Cornelius B. Prior Jr. - 20 Apr 2026 Form 4 Insider Report for ATN International, Inc. (ATNI)

Reporting relationship: 10%+ Owner
Issuer ticker: ATNI
Reported as of: 20 Apr 2026
Net transaction value: -$2,279,031
SEC form: 4
Accepted by SEC: 15 Jun 2026, 21:56:57 UTC
Prior SEC filing: 20 Apr 2026
Next SEC filing: 29 Jun 2026
Source filing: View source filing
Reporting owner signature: /s/ Andy Fienberg, Attorney-in-Fact

Key filing fact

Cornelius B. Prior Jr. filed Form 4 for ATN International, Inc. (ATNI) on 15 Jun 2026.

Key facts

This page summarizes Cornelius B. Prior Jr.'s Form 4 filing for ATN International, Inc. (ATNI).
19 reported transactions and 0 derivative rows are listed below.
Accepted by SEC: 15 Jun 2026, 21:56.

Change

Previous filing in this sequence was filed on 20 Apr 2026.
Current net transaction value: -$2,279,031.

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 0000922147 Primary reporting owner

PRIOR CORNELIUS B JR

Relationship: 10%+ Owner
Address: C/O ATN INTERNATIONAL, INC., 500 CUMMINGS CENTER, BEVERLY
Signature: /s/ Andy Fienberg, Attorney-in-Fact
Signature date: 15 Jun 2026

Reported non-derivative transactions

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

ATNI transaction

Common Stock

Gift

Transaction value
Shares: -200,000
Change %: -4.8%
Price: $0.000000^*
Shares after: 3,974,303
Date: 20 Apr 2026
Ownership: Direct
Footnotes: F1, F2, F3

ATNI transaction

Common Stock

Gift

Transaction value
Shares: +200,000
Change %
Price: $0.000000^*
Shares after: 200,000
Date: 20 Apr 2026
Ownership: By VI E-Cell TropicalTelecom Ltd
Footnotes: F1, F2

ATNI transaction

Common Stock

Sale

Transaction value: $89,390
Shares: -3,500
Change %: -1.8%
Price: $25.54
Shares after: 196,500
Date: 07 May 2026
Ownership: By VI E-Cell TropicalTelecom Ltd
Footnotes: F1, F4

ATNI transaction

Common Stock

Sale

Transaction value: $65,000
Shares: -2,500
Change %: -1.3%
Price: $26.00
Shares after: 194,000
Date: 07 May 2026
Ownership: By VI E-Cell TropicalTelecom Ltd
Footnotes: F1

ATNI transaction

Common Stock

Sale

Transaction value: $26,250
Shares: -1,000
Change %: -0.52%
Price: $26.25
Shares after: 193,000
Date: 08 May 2026
Ownership: By VI E-Cell TropicalTelecom Ltd
Footnotes: F1

ATNI transaction

Common Stock

Sale

Transaction value: $136,250
Shares: -5,000
Change %: -2.6%
Price: $27.25
Shares after: 188,000
Date: 11 May 2026
Ownership: By VI E-Cell Tropical Telecom Ltd
Footnotes: F1

ATNI transaction

Common Stock

Sale

Transaction value: $54,500
Shares: -2,000
Change %: -1.1%
Price: $27.25
Shares after: 186,000
Date: 14 May 2026
Ownership: By VI E-Cell Tropical Telecom Ltd
Footnotes: F1

ATNI transaction

Common Stock

Sale

Transaction value: $94,570
Shares: -3,500
Change %: -1.9%
Price: $27.02
Shares after: 182,500
Date: 20 May 2026
Ownership: By VI E-Cell TropicalTelecom Ltd
Footnotes: F1

ATNI transaction

Common Stock

Sale

Transaction value: $54,500
Shares: -2,000
Change %: -1.1%
Price: $27.25
Shares after: 180,500
Date: 21 May 2026
Ownership: By VI E-Cell TropicalTelecom Ltd
Footnotes: F1

ATNI transaction

Common Stock

Sale

Transaction value: $79,798
Shares: -2,854
Change %: -1.6%
Price: $27.96
Shares after: 177,646
Date: 26 May 2026
Ownership: By VI E-Cell TropicalTelecom Ltd
Footnotes: F1, F5

ATNI transaction

Common Stock

Sale

Transaction value: $492,975
Shares: -17,500
Change %: -9.9%
Price: $28.17
Shares after: 160,146
Date: 27 May 2026
Ownership: By VI E-Cell TropicalTelecom Ltd
Footnotes: F1, F6

ATNI transaction

Common Stock

Gift

Transaction value
Shares: -30,000
Change %: -19%
Price: $0.000000^*
Shares after: 130,146
Date: 27 May 2026
Ownership: By VI E-Cell TropicalTelecom Ltd
Footnotes: F1, F7

ATNI transaction

Common Stock

Gift

Transaction value
Shares: +30,000
Change %: +0.75%
Price: $0.000000^*
Shares after: 4,004,303
Date: 27 May 2026
Ownership: Direct
Footnotes: F1, F7

ATNI transaction

Common Stock

Sale

Transaction value: $70,625
Shares: -2,500
Change %: -1.9%
Price: $28.25
Shares after: 127,646
Date: 28 May 2026
Ownership: By VI E-Cell TropicalTelecom Ltd
Footnotes: F1

ATNI transaction

Common Stock

Sale

Transaction value: $356,737
Shares: -12,610
Change %: -9.9%
Price: $28.29
Shares after: 115,036
Date: 01 Jun 2026
Ownership: By VI E-Cell TropicalTelecom Ltd
Footnotes: F1, F8

ATNI transaction

Common Stock

Sale

Transaction value: $169,800
Shares: -6,000
Change %: -5.2%
Price: $28.30
Shares after: 109,036
Date: 02 Jun 2026
Ownership: By VI E-Cell TropicalTelecom Ltd
Footnotes: F1, F9

ATNI transaction

Common Stock

Gift

Transaction value
Shares: -10,000
Change %: -0.25%
Price: $0.000000^*
Shares after: 3,994,303
Date: 03 Jun 2026
Ownership: Direct
Footnotes: F1, F10

ATNI transaction

Common Stock

Sale

Transaction value: $54,600
Shares: -2,000
Change %: -1.8%
Price: $27.30
Shares after: 107,036
Date: 11 Jun 2026
Ownership: By VI E-Cell TropicalTelecom Ltd

ATNI transaction

Common Stock

Sale

Transaction value: $534,036
Shares: -19,100
Change %: -18%
Price: $27.96
Shares after: 87,936
Date: 12 Jun 2026
Ownership: By VI E-Cell TropicalTelecom Ltd
Footnotes: F11

ATNI holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 500
Date: 20 Apr 2026
Ownership: By Wife

ATNI holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 8,227
Date: 20 Apr 2026
Ownership: By Tropical Aircraft Co

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

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 11 footnotes

Footnote F1

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

Footnote F2

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.

Footnote F3

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.

Footnote F4

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.

Footnote F5

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.

Footnote F6

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.

Footnote F7

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

Footnote F8

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.

Footnote F9

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.

Footnote F10

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

Footnote F11

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.