share Common shares sold: 4,981 shares +5 more

8 metrics

Common shares acquired through option exercise 1,227 shares October 9, 2026

Exercise price $40 per share Options exercised October 9, 2026

Common shares sold 4,981 shares October 9, 2026

Shares sold; weighted average price 3,254 shares; $80.1627 per share October 9, 2026

Shares sold; weighted average price 400 shares; $81.8000 per share October 9, 2026

Shares sold; price 100 shares; $82.5000 per share October 9, 2026

Shares sold; weighted average price 1,017 shares; $80.2247 per share October 9, 2026

Shares sold; weighted average price 210 shares; $81.8993 per share October 9, 2026

Key Terms

Rule 10b5-1 trading plan, weighted average price, Stock Option (Right to Buy)

3 terms

Rule 10b5-1 trading plan financial

"pursuant to a Rule 10b5-1 trading plan"

A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.

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.

Stock Option (Right to Buy) financial

"Stock Option (Right to Buy)"

FAQ

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

How many ATEX shares did CFO Elena Marquez sell, and at what prices?

Elena Marquez sold 4,981 shares on October 9, 2026, in five reported lots: 3,254 shares at a weighted average price of $80.1627, 400 at a weighted average price of $81.8000, 100 at $82.5000, 1,017 at a weighted average price of $80.2247, and 210 at a weighted average price of $81.8993. The sales were made under a Rule 10b5-1 trading plan adopted June 22, 2026.

What were the terms of the ATEX options Elena Marquez exercised?

The options had an exercise price of $40 per share. The option shares vest and become exercisable in three equal annual installments beginning October 4, 2025, and the options expire April 3, 2035.

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

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Available on EDGAR 10/13/2026 - 07:57 AM EDT Accepted by SEC EDGAR 10/13/2026 - 07:57 AM EDT 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).

X

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^*

Marquez Elena

(Last) (First) (Middle)

3 GARRET MOUNTAIN PLAZA, SUITE 401

(Street)

WOODLAND PARK NEW JERSEY 07424

(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)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
10/09/2026

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	10/09/2026		S(1)		3,254	D	$80.1627(2)	13,104	D
Common Stock	10/09/2026		S(1)		400	D	$81.8(3)	12,704	D
Common Stock	10/09/2026		S(1)		100	D	$82.5	12,604	D
Common Stock	10/09/2026		M		1,227	A	$40	13,831	D
Common Stock	10/09/2026		S(1)		1,017	D	$80.2247(2)	12,814	D
Common Stock	10/09/2026		S(1)		210	D	$81.8993(4)	12,604	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
Stock Option (Right to Buy)	$40	10/09/2026		M			1,227	(5)	04/03/2035	Common Stock	1,227	$0	1,227	D

Explanation of Responses:

1. The sale of shares was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 22, 2026.

2. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $80.00 to $80.53, 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.

3. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $81.45 to $82.00, 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.

4. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $81.765 to $82.00, 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.

5. The option shares vest and become exercisable in three equal annual installments beginning on October 4, 2025

Remarks:

	/s/ Gena L. Ashe, Attorney-in-Fact	10/09/2026
	** 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)