ATN International insider sells 5,000 shares

ATN International, Inc. executive Mary Mabey, SVP and General Counsel, reported a sale of 5,000 shares of common stock on 2026-08-10 at $32.125 per share in a sale described as an open market or private transaction.

Rhea-AI Filing Summary

ATN International, Inc. executive Mary Mabey, SVP and General Counsel, reported a sale of 5,000 shares of common stock on 2026-08-10 at $32.125 per share in a sale described as an open market or private transaction. Following this trade, she directly holds 60,402 shares of ATN International common stock. The Rule 10b5-1 trading plan checkbox was not marked.

Insider Trade Summary

Net Seller: 5,000 shares

Net Sell 1 txn

Insider Mabey Mary

Role SVP AND GENERAL COUNSEL

Sold 5,000 shs ($161K)

Type	Security	Shares	Price	Value
Sale	Common Stock	5,000	$32.125	$161K

Holdings After Transaction: Common Stock — 60,402 shares (Direct)

Key Figures

Shares sold: 5,000 shares Sale price per share: $32.125 per share Shares owned after transaction: 60,402 shares

3 metrics

Shares sold 5,000 shares Common stock sale reported for 2026-08-10

Sale price per share $32.125 per share Price for the 5,000 common shares sold

Shares owned after transaction 60,402 shares Directly held common shares following the sale

Key Terms

Sale in open market or private transaction, direct ownership, Rule 10b5-1

3 terms

Sale in open market or private transaction market

"Transaction code S is described as a "Sale in open market or private transaction""

direct ownership financial

"The ownership_type is listed as direct, indicating direct ownership of the shares"

Rule 10b5-1 regulatory

"The Rule 10b5-1 trading plan checkbox (aff_10b5_one) was not selected"

Rule 10b5-1 is a regulation that allows company insiders to buy or sell their shares at predetermined times, even if they have access to non-public information. It acts like setting a schedule in advance for transactions, helping prevent accusations of unfair trading. This rule provides a way for insiders to plan trades transparently, giving investors confidence that these transactions are not based on hidden information.

FAQ

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

What insider transaction did ATNI executive Mary Mabey report?

Mary Mabey reported selling 5,000 shares of ATN International common stock on 2026-08-10 at $32.125 per share. After this open market or private transaction, she directly owns 60,402 shares of ATNI common stock.

At what price were the 5,000 ATNI shares sold by Mary Mabey?

The reported sale was executed at an average price of $32.125 per share. This price applies to the 5,000 common shares sold in the transaction dated 2026-08-10, as disclosed in the insider trading report.

How many ATNI shares does Mary Mabey own after the reported sale?

After the transaction, Mary Mabey directly owns 60,402 shares of ATN International common stock. This holding reflects her position immediately following the 5,000-share sale reported for the trade date 2026-08-10.

Was Mary Mabey’s ATNI stock sale under a Rule 10b5-1 trading plan?

The Rule 10b5-1 checkbox in the report was not checked, indicating no affirmation that the trade was made under a Rule 10b5-1 trading plan. The filing characterizes the transaction as an open market or private sale.

What role does Mary Mabey hold at ATN International (ATNI)?

Mary Mabey is reported as an officer of ATN International, serving as Senior Vice President (SVP) and General Counsel. Her Form 4 filing discloses personal trading activity in the company’s common stock in that executive capacity.

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

Form 4 Insider Transactions: What Each Field Means →

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Available on EDGAR 08/11/2026 - 03:02 PM Accepted by SEC EDGAR 08/11/2026 - 03:01 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^*

Mabey Mary

(Last) (First) (Middle)

C/O ATN INTERNATIONAL, INC.

500 CUMMINGS CENTER, SUITE 2450

(Street)

BEVERLY MASSACHUSETTS 01915

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
ATN International, Inc. [ ATNI ]

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

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	SVP AND GENERAL COUNSEL

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/10/2026

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	08/10/2026		S		5,000	D	$32.125	60,402	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:

	/s/ Mary Mabey	08/11/2026
	** 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)