ATN International (NASDAQ: ATNI) SVP reports 3,319 shares withheld for RSU tax

Rhea-AI Filing Summary

ATN International, Inc. senior vice president and general counsel Mary Mabey reported routine share dispositions related to tax withholding. On March 12 and 13, a total of 3,319 shares of common stock were withheld by the company to satisfy tax obligations from vesting restricted stock units. Following these transactions, she directly held 53,653 shares of common stock. These were not open-market sales but mechanical tax payments tied to equity compensation.

Insights

Equity compensation analyst

Routine tax withholding from RSU vesting; no open-market trading signal.

The transactions involve F-code dispositions, which represent shares withheld to cover tax obligations when restricted stock units vest. A total of 3,319 shares of ATN International common stock were withheld on March 12 and 13.

Because the company withholds shares instead of the executive selling them in the market, these events are administrative and compensation-related rather than active investment decisions. After the withholding, Mary Mabey still directly holds 53,653 shares, indicating she retains a substantial equity stake.

Such tax-withholding entries are common for senior executives receiving stock-based pay and typically do not carry a directional signal about future performance. Subsequent company filings may provide further detail on additional RSU vesting or equity grants over time.

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

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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 MA 01915

(City) (State) (Zip)

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

3. Date of Earliest Transaction (Month/Day/Year)
03/12/2026

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

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

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

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	03/12/2026		F(1)		1,122	D	$24.65	55,850	D
Common Stock	03/13/2026		F(2)		2,197	D	$24.19	53,653	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. Represents shares withheld by the Company for payment of Ms. Mabey's tax obligation arising from the vesting of previously granted Restricted Stock Units.

2. Refer to existing footnote (1).

	/s/ Mary Mabey	03/16/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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FAQ

What did ATNI executive Mary Mabey report in this Form 4 filing?

Mary Mabey reported company share withholdings to cover taxes from vesting restricted stock units. The filing shows F-code transactions where ATN International withheld common shares instead of cash for her tax obligations tied to equity compensation.

How many ATNI shares were withheld for Mary Mabey’s tax obligations?

A total of 3,319 ATN International common shares were withheld for taxes. This includes 1,122 shares on March 12 at $24.65 per share and 2,197 shares on March 13 at $24.19 per share, all classified as tax-withholding dispositions.

Were Mary Mabey’s ATNI transactions open-market sales or routine withholdings?

They were routine tax withholdings, not open-market sales. The Form 4 uses transaction code F and footnotes explain the shares were retained by the company to pay Ms. Mabey’s tax obligations from previously granted restricted stock units vesting.

How many ATNI shares does Mary Mabey hold after these transactions?

After the reported tax-withholding transactions, Mary Mabey directly holds 53,653 shares of ATN International common stock. This figure, disclosed in the Form 4, reflects her remaining equity position following the March 13, 2026 tax-withholding disposition entry.

What is the significance of transaction code F in the ATNI Form 4?

Transaction code F indicates disposition of shares to pay an exercise price or tax liability. In this ATN International filing, it confirms the company withheld shares from Mary Mabey’s vested restricted stock units to satisfy her tax obligations instead of her selling shares on the market.

Why were ATNI restricted stock units mentioned in Mary Mabey’s Form 4 footnotes?

The footnotes explain that the withheld shares arose from vesting previously granted restricted stock units. When RSUs vest, income taxes become due, and companies like ATN International often withhold a portion of shares to pay those taxes directly on the executive’s behalf.