X0306 4 2018-06-13 0 0000879585 ATN International, Inc. ATNI 0001244465 PRIOR MICHAEL T C/O ATN INTERNATIONAL, INC. 500 CUMMINGS CENTER BEVERLY MA 01915 1 1 0 0 President and CEO Common Stock 2018-06-13 4 S 0 800 53.38 D 8541 I Trustee of RP 2014 Trust Common Stock 2018-06-13 4 S 0 800 53.38 D 7741 I Trustee of WP 2015 Trust Common Stock 2018-06-13 4 S 0 800 53.38 D 8141 I By Child Common Stock 144647 I Trustee of Lauren S. Prior 2013 Trust Common Stock 402624 D These transactions were executed in multiple trades at prices ranging from $53.24 to $53.50. The price reported reflects the average weighted sale price. Full information regarding the number of shares sold and the prices at which the transactions were effected is available to the SEC staff, the issuer or any security holder of the issuer, upon request. /s/ Michael T. Prior 2018-06-15