ATN International holder plans 5,000-share sale

Rhea-AI Filing Summary

ATN International, Inc. (ATNI) received a Rule 144 notice that the Prior Family Foundation plans to sell up to 5,000 common shares of ATNI through UBS Financial Services, with a stated market value of $155,000, as of September 15, 2026, against 15,403,357 shares outstanding. The shares trace back to an initial equity investment gifted on November 30, 1986, and the foundation reports owning 363,424 shares. Over the prior three months, the Prior Family Foundation and VI E-Cell Tropical Telecom Ltd. disclosed multiple open-market sales of ATNI common shares. Cornelius B. Prior Jr. is described as an over 10% stakeholder and control person of ATN International, and a member of the Prior Family Foundation.

Key Figures

Shares to be sold under Rule 144: 5,000 shares Market value of shares to be sold: $155,000 ATNI shares outstanding: 15,403,357 shares +3 more

6 metrics

Shares to be sold under Rule 144 5,000 shares Planned sale by Prior Family Foundation through UBS Financial Services

Market value of shares to be sold $155,000 Stated value of 5,000 ATNI common shares as of September 15, 2026

ATNI shares outstanding 15,403,357 shares Common shares outstanding used as context in the notice

Shares owned by Prior Family Foundation 363,424 shares ATNI common shares from gift of initial equity investment dated November 30, 1986

Recent single trade example 10,000 shares for $318,692 Sale by VI E-Cell Tropical Telecom Ltd on August 19, 2026

Another recent trade example 7,000 shares for $227,838 Sale by VI E-Cell Tropical Telecom Ltd on August 10, 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

"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.

attorney-in-fact regulatory

"for UBS Financial Services Inc, as attorney-in-fact for Prior Family Foundation"

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

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

What does the Form 144 filing mean for ATNI shareholders?

It states that the Prior Family Foundation plans to sell up to 5,000 ATN International (ATNI) common shares under Rule 144 through UBS Financial Services, with a stated market value of $155,000. This is a notice of a potential secondary sale, not an issuance of new shares.

How many ATNI shares are covered by this Rule 144 notice?

The notice covers up to 5,000 ATN International (ATNI) common shares to be sold for the account of the Prior Family Foundation. The filing associates these shares with a market value of $155,000 as of September 15, 2026.

How many ATNI shares are outstanding according to this filing?

Shares outstanding are reported as 15,403,357 ATNI common shares as of the date referenced in the notice. This figure provides context and is separate from the 5,000 shares the Prior Family Foundation plans to sell.

Who is the selling holder in this ATNI Form 144 and what is their position?

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

What is the source and size of the ATNI position held by the Prior Family Foundation?

The filing describes the securities as originating from a gift of initial equity investment on November 30, 1986 from Cornelius B. Prior Jr. It reports that the Prior Family Foundation owns 363,424 ATNI common shares associated with this gift.

What recent ATNI share sales are disclosed for related accounts?

During the past three months, the filing lists several ATNI common share sales by the Prior Family Foundation and VI E-Cell Tropical Telecom Ltd., including trades such as 10,000 shares for $318,692 on August 19, 2026 and other smaller blocks on nearby dates.

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

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Available on EDGAR 09/15/2026 - 04:46 PM Accepted by SEC EDGAR 09/15/2026 - 04:45 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	9783174763
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	09/15/2026	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 P. O. Box 12030 St Thomas VI 00801-5030	common shares	06/25/2026	1500	40626
VI E-Cell Tropical Telecom Ltd P. O. Box 12030 St Thomas VI 00801-5030	common shares	06/29/2026	5000	138235
VI E-Cell Tropical Telecom Ltd P. O. Box 12030 St Thomas VI 00801-5030	common shares	08/06/2026	7000	208159
VI E-Cell Tropical Telecom Ltd P. O. Box 12030 St Thomas VI 00801-5030	common shares	08/07/2026	500	15585
VI E-Cell Tropical Telecom Ltd P. O. Box 12030 St Thomas VI 00801-5030	common shares	08/10/2026	7000	227838
VI E-Cell Tropical Telecom Ltd P. O. Box 12030 St Thomas VI 00801-5030	common shares	08/13/2026	2500	80125
Prior Family Foundation P. O. Box 12030 St Thomas VI 00801-5030	common shares	08/14/2026	5000	156500
VI E-Cell Tropical Telecom Ltd P. O. Box 12030 St Thomas VI 00801-5030	common shares	08/14/2026	26	834
Prior Family Foundation P. O. Box 12030 St Thomas VI 00801-5030	common shares	08/17/2026	5000	157070
VI E-Cell Tropical Telecom Ltd P. O. Box 12030 St Thomas VI 00801-5030	common shares	08/17/2026	5745	182651
VI E-Cell Tropical Telecom Ltd P. O. Box 12030 St Thomas VI 00801-5030	common shares	08/18/2026	1000	31750
VI E-Cell Tropical Telecom Ltd P. O. Box 12030 St Thomas VI 00801-5030	common shares	08/19/2026	10000	318692
Prior Family Foundation P. O. Box 12030 St Thomas VI 00801-5030	common shares	08/20/2026	5000	155471
VI E-Cell Tropical Telecom Ltd P. O. Box 12030 St Thomas VI 00801-5030	common shares	08/20/2026	500	15625
Prior Family Foundation P. O. Box 12030 St Thomas VI 00801-5030	common shares	08/24/2026	5000	155000
VI E-Cell Tropical Telecom Ltd P. O. Box 12030 St Thomas VI 00801-5030	common shares	08/24/2026	10000	313389
VI E-Cell Tropical Telecom Ltd P. O. Box 12030 St Thomas VI 00801-5030	common shares	09/02/2026	2582	80349
VI E-Cell Tropical Telecom Ltd P. O. Box 12030 St Thomas VI 00801-5030	common shares	09/04/2026	4542	140882

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	09/15/2026
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)