ATNI · ATN International, Inc.

Represents fully vested shares of restricted stock grant pursuant to the Issuer's 2023 Equity Incentive Plan in payment of Ms Lenehan's 2026 annual director retainer based on the moving average price for the past twenty days of $27.15 of the Issuer's common stock as of June 12, 2026.

Represents fully vested shares of restricted stock grant pursuant to the Issuer's 2023 Equity Incentive Plan in payment of Ms. Henry's 2026 annual director retainer based on the moving average price for the past twenty days of $27.15 of the Issuer's common stock as of June 12, 2026.

Represents fully vested shares of restricted stock grant pursuant to the Issuer's 2023 Equity Incentive Plan in payment of Ms. Jacobs' 2026 annual director retainer based on the moving average price for the past twenty days of $27.15 of the Issuer's common stock as of June 12, 2026.

Represents shares withheld by the Company for payment of Mr. Hudson's tax obligations.

Represents fully vested shares of restricted stock grant pursuant to the Issuer's 2023 Equity Incentive Plan in payment of Mr. Bulkin's 2026 annual director retainer based on the moving average price for the past twenty days of $27.15 of the Issuer's common stock as of June 12, 2026.

Represents fully vested shares of restricted stock grant pursuant to the Issuer's 2023 Equity Incentive Plan in payment of Mr. Hudson's 2026 annual director retainer based on the moving average price for the past twenty days of $27.15 of the Issuer's common stock as of June 12, 2026.

Represents fully vested shares of restricted stock grant pursuant to the Issuer's 2023 Equity Incentive Plan in payment of Ms. Henry's 2026 annual director retainer based on the moving average price for the past twenty days of $27.15 of the Issuer's common stock as of June 12, 2026.

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.

This Form 4 is being filed late due to inadvertent administrative error.

Represents a bona fide gift of 10,000 shares from the reporting person to a non-profit entity.

This Form 4 is being filed late due to inadvertent administrative error.

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.

This Form 4 is being filed late due to inadvertent administrative error.

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.

This Form 4 is being filed late due to inadvertent administrative error.

This Form 4 is being filed late due to inadvertent administrative error.

Represents shares transferred by VI E-Cell to the reporting person.

This Form 4 is being filed late due to inadvertent administrative error.

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.

This Form 4 is being filed late due to inadvertent administrative error.

Represents shares transferred by VI E-Cell to the reporting person.

This Form 4 is being filed late due to inadvertent administrative error.

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.

This Form 4 is being filed late due to inadvertent administrative error.

This Form 4 is being filed late due to inadvertent administrative error.

This Form 4 is being filed late due to inadvertent administrative error.

This Form 4 is being filed late due to inadvertent administrative error.

This Form 4 is being filed late due to inadvertent administrative error.

This Form 4 is being filed late due to inadvertent administrative error.

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.

This Form 4 is being filed late due to inadvertent administrative error.

Each performance-based RSU ("PSU") represents a contingent right to receive one share of the Issuer's common stock, subject to 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 days of the applicable performance period. The aggregate number of shares issued may range from zero (0) shares to 150% of the target number of shares reported in Columns 7 and 9 of this report.

Between zero (0) and 150% of the PSUs will generally vest, if at all, as of the end of the performance period that begins on March 17, 2026, and ends on March 16, 2029.

The securities described are restricted stock units and will vest in four equal installments on each of April 24, 2027, 2028, 2029 and 2030. Upon vesting Mr. Khoury will receive a number of shares of common stock equal to the number of restricted stock units that have vested.

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.

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.

Represents shares withheld by the Company for payment of Mr. Leon's tax obligation arising from the vesting of previously granted Restricted Stock Units.

Represents shares withheld by the Company for payment of Mr. Prior's tax obligation arising from the vesting of previously granted Restricted Stock Units.

Represents shares withheld by the Company for payment of Ms. Mabey's tax obligation arising from the vesting of previously granted Restricted Stock Units.

Represents shares withheld by the Company for payment of Mr. Martin's tax obligations arising from the vesting of previously granted Restricted Stock Units.

Each performance-based RSU ("PSU") represents a contingent right to receive one share of the Issuer's common stock, subject to 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 days of the applicable performance period. The aggregate number of shares issued may range from zero (0) shares to 150% of the target number of shares reported in columns 7 and 9 of this report.

Between zero (0) and 150% of the PSUs will generally vest, if at all, as of the end of the performance period that begins on March 17, 2026, and ends on March 17, 2029.

The securities described are restricted stock units and will vest in four equal installments on each of March 17, 2027, 2028, 2029 and 2030. Upon vesting Mr. Leon will receive a number of shares of common stock equal to the number of restricted stocks units that have vested.

Each performance-based RSU ("PSU") represents a contingent right to receive one share of the Issuer's common stock, subject to 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 days of the applicable performance period. The aggregate number of shares issued may range from zero (0) shares to 150% of the target number of shares reported in columns 7 and 9 of this report.

Between zero (0) and 150% of the PSUs will generally vest, if at all, as of the end of the performance period that begins on March 17, 2026, and ends on March 17, 2029.

The securities described are restricted stock units and will fest in four equal installments on each of March 17, 2027, 2028, 2029 and 2030. Upon vesting Mr. Prior will receive a number of shares of common stock equal to the number of restricted stocks units that have vested.

Each performance-based RSU ("PSU") represents a contingent right to receive one share of the Issuer's common stock, subject to 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 days of the applicable performance period. The aggregate number of shares issued may range from zero (0) shares to 150% of the target number of shares reported in columns 7 and 9 of this report.

Between zero (0) and 150% of the PSUs will generally vest, if at all, as of the end of the performance period that begins on March 17, 2026, and ends on March 17, 2029.

The securities described are restricted stock units and will vest in four equal installments on each of March 17, 2027, 2028, 2029 and 2030. Upon vesting, Mr. Martin will receive a number of shares of common stock equal to the number of restricted stock units that have vested.

Each performance-based RSU ("PSU") represents a contingent right to receive one share of the Issuer's common stock, subject to 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 days of the applicable performance period. The aggregate number of shares issued may range from zero (0) shares to 150% of the target number of shares reported in Columns 7 and 9 of this report.

Between zero (0) and 150% of the PSUs will generally vest, if at all, as of the end of the performance period that begins on March 17, 2026, and ends on March 17, 2029.

The securities described are restricted stock units and will vest in four equal installments on each of March 17, 2027, 2028, 2029 and 2030. Upon vesting, Mr. Doglioli will receive a number of shares of common stock equal to the number of restricted stock units that have vested.