ATN International (ATNI) holder Cornelius Prior details 28.96% stake update

Rhea-AI Filing Summary

Cornelius B. Prior, Jr. filed an amended Schedule 13D updating his ownership in ATN International, Inc. common stock. He now reports beneficial ownership of 4,454,390 shares, representing 28.96% of the company’s outstanding common stock, based on 15,380,853 shares outstanding as of May 11, 2026.

The filing details a transfer of 200,000 shares from Mr. Prior to VI E-Cell Tropical Telecom Ltd., an entity 80% owned by him, and subsequent open market sales of 82,064 of those transferred shares between May 7 and June 12, 2026, at prices generally in the mid‑$20s per share. VI E-Cell also transferred 30,000 shares back to Mr. Prior.

Mr. Prior’s reported holdings include shares held directly, through Tropical Aircraft Co., his spouse, the Prior Family Foundation, and VI E-Cell. He disclaims beneficial ownership of VI E-Cell’s shares except to the extent of his pecuniary interest and states he has no current specific plans for corporate actions beyond those described.

Key Figures

Beneficial ownership: 4,454,390 shares Ownership percentage: 28.96% Shares outstanding: 15,380,853 shares +5 more

8 metrics

Beneficial ownership 4,454,390 shares ATN International common stock currently beneficially owned by Cornelius B. Prior, Jr.

Ownership percentage 28.96% Percent of ATN International common stock class represented by Prior’s holdings

Shares outstanding 15,380,853 shares ATN International common stock outstanding as of May 11, 2026

Sole voting power 4,002,530 shares Shares over which Prior has sole voting and dispositive power

Shared voting power 451,860 shares Shares over which Prior has shared voting and dispositive power

Transfer to VI E-Cell 200,000 shares Shares transferred by Prior to VI E-Cell on April 20, 2026

Shares sold by VI E-Cell 82,064 shares Aggregate of transferred shares sold between May 7 and June 12, 2026

Example sale price $25.54 per share Weighted average price for 3,500 shares sold on May 7, 2026

Key Terms

beneficial owner, sole voting power, shared dispositive power, open market sales, +2 more

6 terms

beneficial owner financial

"Mr. Prior is the beneficial owner of 4,454,390 shares of Common Stock"

A beneficial owner is the person who ultimately owns or controls a financial asset or property, even if their name isn't directly on official documents. Think of it like someone who secretly holds the keys to a safe deposit box—others may appear to have access, but the true owner is the one who benefits from what's inside. Identifying beneficial owners helps ensure transparency and prevent illegal activities like money laundering or fraud.

sole voting power financial

"Sole Voting Power 4,002,530.00"

Sole voting power is the exclusive right to cast votes attached to a shareholder’s stock without needing approval from anyone else. Like holding the only remote control for a TV, it lets that holder decide corporate matters such as board members, mergers, and policy changes, making it important to investors because it concentrates control and can strongly influence a company’s strategy and the value of its shares.

shared dispositive power financial

"Shared Dispositive Power 451,860.00"

open market sales financial

"sold 3,500 shares of Common Stock at a weighted average price of $25.54 per share in open market sales"

pecuniary interest financial

"Mr. Prior disclaims beneficial ownership of the shares of Common Stock held by VI E-Cell except to the extent of his pecuniary interest therein"

weighted average price financial

"at a weighted average price of $27.96 per share in open market sales"

Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 06/15/2026 - 09:56 PM Accepted by SEC EDGAR 06/15/2026 - 09:56 PM Learn about SEC filing dates

FAQ

How many ATN International (ATNI) shares does Cornelius Prior now beneficially own?

Cornelius B. Prior, Jr. reports beneficial ownership of 4,454,390 ATN International common shares, equal to 28.96% of the company’s outstanding stock, based on 15,380,853 shares outstanding as of May 11, 2026.

What change triggered Cornelius Prior’s amended Schedule 13D for ATNI?

The amendment reflects Prior’s transfer of 200,000 ATN International shares to VI E-Cell Tropical Telecom Ltd., subsequent open market sales of 82,064 of those shares by VI E-Cell, and a 30,000‑share transfer back to Prior.

How is Cornelius Prior’s 28.96% ATN International stake structured?

His 4,454,390 beneficially owned shares include 3,994,303 held directly, 8,227 via Tropical Aircraft Co., 500 by his wife, 363,424 by the Prior Family Foundation, and 87,936 by VI E-Cell Tropical Telecom Ltd.

What trading activity did VI E-Cell report in ATN International stock?

