ATN International holder to sell $155K in shares

ATN International, Inc. (ATNI) is the issuer in a Rule 144 notice filed for planned sales of its common shares by the Prior Family Foundation.

Rhea-AI Filing Summary

ATN International, Inc. (ATNI) is the issuer in a Rule 144 notice filed for planned sales of its common shares by the Prior Family Foundation. The filing lists 5,000 common shares proposed to be sold through UBS Financial Services Inc., with an aggregate market value of $155,000, against 15,403,357 common shares outstanding as of the notice. The shares trace back to an initial equity investment received by the Foundation as a gift from Cornelius B. Prior Jr., who is described as an over 10% stakeholder and control person of ATN International and a member of the Prior Family Foundation. The filing also details multiple open-market sales of ATN common shares by affiliated entities over the prior three months.

Key Figures

Number of shares to be sold: 5,000 common shares Aggregate market value of shares to be sold: $155,000 Shares outstanding: 15,403,357 common shares +4 more

7 metrics

Number of shares to be sold 5,000 common shares Planned Rule 144 sale by Prior Family Foundation

Aggregate market value of shares to be sold $155,000 Planned sale of 5,000 common shares through UBS Financial Services Inc.

Shares outstanding 15,403,357 common shares ATN International common shares outstanding as referenced in the notice

Shares acquired by gift 363,424 common shares Gift of initial equity investment to Prior Family Foundation on 11/30/1986

Sale on 06/12/2026 19,100 common shares for $534,036 Past three months’ sales by VI E-Cell Tropical Telecom Ltd

Sale on 08/19/2026 10,000 common shares for $318,692 Past three months’ sales by VI E-Cell Tropical Telecom Ltd

Date of notice 08/24/2026 Filing date of the Form 144 notice

Key Terms

Rule 144, control person, aggregate market value, common shares

4 terms

Rule 144 regulatory

"See the definition of "person" in paragraph (a) of Rule 144."

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

control person regulatory

"Cornelius B Prior Jr is an over 10% stakeholder and control person of ATN International Inc."

A control person is an individual or entity that can significantly influence a company’s decisions and direction through ownership, voting power, or contractual rights—think of them as the captain who can steer the ship. Investors care because a control person’s choices affect corporate strategy, board appointments, and transactions that can raise or lower a stock’s value, and they often carry additional legal responsibilities and disclosure requirements to protect other shareholders.

aggregate market value financial

"5000 | 155000 | 15403357 | 08/24/2026 | NASDAQ"

Aggregate market value is the combined price you would pay to buy all outstanding shares of a company or all companies in a group at current market prices — essentially the sum of each stock’s market capitalization. It matters to investors because it shows the overall size and weight of an investment or sector (like the total cost to buy every piece of a puzzle), helps compare scale across companies or markets, and influences index composition and risk exposure.

common shares financial

"common shares | UBS Financial Services Inc 1000 Harbor Blvd"

Common shares are the basic units of ownership in a company that give holders a claim on profits and a right to vote on key matters, like electing the board. Think of them as membership cards in a club: they let you share in successes and losses, but in a bankruptcy or liquidation they are paid after creditors and preferred shareholders, so their value can swing more and matters for assessing risk and potential return.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What does the Form 144 filing for ATNI disclose about planned share sales?

The Form 144 discloses that the Prior Family Foundation plans to sell 5,000 ATN International (ATNI) common shares through UBS Financial Services Inc., with an aggregate market value of $155,000, under Rule 144 on or after the date specified in the notice.

How many ATN International (ATNI) shares are outstanding according to this notice?

The notice states that there are 15,403,357 ATN International common shares outstanding as of the filing reference, providing a baseline figure for comparing the 5,000 shares proposed to be sold under this Form 144.

Who is selling ATNI shares under this Form 144 and what is their relationship to the company?

The selling security holder is the Prior Family Foundation. The filing explains that Cornelius B. Prior Jr. is an over 10% stakeholder and control person of ATN International and a member of the Foundation, which is selling the shares.

How were the ATNI shares to be sold originally acquired by the Prior Family Foundation?

The Form 144 states that the shares were acquired on 11/30/1986 by the Prior Family Foundation as a “Gift of initial equity investment” from Cornelius B. Prior Jr., with 363,424 shares shown in the acquisition information section.

What recent ATNI share sales are reported for the Prior Family Foundation and affiliates?

