ATN International (ATNI) grants stock and performance RSUs to SVP

Rhea-AI Filing Summary

Mabey Mary reported acquisition or exercise transactions in this Form 4 filing.

ATN International, Inc. reported that SVP and General Counsel Mary Mabey received equity awards that increase her direct ownership. She was granted 12,624 shares of common stock at no cost, bringing her direct common stock holdings to 66,277 shares after the award.

Mabey also received 12,624 performance-based restricted stock units, each representing a contingent right to one share of common stock. Between zero and 150% of these PSUs may vest based on relative total shareholder return performance from March 17, 2026 through March 17, 2029. A separate restricted stock unit grant will vest in four equal installments on March 17 of 2027, 2028, 2029 and 2030.

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 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)
03/17/2026

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	03/17/2026		A		12,624(1)	A	$0	66,277	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	03/17/2026		A		12,624(2)		(3)	(3)	Common Stock	12,624	$0	12,624	D

Explanation of Responses:

1. The securities described are restricted stock units and will vest in four equal installments on each of March 17, 2027, 2028, 2029 and 2030. Upon vesting Ms. Mabey will receive a number of shares of common stock equal to the number of restricted stock units that have vested.

2. Each performance-based RSU ("PSU") represents a contingent right to receive one share of the Issuer's common stock, subject to 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 days of the applicable performance period. The aggregate number of shares issued may range from zero (0) shares to 150% of the target number of shares reported in Columns 7 and 9 of this report.

3. Between zero (0) and 150% of the PSUs will generally vest, if at all, as of the end of the performance period that begins on March 17, 2026, and ends on March 17, 2029.

	/s/ Mary Mabey	03/19/2026
	** 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)

FAQ

What equity awards did ATN International (ATNI) grant to Mary Mabey?

Mary Mabey received 12,624 shares of common stock and 12,624 performance-based restricted stock units. The common stock grant was at no cost and increased her direct holdings to 66,277 shares following the awards.

How do the performance-based RSUs for ATN International (ATNI) vest?

Each performance-based RSU can convert into one share of common stock, but only if pre-set total shareholder return goals are met versus the Russell 2000 Index over a performance period ending March 17, 2029.

What is the potential payout range for Mary Mabey’s ATNI performance RSUs?

The aggregate shares issued from the performance-based RSUs can range from zero to 150% of the 12,624 target units, depending on ATN International’s relative total shareholder return during the stated performance period.

Over what dates will Mary Mabey’s ATN International restricted stock units vest?

The time-based restricted stock units will vest in four equal installments on March 17 of 2027, 2028, 2029 and 2030, assuming continuing service and any other plan conditions are satisfied for each vesting date.

How many ATN International (ATNI) shares does Mary Mabey hold after these grants?

After the common stock grant of 12,624 shares, Mary Mabey directly holds 66,277 shares of ATN International common stock. This figure reflects her updated ownership immediately following the reported transactions.

What performance metric governs ATN International’s performance-based RSUs for Mary Mabey?

The performance-based RSUs are tied to relative total shareholder return versus the Russell 2000 Index, using average closing prices for 40 days at the beginning and end of the March 17, 2026 to March 17, 2029 performance period.