VI E-Cell sold 82,064 transferred shares in multiple open market sales between May 7 and June 12, 2026, at weighted average and specific prices generally between about $25.00 and $28.40 per share.

Does Cornelius Prior have sole or shared voting power over his ATNI shares?

He reports sole voting and dispositive power over 4,002,530 ATN International shares and shared voting and dispositive power over 451,860 shares, reflecting holdings through family and related entities.

Did Cornelius Prior donate any ATN International shares recently?

Yes. He transferred 1,700 ATN International shares on April 17, 2026, and 10,000 shares on June 3, 2026, to non‑profit entities for no consideration, as disclosed in the amended Schedule 13D.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13D

Under the Securities Exchange Act of 1934

(Amendment No. 1)

ATN International, Inc.

(Name of Issuer)

Common Stock, par value $.01 per share

(Title of Class of Securities)

00215F107

(CUSIP Number)

Cornelius B. Prior, Jr.
5521 Curacao Gade,
St. Thomas, D8, 00802
978-619-1300

(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)

04/20/2026

(Date of Event Which Requires Filing of This Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§ 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box.

The information required on the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

schemaVersion:

SCHEDULE 13D

CUSIP Number(s): 00215F107

1

Name of reporting person

PRIOR CORNELIUS B JR

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

PF

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 4,002,530.00
8	Shared Voting Power 451,860.00
9	Sole Dispositive Power 4,002,530.00
10	Shared Dispositive Power 451,860.00

11

Aggregate amount beneficially owned by each reporting person

4,454,390.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

28.96 %

14

Type of Reporting Person (See Instructions)

