Michael T. Prior - 17 Mar 2026 Form 4 Insider Report for ATN International, Inc. (ATNI)

Reporting relationship: Director, EXECUTIVE CHAIRMAN
Issuer ticker: ATNI
Reported as of: 17 Mar 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 27 Mar 2026, 17:35:28 UTC
Prior SEC filing: 27 Mar 2026
Next SEC filing: 27 Mar 2026
Source filing: View source filing
Reporting owner signature: /s/ Michael T. Prior

Key filing fact

Michael T. Prior filed Form 4 for ATN International, Inc. (ATNI) on 27 Mar 2026.

Key facts

This page summarizes Michael T. Prior's Form 4 filing for ATN International, Inc. (ATNI).
2 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 27 Mar 2026, 17:35.

Change

Previous filing in this sequence was filed on 27 Mar 2026.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001244465 Primary reporting owner

PRIOR MICHAEL T

Relationship: Director, EXECUTIVE CHAIRMAN
Address: C/O ATN INTERNATIONAL, INC., 500 CUMMINGS CENTER, BEVERLY
Signature: /s/ Michael T. Prior
Signature date: 27 Mar 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

ATNI transaction

Common Stock

Award

Transaction value
Shares: +13,524
Change %: +2.3%
Price: $0.000000^*
Shares after: 590,051
Date: 17 Mar 2026
Ownership: Direct
Footnotes: F1

ATNI holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 128,847
Date: 17 Mar 2026
Ownership: Trustee of Lauren S. Prior 2013 Trust

ATNI holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 8,141
Date: 17 Mar 2026
Ownership: Trustee of JP 2018 Trust

ATNI holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 7,741
Date: 17 Mar 2026
Ownership: Trustee of WP 2015 Trust

ATNI holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 8,041
Date: 17 Mar 2026
Ownership: Trustee of RP 2014 Trust

ATNI holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 7,982
Date: 17 Mar 2026
Ownership: Trustee of Prior Family Trust 2019

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

ATNI transaction Derivative

Performance-Based Restricted Stock Units

Award

Transaction value
Shares: +13,524
Change %
Price: $0.000000^*
Shares after: 13,524
Date: 17 Mar 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 13,524
Exercise price: $0.000000
Footnotes: F2, F3

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 3 footnotes

Footnote F1

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.

Footnote F2

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.

Footnote F3

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.

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