ATN International (ATNI) SVP nets shares after PSU and RSU vesting

Rhea-AI Filing Summary

ATN International, Inc. senior vice president of corporate development Justin M. Leon reported compensation-related equity transactions. On March 7, 2026, 5,500 performance-based restricted stock units vested and were exercised into an equal number of common shares based on pre-established relative total shareholder return goals. Following related entries, he held 42,021 common shares directly. As part of the vesting, 1,424 shares tied to performance stock units and 613 shares tied to restricted stock units were withheld by the company at $24.18 per share to cover Mr. Leon’s tax obligations, which are not open-market sales.

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^*

Leon Justin M

(Last) (First) (Middle)

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, CORPORATE DEVELOPMENT

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		3,190(1)	A	(2)	44,058	D
Common Stock	03/07/2026		F		1,424(3)	D	$24.18	42,634	D
Common Stock	03/07/2026		F		613(4)	D	$24.18	42,021	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			5,500	03/07/2026	03/07/2026	Common Stock	5,500	$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 Mr. Leon'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 Mr. Leon's tax obligation arising from the vesting of previously granted Restricted Stock Units.

	/s/ Justin M. Leon	03/10/2026
	** Signature of Reporting Person	Date
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FAQ

What insider transactions did ATN International (ATNI) report for Justin M. Leon?

ATN International reported that SVP Justin M. Leon had 5,500 performance-based restricted stock units vest and convert into common shares. Related tax-withholding transactions and other entries left him holding 42,021 common shares directly after the reported activity.

How many ATN International (ATNI) shares did Justin M. Leon hold after the Form 4 transactions?

After the reported transactions, Justin M. Leon directly owned 42,021 shares of ATN International common stock. This figure reflects the net position after performance-based unit vesting and shares withheld by the company to satisfy his tax obligations.

Were any of Justin M. Leon’s ATN International (ATNI) transactions open-market sales?

The filing shows no open-market sales. Shares coded as “F” represent 1,424 and 613 shares withheld by ATN International at $24.18 per share to pay Mr. Leon’s tax liabilities from vesting equity awards, not discretionary market sales.

What performance conditions triggered Justin M. Leon’s ATN International (ATNI) PSU vesting?

The performance-based units vested based on ATN International’s total shareholder return compared with the Russell 2000 Index. The company used 40-day average closing prices at the start and end of the performance period ending March 7, 2026, and issued 58% of the target PSU shares.

How many ATN International (ATNI) shares were withheld for Justin M. Leon’s taxes?

A total of 2,037 ATN International common shares were withheld for taxes. This included 1,424 shares related to performance stock unit vesting and 613 shares related to restricted stock unit vesting, both withheld by the company at $24.18 per share.