IN

SCHEDULE 13D

Item 1.	Security and Issuer
(a)	Title of Class of Securities: Common Stock, par value $.01 per share
(b)	Name of Issuer: ATN International, Inc.
(c)	Address of Issuer's Principal Executive Offices: 500 Cummings Center, Beverly, MASSACHUSETTS , 01915.
Item 1 Comment: Cornelius B. Prior, Jr. transferred 200,000 shares (the "Transferred Shares") of Common Stock, $0.01 par value ("Common Stock"), of the ATN International, Inc. (the "Company" or the "Issuer") to VI E-Cell Tropical Telecom Ltd. ("VI E-Cell"), a U.S. Virgin Islands limited company that is 80% owned by Mr. Prior and of which Mr. Prior serves as the chairman. VI E-Cell subsequently sold an aggregate of 82,064 of the Transferred Shares between May 7, 2026 and June 12, 2026 and transferred 30,000 of the Transferred Shares back to Mr. Prior on May 27, 2026. This Amendment No. 1 to Schedule 13D ("Amendment No. 1") is being filed to reflect the aforementioned transfers and sales and amends and supplements the initial statement on Schedule 13D filed by Mr. Prior with the Securities and Exchange Commission on May 7, 2024 (the "Original Schedule 13D"). Except as set forth below, all items of the Original Schedule 13D remain unchanged.
Item 3.	Source and Amount of Funds or Other Consideration
	Item 3 of the Schedule 13D is hereby amended and restated as follows: Except as otherwise set forth herein, all of the shares of Common Stock beneficially owned by Mr. Prior ("Directly Owned Shares") were acquired (i) in connection with the founding of the Company, (ii) in connection with investing additional capital in the Company prior to its initial public offering, or (iii) open market purchases. The source of the funds for the Directly Owned Shares was from personal funds. No part of the purchase price was borrowed for the purpose of acquiring such securities. All of the shares of Common Stock held by Tropical Aircraft Co., VI E-Cell Tropical Telecom Ltd., and the Prior Family Foundation were acquired as a result of a gift or contribution from Mr. Prior. All of the shares of Common Stock held by Mrs. Prior were acquired through open market purchases. The information in Item 5(c) is incorporated herein by reference.
Item 4.	Purpose of Transaction
	Except as described in this Amendment No. 1 to Schedule 13D, Mr. Prior does not have any present plans or proposals that relate to or would result in any of the actions described in Item 4 of this Schedule 13D, although, Mr. Prior, at any time and from time to time, may review, reconsider and change his position and/or change his purpose and/or develop such plans and may seek to influence management of the Issuer or the board of directors of the Issuer with respect to the business and affairs of the Issuer and may from time to time consider pursuing or proposing such matters with advisors, the Issuer or other persons. Any such action may be made by Mr. Prior alone or in conjunction with other stockholders, potential acquirers, financing sources and/or other third parties and could include one or more purposes, plans or proposals that relate to or would result in actions required to be reported herein in accordance with Item 4 of Schedule 13D.
Item 5.	Interest in Securities of the Issuer
(a)	Mr. Prior is the beneficial owner of 4,454,390 shares of Common Stock, consisting of: (i) 3,994,303 shares of Common Stock held directly by Mr. Prior; (ii) 8,227 shares of Common Stock held by Tropical Aircraft Co., of which Mr. Prior is the sole shareholder and President; (iii) 500 shares of Common Stock held by Gertrude J. Prior, Mr. Prior's wife; (iv) 363,424 shares of Common Stock held by the Prior Family Foundation, a charitable trust for which Mr. Prior serves as co-trustee; and (v) 87,936 shares of Common Stock held by VI E-Cell Tropical Telecom Ltd., a U.S. Virgin Islands limited company that is 80% owned by Mr. Prior and of which Mr. Prior serves as chairman. Mr. Prior disclaims beneficial ownership of the shares of Common Stock held by VI E-Cell except to the extent of his pecuniary interest therein. The percentage calculation herein is based upon the statement in the Issuer's Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on May 11, 2026, that there were 15,380,853 shares of Common Stock of the Issuer outstanding as of May 11, 2026.
(b)	Mr. Prior has sole power to vote or to direct the vote and to dispose or to direct the disposition with respect to 4,002,530 shares of Common Stock. Mr. Prior has shared power to vote or to direct the vote and to dispose or to direct the disposition with respect to 451,860 shares of Common Stock.
(c)	Except as otherwise set forth herein, there have been no transactions in securities of the Issuer by Mr. Prior during the past 60 days. On April 17, 2026, Mr. Prior transferred 1,700 shares of Common Stock to a non-profit entity for no consideration. On April 20, 2026, Mr. Prior transferred 200,000 shares of Common Stock to VI E-Cell for no consideration. On May 7, 2026, VI E-Cell sold 3,500 shares of Common Stock at a weighted average price of $25.54 per share in open market sales. The shares of Common Stock were sold at prices ranging from $25.00 to $25.75, inclusive. On May 7, 2026, VI E-Cell sold 2,500 shares of Common Stock at a price of $26.00 per share in open market sales. On May 8, 2026, VI E-Cell sold 1,000 shares of Common Stock at a price of $26.25 per share in open market sales. On May 11, 2026, VI E-Cell sold 5,000 shares of Common Stock at a price of $27.25 per share in open market sales. On May 14, 2026, VI E-Cell sold 2,000 shares of Common Stock at a price of $27.25 per share in open market sales. On May 20, 2026, VI E-Cell sold 3,500 shares of Common Stock at a price of $27.02 per share in open market sales. On May 21, 2026, VI E-Cell sold 2,000 shares of Common Stock at a price of $27.25 per share in open market sales. On May 26, 2026, VI E-Cell sold 2,854 shares of Common Stock at a weighted average price of $27.96 per share in open market sales. The shares of Common Stock were sold at prices ranging from $27.87 to $28.00, inclusive. On May 27, 2026, VI E-Cell sold 17,500 shares of Common Stock at a weighted average price of $28.17 per share in open market sales. The shares of Common Stock were sold at prices ranging from $28.00 to $28.65, inclusive. On May 27, 2026, VI E-Cell transferred 30,000 shares of Common Stock to Mr. Prior for no consideration. On May 28, 2026, VI E-Cell sold 2,500 shares of Common Stock at a price of $28.25 per share in open market sales. On June 1, 2026, VI E-Cell sold 12,610 shares of Common Stock at a weighted average price of $28.29 per share in open market sales. The shares of Common Stock were sold at prices ranging from $28.25 to $28.35, inclusive. On June 2, 2026, VI E-Cell sold 6,000 shares of Common Stock at a weighted average price of $28.30 per share in open market sales. The shares of Common Stock were sold at prices ranging from $28.30 to $28.31, inclusive. Mr. Prior undertake to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares of Common Stock sold at each separate price within the ranges set forth above in this Item 5(c). On June 3, 2026, Mr. Prior transferred 10,000 shares of Common Stock to a non-profit entity for no consideration. On June 11, 2026, VI E-Cell sold 2,000 shares of Common Stock at a price of $27.30 per share in open market sales. On June 12, 2026, VI E-Cell sold 19,100 shares of Common Stock at a weighted average price of $27.96 per share in open market sales. The shares of Common Stock were sold at prices ranging from $27.56 to $28.40, inclusive.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

PRIOR CORNELIUS B JR

Signature:	/s/ Cornelius B. Prior, Jr
Name/Title:	PRIOR CORNELIUS B JR
Date:	06/15/2026