PRIOR MICHAEL T 4

4 · ATN International, Inc. · Filed Mar 27, 2026

AI-generated summary of this filing

Updated Mar 27, 2026

ATN International (ATNI) Executive Chairman Michael Prior Receives Award

What Happened

Michael T. Prior, Executive Chairman and Director of ATN International (ATNI), had equity awards vest/convert on March 7, 2026. The Form 4 reports conversion/exercise-of-derivative entries for 14,500 shares (acquired) and 25,000 shares (reported as converted/derivative, $0 proceeds).
To satisfy tax obligations on vested awards, the company withheld 6,430 shares (disposed) and 2,982 shares (disposed) at $24.18 per share, totaling $227,582 in tax-withholding. These withholding transactions are routine and reflect tax payment, not an open-market sale for cash.

Key Details

Transaction date: 2026-03-07; Form 4 filed 2026-03-27 (appears late — insiders normally must file within 2 business days).
Reported derivative/vesting entries: 14,500 shares (acquired, price N/A) and 25,000 shares (derivative converted, $0).
Shares withheld for taxes: 6,430 shares ($155,477) and 2,982 shares ($72,105) at $24.18 each; total withheld = 9,412 shares for $227,582.
Shares owned after the transaction: not specified in the provided data.
Footnotes: F1 indicates the shares arose from vested performance-based RSUs/PSUs (58% of target payout for the performance period ending Mar 7, 2026). F3 and F4 confirm the withheld shares were to pay tax obligations on vested PSUs and RSUs.

Context

These entries reflect vesting/conversion of performance and restricted stock units and routine share withholding to cover taxes (transaction codes M = exercise/conversion of derivative; F = tax withholding/payment). Withheld-share transactions are not the same as an open-market sale for investment reasons.
The late filing may draw attention but does not by itself indicate intent or trading strategy; retail investors should note the vesting is compensation-related rather than a discretionary sale by the insider.

Form 4

Period: 2026-03-07

DirectorOther

Transactions

Exercise/Conversion
Common Stock
[F1][F2]
2026-03-07+14,500→ 592,816 total
Tax Payment
Common Stock
[F3]
2026-03-07$24.18/sh−6,430$155,477→ 586,386 total
Tax Payment
Common Stock
[F4]
2026-03-07$24.18/sh−2,982$72,105→ 583,404 total
Exercise/Conversion
Performance-Based Restricted Stock Units
2026-03-07−25,000→ 0 total
Exercise: $0.00From: 2026-03-07Exp: 2026-03-07→ Common Stock (25,000 underlying)

Holdings

Footnotes (4)

[F1]Common stock issued upon vesting of performance-based RSU ("PSU") based on 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 trading days of the applicable performance period, which ended on March 7, 2026. The aggregate number of shares issued is 58% of the target number of PSU shares previously reported.
[F2]Refer to existing footnote (1)
[F3]Represents shares withheld by the Company for payment of Mr. Prior's tax obligation arising from the vesting of previously granted Performance Stock Units in the existing footnote (1).
[F4]Represents shares withheld by the Company for payment of Mr. Prior's tax obligation arising from the vesting of previously granted Restricted Stock Units.

Signature

/s/ Michael T. Prior|2026-03-27

1 file