X0508 4 2026-03-07 0000879585 ATN International, Inc. ATNI 0001739251 Martin Brad W C/O ATN INTERNATIONAL, INC. 500 CUMMINGS CENTER BEVERLY MA 01915 true true false false CHIEF EXECUTIVE OFFICER 0 Common Stock 2026-03-07 4 M 0 6380 A 111203 D Common Stock 2026-03-07 4 F 0 2780 24.18 D 108423 D Common Stock 2026-03-07 4 F 0 1310 24.18 D 107113 D Performance-Based Restricted Stock Units 0 2026-03-07 4 M 0 11000 0 D 2026-03-07 2026-03-07 Common Stock 11000 0 D 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. Refer to existing footnote (1). Represents shares withheld by the Company for payment of Mr. Martin's tax obligation arising from the vesting of previously granted Performance Stock Units in the existing footnote (1). Represents shares withheld by the Company for payment of Mr. Martin's tax obligations arising from the vesting of previously granted Restricted Stock Units. /s/ Brad W. Martin 2026-03-10