The filing lists several sales of ATN International common shares in the past three months, including 19,100 shares on 06/12/2026 for $534,036 and 10,000 shares on 08/19/2026 for $318,692, by VI E-Cell Tropical Telecom Ltd and the Prior Family Foundation.

Which broker is handling the planned ATNI share sale under this Form 144?

The planned sale of 5,000 ATN International (ATNI) common shares is to be executed through UBS Financial Services Inc., identified in the filing as the broker handling the transaction.

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

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Available on EDGAR 08/24/2026 - 01:11 PM EDT Accepted by SEC EDGAR 08/24/2026 - 01:10 PM EDT Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001366518
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	ATN International, Inc.
SEC File Number	001-12593
Address of Issuer	500 Cummings Center, Suite 2450 Beverly MASSACHUSETTS 01915
Phone	9786191300
Name of Person for Whose Account the Securities are To Be Sold	Prior Family Foundation DTD 6/9/06
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Stakeholder

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
common shares	UBS Financial Services Inc 1000 Harbor Blvd 3rd Floor Weehawken NJ 07086	5000	155000	15403357	08/24/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
common shares	11/30/1986	Gift of initial equity investment	Cornelius B Prior Jr			363424	11/30/1986	Gift of initial equity investment

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
VI E-Cell Tropical Telecom Ltd PO Box 12030 St Thomas VI 00801-5030	common shares	05/26/2026	2854	79798
VI E-Cell Tropical Telecom Ltd PO Box 12030 St Thomas VI 00801-5030	common shares	05/27/2026	17500	492975
VI E-Cell Tropical Telecom Ltd PO Box 12030 St Thomas VI 00801-5030	common shares	05/28/2026	2500	70625
VI E-Cell Tropical Telecom Ltd PO Box 12030 St Thomas VI 00801-5030	common shares	06/01/2026	12610	356737
VI E-Cell Tropical Telecom Ltd PO Box 12030 St Thomas VI 00801-5030	common shares	06/02/2026	6000	169800
VI E-Cell Tropical Telecom Ltd PO Box 12030 St Thomas VI 00801-5030	common shares	06/11/2026	2000	54600
VI E-Cell Tropical Telecom Ltd PO Box 12030 St Thomas VI 00801-5030	common shares	06/12/2026	19100	534036
VI E-Cell Tropical Telecom Ltd PO Box 12030 St Thomas VI 00801-5030	common shares	06/25/2026	1500	40626
VI E-Cell Tropical Telecom Ltd PO Box 12030 St Thomas VI 00801-5030	common shares	06/29/2026	5000	138235
VI E-Cell Tropical Telecom Ltd PO Box 12030 St Thomas VI 00801-5030	common shares	08/06/2026	7000	208159
VI E-Cell Tropical Telecom Ltd PO Box 12030 St Thomas VI 00801-5030	common shares	08/07/2026	500	15585
VI E-Cell Tropical Telecom Ltd PO Box 12030 St Thomas VI 00801-5030	common shares	08/13/2026	2500	80125
VI E-Cell Tropical Telecom Ltd PO Box 12030 St Thomas VI 00801-5030	common shares	08/14/2026	26	834
Prior Family Foundation PO Box 12030 St Thomas VI 00801-5030	common shares	08/14/2026	5000	156508
Prior Family Foundation PO Box 12030 St Thomas VI 00801-5030	common shares	08/17/2026	5000	157200
VI E-Cell Tropical Telecom Ltd PO Box 12030 St Thomas VI 00801-5030	common shares	08/17/2026	5745	182651
VI E-Cell Tropical Telecom Ltd PO Box 12030 St Thomas VI 00801-5030	common shares	08/18/2026	1000	31750
VI E-Cell Tropical Telecom Ltd PO Box 12030 St Thomas VI 00801-5030	common shares	08/19/2026	10000	318692
Prior Family Foundation PO Box 12030 St Thomas VI 00801-5030	common shares	08/20/2026	5000	155471
VI E-Cell Tropical Telecom Ltd PO Box 12030 St Thomas VI 00801-5030	common shares	08/20/2026	500	15625

144: Remarks and Signature

Remarks	Cornelius B Prior Jr is an over 10% stakeholder and control person of ATN International Inc. Cornelius B Prior Jr is also a member of the Prior Family Foundation, who is selling the shares.
Date of Notice	08/24/2026
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/Mijo Suric, for UBS Financial Services Inc, as attorney-in-fact for Prior Family Foundation DTD 6/9/06
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)