ATN International (ATNI) SVP granted 10,820 PSUs and 10,820 RSUs

Rhea-AI Filing Summary

Leon Justin M reported acquisition or exercise transactions in this Form 4 filing.

ATN International, Inc. reported that SVP, Corporate Development Justin M. Leon received equity awards on common stock. He was granted 10,820 performance-based restricted stock units (PSUs) and 10,820 restricted stock units, each at no cash cost.

The time-based restricted stock units will vest in four equal installments on March 17 of 2027, 2028, 2029 and 2030, delivering an equal number of common shares as they vest. The PSUs each represent a contingent right to one common share, with actual vesting between zero and 150% of the target amount based on relative total shareholder return versus the Russell 2000 Index over a performance period from March 17, 2026 to March 17, 2029. After these grants, Leon directly holds 50,267 common shares.

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 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, CORPORATE DEVELOPMENT

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		10,820(1)	A	$0	50,267	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		10,820(2)		(3)	(3)	Common Stock	10,820	$0	10,820	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 Mr. Leon will receive a number of shares of common stock equal to the number of restricted stocks 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 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 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/ Justin M. Leon	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.
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* Form 4: SEC 1474 (03-26)

FAQ

What equity awards did ATNI grant to SVP Justin M. Leon?

ATN International granted Justin M. Leon 10,820 performance-based RSUs and 10,820 restricted stock units. Each unit represents a right to receive one share of common stock, subject to service or performance vesting conditions.

How do the performance-based RSUs for ATNI’s Justin Leon vest?

The performance-based RSUs vest based on relative total shareholder return versus the Russell 2000 Index. Between zero and 150% of the target 10,820 PSUs may vest over the performance period ending March 17, 2029.

What is the vesting schedule for Justin Leon’s time-based RSUs at ATNI?

The restricted stock units vest in four equal installments on March 17 of 2027, 2028, 2029 and 2030. On each vesting date, Justin Leon will receive shares of ATN International common stock equal to the vested units.

What performance period applies to ATNI’s new PSUs granted to Justin Leon?

The PSUs use a performance period from March 17, 2026 through March 17, 2029. Vesting depends on ATN International’s total shareholder return versus the Russell 2000 Index over that timeframe, with payout between zero and 150% of target.

How many ATNI common shares does Justin Leon hold after these grants?

Following the March 17, 2026 awards, Justin Leon directly holds 50,267 shares of ATN International common stock. This figure reflects his position after the new 10,820-share common stock-related grant recorded in the non-derivative section.

Did Justin Leon buy or sell ATNI shares in this Form 4 filing?

No open-market buys or sells occurred. The Form 4 shows grant or award acquisitions of restricted stock units and PSUs at a price of $0.00 per unit, reflecting equity compensation rather than trading activity.