COMMITMENTS AND CONTINGENCIES	3 Months Ended
Mar. 31, 2026
COMMITMENTS AND CONTINGENCIES
COMMITMENTS AND CONTINGENCIES	14. COMMITMENTS AND CONTINGENCIES Regulatory and Litigation Matters The Company and its subsidiaries are subject to certain regulatory and legal proceedings and other claims arising in the ordinary course of business, some of which involve claims for damages and taxes that are substantial in amount. Historically, the Company’s subsidiary, OneGY, has been subject to other long-standing litigation proceedings and disputes in Guyana that have not yet been resolved. It has been OneGY’s practice to make payments of undisputed spectrum and license fees as amounts are invoiced by the Telecommunications Authority (“TA”) and to accrue for a reasonable determination of any amounts that are disputed or not invoiced by the TA. The Company believes that, except for the items discussed below, for which the Company is currently unable to predict the final outcome, the disposition of matters currently pending, individually or in the aggregate, will not have a material adverse effect on the Company’s financial position or results of operations. Since 2006, the National Frequency Management Unit (now the TA, or the “NFMU”) and OneGY have been engaged in discussions regarding the amount of and methodology for calculation of spectrum fees payable by OneGY in Guyana. Since that time, OneGY has made payments of undisputed spectrum, license and other fees when invoiced by the NFMU, and to its successor, the TA. OneGY continues to dispute in good faith the methodology used for calculation and has requested further clarification on the subject of a revised spectrum fee methodology from the TA. OneGY has filed several lawsuits in the High Court of Guyana (the “High Court”) asserting that, despite its denials, Digicel is engaged in international bypass in violation of OneGY’s exclusive license rights, the interconnection agreement between the parties, and the laws of Guyana. Digicel filed counterclaims alleging that OneGY has violated the terms of the interconnection agreement and Guyana laws. These suits, filed in 2010 and 2012, are currently pending in the Court of Appeals in Guyana; however, as of the date of this Report, the Company cannot accurately predict when the consolidated suit will reach a court of final determination. OneGY is also involved in several legal claims regarding its tax filings with the Guyana Revenue Authority (the “GRA”) dating back to 1991 regarding the deductibility of intercompany advisory fees as well as other tax assessments. OneGY has maintained that it has no unpaid corporation tax due to the GRA and that any liability OneGY might be found to have with respect to the disputed tax assessments would be offset in part by the amounts claimed with respect to rights ATN has pursuant to its agreement with the government of Guyana. OneGY’s position has been upheld by various High Court rulings made in its favor, and while all matters have been appealed by the GRA, as of the date of this Report, only one remained pending for determination by the High Court. The Regulatory Authority of Bermuda (the “RA”) is the primary regulator of the Company’s operations in Bermuda. On August 28, 2025, the RA completed a market review and determined that the Company has significant market power in certain broadband and mobile services. In connection therewith, the RA assessed, and the Company has initiated an appeal of, a series of ex-ante remedies that include wholesale obligations, price caps, and reporting obligations in addition to the ex post competition rules that generally apply. In October 2025, the Company was able to obtain a stay of implementation of these ex-ante remedies pending the Bermuda Supreme Court’s review of its appeal of the RA’s market review determination. The ex-ante remedies are burdensome and, if implemented, will require financial, operational, legal and regulatory resources to be allocated to ensure compliance. With respect to all of the foregoing unresolved matters, the Company believes that some adverse outcome is probable and has accordingly accrued $17.4 million as of March 31, 2026 for these and other potential liabilities arising in various claims, legal actions and regulatory proceedings arising in the ordinary course of business. The Company also faces contingencies that are reasonably possible to occur that cannot currently be estimated. It is the Company’s policy to expense costs associated with loss contingencies, including any related legal fees, as they are incurred.

COMMITMENTS AND CONTINGENCIES

3 Months Ended

Mar. 31, 2026

14. COMMITMENTS AND CONTINGENCIES

Regulatory and Litigation Matters

The Company and its subsidiaries are subject to certain regulatory and legal proceedings and other claims arising in the ordinary course of business, some of which involve claims for damages and taxes that are substantial in amount. Historically, the Company’s subsidiary, OneGY, has been subject to other long-standing litigation proceedings and disputes in Guyana that have not yet been resolved. It has been OneGY’s practice to make payments of undisputed spectrum and license fees as amounts are invoiced by the Telecommunications Authority (“TA”) and to accrue for a reasonable determination of any amounts that are disputed or not invoiced by the TA. The Company believes that,

except for the items discussed below, for which the Company is currently unable to predict the final outcome, the disposition of matters currently pending, individually or in the aggregate, will not have a material adverse effect on the Company’s financial position or results of operations.

Since 2006, the National Frequency Management Unit (now the TA, or the “NFMU”) and OneGY have been engaged in discussions regarding the amount of and methodology for calculation of spectrum fees payable by OneGY in Guyana. Since that time, OneGY has made payments of undisputed spectrum, license and other fees when invoiced by the NFMU, and to its successor, the TA. OneGY continues to dispute in good faith the methodology used for calculation and has requested further clarification on the subject of a revised spectrum fee methodology from the TA.

OneGY has filed several lawsuits in the High Court of Guyana (the “High Court”) asserting that, despite its denials, Digicel is engaged in international bypass in violation of OneGY’s exclusive license rights, the interconnection agreement between the parties, and the laws of Guyana. Digicel filed counterclaims alleging that OneGY has violated the terms of the interconnection agreement and Guyana laws. These suits, filed in 2010 and 2012, are currently pending in the Court of Appeals in Guyana; however, as of the date of this Report, the Company cannot accurately predict when the consolidated suit will reach a court of final determination.

OneGY is also involved in several legal claims regarding its tax filings with the Guyana Revenue Authority (the “GRA”) dating back to 1991 regarding the deductibility of intercompany advisory fees as well as other tax assessments. OneGY has maintained that it has no unpaid corporation tax due to the GRA and that any liability OneGY might be found to have with respect to the disputed tax assessments would be offset in part by the amounts claimed with respect to rights ATN has pursuant to its agreement with the government of Guyana. OneGY’s position has been upheld by various High Court rulings made in its favor, and while all matters have been appealed by the GRA, as of the date of this Report, only one remained pending for determination by the High Court.

The Regulatory Authority of Bermuda (the “RA”) is the primary regulator of the Company’s operations in Bermuda. On August 28, 2025, the RA completed a market review and determined that the Company has significant market power in certain broadband and mobile services. In connection therewith, the RA assessed, and the Company has initiated an appeal of, a series of ex-ante remedies that include wholesale obligations, price caps, and reporting obligations in addition to the ex post competition rules that generally apply. In October 2025, the Company was able to obtain a stay of implementation of these ex-ante remedies pending the Bermuda Supreme Court’s review of its appeal of the RA’s market review determination. The ex-ante remedies are burdensome and, if implemented, will require financial, operational, legal and regulatory resources to be allocated to ensure compliance.

With respect to all of the foregoing unresolved matters, the Company believes that some adverse outcome is probable and has accordingly accrued $17.4 million as of March 31, 2026 for these and other potential liabilities arising in various claims, legal actions and regulatory proceedings arising in the ordinary course of business. The Company also faces contingencies that are reasonably possible to occur that cannot currently be estimated. It is the Company’s policy to expense costs associated with loss contingencies, including any related legal fees, as they are incurred.