X0609 4 2026-08-17 0000879585 ATN International, Inc. ATNI 0000922147 PRIOR CORNELIUS B JR false C/O ATN INTERNATIONAL, INC. 500 CUMMINGS CENTER BEVERLY MA 01915 false false true false 0 Common Stock 2026-08-17 4 S 0 5745 31.7931 D 58665 I By VI E-Cell Tropical Telecom Ltd Common Stock 2026-08-18 4 S 0 1000 31.75 D 57665 I By VI E-Cell Tropical Telecom Ltd Common Stock 3982303 D Common Stock 500 I By: Wife Common Stock 8227 I By Tropical Aircraft Co. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $31.5217 to $32.200040, inclusive. The reporting person undertakes to provide to ATN International, Inc., any security holder of ATN International, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $31.75 to $31.75, inclusive. The reporting person undertakes to provide to ATN International, Inc., any security holder of ATN International, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote. /s/ Andy Fienberg , Attorney-in-Fact 2026-08-19