ATN International (ATNI) chair has 2,378 shares withheld for RSU taxes

Rhea-AI Filing Summary

ATN International executive chairman Michael T. Prior reported a routine tax-related share disposition. On this Form 4, 2,378 shares of ATN International common stock were withheld by the company at a price of $27.92 per share to cover his tax obligation from the vesting of previously granted restricted stock units.

After this withholding, Prior directly holds 587,673 common shares. The filing also shows additional indirect holdings through several family trusts, where he is listed as trustee, indicating a substantial ongoing ownership position despite the tax-withholding transaction.

Insider Trade Summary

6 transactions reported

Mixed 6 txns

Insider PRIOR MICHAEL T

Role Director

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock	2,378	$27.92	$66K
holding	Common Stock	--	--	--
holding	Common Stock	--	--	--
holding	Common Stock	--	--	--
holding	Common Stock	--	--	--
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 587,673 shares (Direct); Common Stock — 128,847 shares (Indirect, Trustee of Lauren S. Prior 2013 Trust)

Footnotes (1)

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Form 4 Insider Transactions: What Each Field Means →

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

PRIOR MICHAEL T

(Last) (First) (Middle)

C/O ATN INTERNATIONAL, INC.

500 CUMMINGS CENTER

(Street)

BEVERLY MASSACHUSETTS 01915

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
ATN International, Inc. [ ATNI ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)	X	Other (specify below)
			EXECUTIVE CHAIRMAN

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
03/25/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	03/25/2026		F(1)		2,378	D	$27.92	587,673	D
Common Stock								128,847	I	Trustee of Lauren S. Prior 2013 Trust
Common Stock								8,141	I	Trustee of JP 2018 Trust
Common Stock								7,741	I	Trustee of WP 2015 Trust
Common Stock								8,041	I	Trustee of RP 2014 Trust
Common Stock								7,982	I	Trustee of Prior Family Trust 2019

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Represents shares withheld by the Company for payment of Mr. Prior's tax obligation arising from the vesting of previously granted Restricted Stock Units.

	/s/ Michael T. Prior	03/27/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

FAQ

What did ATN International (ATNI) executive chairman Michael Prior report in this Form 4?

Michael T. Prior reported that 2,378 ATN International shares were withheld by the company to satisfy his tax obligations from vesting restricted stock units, rather than sold on the open market. This is a routine compensation-related event, not a discretionary share sale.

How many ATN International (ATNI) shares were withheld for Michael Prior’s taxes?

The filing shows 2,378 ATN International common shares were withheld at $27.92 per share. These shares covered Michael Prior’s tax liability arising from the vesting of previously granted restricted stock units, according to the accompanying explanatory footnote.

How many ATN International (ATNI) shares does Michael Prior hold after this tax withholding?

Following the tax withholding, Michael Prior directly holds 587,673 ATN International common shares. The Form 4 also lists additional indirect holdings through several family trusts where he is trustee, indicating further exposure to ATN’s stock beyond his direct position.

Was this ATN International (ATNI) Form 4 a market sale by Michael Prior?

No. The Form 4 describes a tax-withholding disposition, not an open-market sale. Shares were retained by ATN International to cover Michael Prior’s tax obligation from vesting restricted stock units, as explicitly stated in the footnote, making this a standard compensation-related transaction.

What role does Michael Prior hold at ATN International (ATNI) in this Form 4?

Michael T. Prior is identified as a director and executive chairman of ATN International. The Form 4 reflects his equity compensation activity and resulting holdings, including both his direct share position and indirect positions as trustee of several family trusts.