X0609 4 2026-04-20 0000879585 ATN International, Inc. ATNI 0000922147 PRIOR CORNELIUS B JR false C/O ATN INTERNATIONAL, INC. 500 CUMMINGS CENTER BEVERLY MA 01915 true false Common Stock 2026-04-20 4 G 0 200000 0 D 3974303 D Common Stock 2026-04-20 4 G 0 200000 0 A 200000 I By VI E-Cell TropicalTelecom Ltd Common Stock 2026-05-07 4 S 0 3500 25.54 D 196500 I By VI E-Cell TropicalTelecom Ltd Common Stock 2026-05-07 4 S 0 2500 26 D 194000 I By VI E-Cell TropicalTelecom Ltd Common Stock 2026-05-08 4 S 0 1000 26.25 D 193000 I By VI E-Cell TropicalTelecom Ltd Common Stock 2026-05-11 4 S 0 5000 27.25 D 188000 I By VI E-Cell Tropical Telecom Ltd Common Stock 2026-05-14 4 S 0 2000 27.25 D 186000 I By VI E-Cell Tropical Telecom Ltd Common Stock 2026-05-20 4 S 0 3500 27.02 D 182500 I By VI E-Cell TropicalTelecom Ltd Common Stock 2026-05-21 4 S 0 2000 27.25 D 180500 I By VI E-Cell TropicalTelecom Ltd Common Stock 2026-05-26 4 S 0 2854 27.96 D 177646 I By VI E-Cell TropicalTelecom Ltd Common Stock 2026-05-27 4 S 0 17500 28.17 D 160146 I By VI E-Cell TropicalTelecom Ltd Common Stock 2026-05-27 4 G 0 30000 0 D 130146 I By VI E-Cell TropicalTelecom Ltd Common Stock 2026-05-27 4 G 0 30000 0 A 4004303 D Common Stock 2026-05-28 4 S 0 2500 28.25 D 127646 I By VI E-Cell TropicalTelecom Ltd Common Stock 2026-06-01 4 S 0 12610 28.29 D 115036 I By VI E-Cell TropicalTelecom Ltd Common Stock 2026-06-02 4 S 0 6000 28.3 D 109036 I By VI E-Cell TropicalTelecom Ltd Common Stock 2026-06-03 4 G 0 10000 0 D 3994303 D Common Stock 2026-06-11 4 S 0 2000 27.3 D 107036 I By VI E-Cell TropicalTelecom Ltd Common Stock 2026-06-12 4 S 0 19100 27.96 D 87936 I By VI E-Cell TropicalTelecom Ltd Common Stock 500 I By Wife Common Stock 8227 I By Tropical Aircraft Co This Form 4 is being filed late due to inadvertent administrative error. Represents shares transferred by the reporting person to VI E-Cell Tropical Telecom Ltd. ("VI E-Cell"), a U.S. Virgin Islands limited company that is 80% owned by the reporting person and of which the reporting person serves as the chairman. In the Form 4 filed by the reporting person on April 20, 2026, the reporting person inadvertently reported indirect beneficial ownership of 363,424 shares held as trustee of a revocable trust. Such shares are not reported on this Form 4 as they are held by a 501(c)(3) foundation and the reporting person has no pecuniary interest in such shares, and as such, have been removed from this filing to correct the prior report. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $25.00 to $25.75, 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. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $27.87 to $28.00, 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 $28.00 to $28.65, 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. Represents shares transferred by VI E-Cell to the reporting person. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $28.25 to $28.35, 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 $28.30 to $28.31, 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. Represents a bona fide gift of 10,000 shares from the reporting person to a non-profit entity. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $27.56 to $28.40, 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 2026-06-15