ATN International (NASDAQ: ATNI) SVP’s PSUs vest, 2,719 shares withheld for taxes

Rhea-AI Filing Summary

ATN International SVP and general counsel Mary Mabey reported equity compensation activity tied to performance-based awards. She exercised 6,600 performance-based restricted stock units into common shares, based on relative total shareholder return goals measured against the Russell 2000 Index. The footnotes state this vesting resulted in 58% of the target PSU shares being issued for the performance period ending on March 7, 2026. Following the vesting, 1,900 and 819 common shares were withheld at $24.18 per share to cover tax obligations on the vested PSUs and previously granted restricted stock units, leaving her with 56,972 common shares held directly.

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)
03/07/2026

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	03/07/2026		M		3,828(1)	A	(2)	59,691	D
Common Stock	03/07/2026		F		1,900(3)	D	$24.18	57,791	D
Common Stock	03/07/2026		F		819(4)	D	$24.18	56,972	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
Performance-Based Restricted Stock Units	$0	03/07/2026		M			6,600	03/07/2026	03/07/2026	Common Stock	6,600	$0	0	D

Explanation of Responses:

1. Common stock issued upon vesting of performance-based RSU ("PSU") based on the achievement of pre-established relative total shareholder return ("TSR") goals that were set by the Compensation Committee of the Issuer's Board of Directors, based on comparing the Issuer's TSR relative to the TSR of the Russell 2000 Index, using the average closing price of the shares for the 40 days before and including each of the first and last trading days of the applicable performance period, which ended on March 7, 2026. The aggregate number of shares issued is 58% of the target number of PSU shares previously reported.

2. Refer to existing footnote (1).

3. Represents shares withheld by the Company for payment of Ms. Mabey's tax obligation arising from the vesting of previously granted Performance Stock Units in the existing footnote (1).

4. Represents shares withheld by the Company for payment of Ms. Mabey's tax obligation arising from the vesting of previously granted Restricted Stock Units.

	/s/ Mary Mabey	03/10/2026
	** 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).
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FAQ

What insider transactions did ATNI executive Mary Mabey report on this Form 4?

Mary Mabey reported vesting of performance-based restricted stock units converting into 6,600 common shares. She then had 1,900 and 819 common shares withheld at $24.18 per share to satisfy tax obligations, ending with 56,972 common shares directly owned.

How many ATNI shares does Mary Mabey hold after the reported transactions?

After the reported transactions, Mary Mabey directly owns 56,972 shares of ATN International common stock. This reflects the net result of performance-based RSU vesting into common shares and shares withheld by the company to cover associated tax obligations.

What type of equity awards vested for ATNI SVP and general counsel Mary Mabey?

Performance-based restricted stock units vested for Mary Mabey, converting into 6,600 common shares. These awards were tied to pre-established relative total shareholder return goals versus the Russell 2000 Index over a performance period ending on March 7, 2026.

How were the performance goals for Mary Mabey’s ATNI PSUs determined?

The performance goals were based on ATN International’s relative total shareholder return compared with the Russell 2000 Index. The Compensation Committee used average closing prices over 40 trading days at the beginning and end of the performance period ending March 7, 2026 to determine vesting.

What portion of Mary Mabey’s ATNI performance stock units ultimately vested?

The footnotes state that the aggregate number of common shares issued upon vesting of Mary Mabey’s performance-based RSUs equals 58% of the original target PSU share amount previously reported, reflecting performance against the specified relative total shareholder return goals.

Were Mary Mabey’s ATNI share dispositions open-market sales?

No, the dispositions were not open-market sales. The Form 4 shows code F transactions where 1,900 and 819 shares of common stock were withheld by ATN International solely to pay Mary Mabey’s tax obligations from vesting of PSUs and restricted stock units.