ATN International (NASDAQ: ATNI) foundation plans 5,000-share sale

Rhea-AI Filing Summary

ATN International, Inc. (ATNI) received a Rule 144 notice relating to a proposed sale of its common shares. The Prior Family Foundation DTD 6/9/06, for whose account the securities are to be sold, plans to sell 5,000 common shares of ATN International through UBS Financial Services Inc. on NASDAQ.

The notice states that Cornelius B. Prior Jr. is an over 10% stakeholder and control person of ATN International, Inc. and is also a member of the Prior Family Foundation. The filing also lists multiple prior open-market sales of ATN International common shares over the past three months by VI E-Cell Tropical Telecom Ltd and the Prior Family Foundation.

Key Figures

Shares to be sold: 5,000 shares Approximate market value of shares to be sold: $155,000 Shares outstanding (context): 15,400,000 shares +3 more

6 metrics

Shares to be sold 5,000 shares Common shares of ATN International, Inc. proposed for sale under Rule 144

Approximate market value of shares to be sold $155,000 Aggregate market value of the 5,000 common shares covered by the notice

Shares outstanding (context) 15,400,000 shares Number of ATN International common shares outstanding reported in the securities information section

Past sale on 06/12/2026 19,100 shares for $534,036 Common share sale by VI E-Cell Tropical Telecom Ltd on 06/12/2026

Past sale on 08/19/2026 10,000 shares for $318,692 Common share sale by VI E-Cell Tropical Telecom Ltd on 08/19/2026

Foundation sale on 08/17/2026 5,000 shares for $157,070 Common share sale by Prior Family Foundation on 08/17/2026

Key Terms

Rule 144, control person, attorney-in-fact

3 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

"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.

attorney-in-fact regulatory

"as attorney-in-fact for Prior Family Foundation DTD 6/9/06"

An attorney-in-fact is the person or entity given legal authority through a power of attorney to act on behalf of another for specific tasks, such as signing documents, voting shares, or handling transactions. For investors, this matters because it lets a trusted representative make timely decisions or complete paperwork when the owner cannot, much like handing keys to someone to run errands on your behalf—so checks on scope and limits of that authority are important.

FAQ

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

The filing discloses that the Prior Family Foundation plans to sell 5,000 common shares of ATN International, Inc. through UBS Financial Services Inc. on NASDAQ under Rule 144, which governs resales of restricted and control securities.

Who is the selling security holder in ATNI’s Form 144 filing?

The selling security holder is the Prior Family Foundation DTD 6/9/06. The filing notes that Cornelius B. Prior Jr., an over 10% stakeholder and control person of ATN International, is a member of the Prior Family Foundation, which is selling the shares.

How many ATNI shares are proposed to be sold and what is their approximate market value?

The notice covers a proposed sale of 5,000 ATN International common shares with an approximate aggregate market value of $155,000. It also reports 15,400,000 common shares outstanding for context, which is a baseline figure, not the amount being sold.

What ATNI share sales occurred in the past three months according to the Form 144?

The filing lists multiple sales of ATN International common shares between May and August 2026 by VI E-Cell Tropical Telecom Ltd and by the Prior Family Foundation, including transactions such as 19,100 shares for $534,036 on June 12, 2026.

What is Cornelius B. Prior Jr.’s relationship to ATN International (ATNI) in this filing?

The filing states that Cornelius B. Prior Jr. is an over 10% stakeholder and a control person of ATN International, Inc. It also notes that he is a member of the Prior Family Foundation, for whose account the ATNI shares are being sold.

When was the Form 144 notice for ATNI dated and which broker is named?

The date of the Rule 144 notice is 08/20/2026. The named broker handling the proposed sale is UBS Financial Services Inc., listed in the section describing the common shares to be sold on NASDAQ.

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

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Available on EDGAR 08/20/2026 - 03:54 PM Accepted by SEC EDGAR 08/20/2026 - 03:53 PM 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	15400000	08/20/2026	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	common shares	05/20/2026	3500	94570
VI E-Cell Tropical Telecom Ltd PO Box 12030 St Thomas VI 00801	common shares	05/21/2026	2000	54500
VI E-Cell Tropical Telecom Ltd PO Box 12030 St Thomas VI 00801	common shares	05/26/2026	2854	79798
VI E-Cell Tropical Telecom Ltd PO Box 12030 St Thomas VI 00801	common shares	05/27/2026	17500	492975
VI E-Cell Tropical Telecom Ltd PO Box 12030 St Thomas VI 00801	common shares	05/28/2026	2500	70625
VI E-Cell Tropical Telecom Ltd PO Box 12030 St Thomas VI 00801	common shares	06/01/2026	12610	356737
VI E-Cell Tropical Telecom Ltd PO Box 12030 St Thomas VI 00801	common shares	06/02/2026	6000	169800
VI E-Cell Tropical Telecom Ltd PO Box 12030 St Thomas VI 00801	common shares	06/11/2026	2000	54600
VI E-Cell Tropical Telecom Ltd PO Box 12030 St Thomas VI 00801	common shares	06/12/2026	19100	534036
VI E-Cell Tropical Telecom Ltd PO Box 12030 St Thomas VI 00801	common shares	06/25/2026	1500	40626
VI E-Cell Tropical Telecom Ltd PO Box 12030 St Thomas VI 00801	common shares	06/29/2026	5000	138235
VI E-Cell Tropical Telecom Ltd PO Box 12030 St Thomas VI 00801	common shares	08/06/2026	7000	208159
VI E-Cell Tropical Telecom Ltd PO Box 12030 St Thomas VI 00801	common shares	08/07/2026	500	15585
VI E-Cell Tropical Telecom Ltd PO Box 12030 St Thomas VI 00801	common shares	08/13/2026	2500	80125
VI E-Cell Tropical Telecom Ltd PO Box 12030 St Thomas VI 00801	common shares	08/14/2026	26	834
Prior Family Foundation PO Box 12030 St Thomas VI 00801	common shares	08/14/2026	5000	156508
Prior Family Foundation PO Box 12030 St Thomas VI 00801	common shares	08/17/2026	5000	157070
VI E-Cell Tropical Telecom Ltd PO Box 12030 St Thomas VI 00801	common shares	08/17/2026	5745	182651
VI E-Cell Tropical Telecom Ltd PO Box 12030 St Thomas VI 00801	common shares	08/18/2026	1000	31750
VI E-Cell Tropical Telecom Ltd PO Box 12030 St Thomas VI 00801	common shares	08/19/2026	10000	318692

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	08/20/2026
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)