ATN International chair shares withheld for taxes

ATN International executive chairman Michael T. Prior had 6,877 common shares withheld to cover tax obligations from restricted stock unit vesting.

Rhea-AI Filing Summary

ATN International executive chairman Michael T. Prior had 6,877 common shares withheld to cover tax obligations from restricted stock unit vesting. The shares were withheld on March 12 and March 13 at prices of $24.65 and $24.49 per share. After these tax-withholding dispositions, he directly holds 576,527 common shares and also reports additional indirect holdings through several family trusts.

Insider Trade Summary

Exercise Price or Tax Liability: 6,877 shares

Exercise Price or Tax Liability 7 txns

Insider PRIOR MICHAEL T

Role Director

Type	Security	Shares	Price	Value
Exercise Price or Tax Liability	Common Stock	4,686	$24.49	$115K
Exercise Price or Tax Liability	Common Stock	2,191	$24.65	$54K
holding	Common Stock	--	--	--
holding	Common Stock	--	--	--
holding	Common Stock	--	--	--
holding	Common Stock	--	--	--
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 576,527 shares (Direct); Common Stock — 128,847 shares (Indirect, Trustee of Lauren S. Prior 2013 Trust); Common Stock — 8,141 shares (Indirect, Trustee of JP 2018 Trust); Common Stock — 7,741 shares (Indirect, Trustee of WP 2015 Trust); Common Stock — 8,041 shares (Indirect, Trustee of RP 2014 Trust); Common Stock — 7,982 shares (Indirect, Trustee of Prior Family Trust 2019)

Footnotes (2)

1. F1. Represents shares withheld by the Company for payment of Mr. Prior's tax obligation arising from the vesting of previously granted Restricted Stock Units.
2. F2. Refer to existing footnote (1)

FAQ

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What insider transaction did ATNI director Michael T. Prior report on this Form 4?

Michael T. Prior reported company share withholdings to pay taxes on vested restricted stock units. These were coded as F transactions, reflecting tax-withholding dispositions rather than open-market sales, and relate to previously granted equity awards.

How many ATNI shares were withheld for Michael T. Prior’s tax obligations?

A total of 6,877 ATN International common shares were withheld to satisfy Michael T. Prior’s tax obligations. The withholdings occurred in two entries of 4,686 shares and 2,191 shares tied to vesting of restricted stock units.

At what prices were ATNI shares withheld for Michael T. Prior’s taxes?

The company withheld shares at prices of $24.49 and $24.65 per share. These amounts represent the fair market value used to determine how many shares were needed to cover the tax liabilities from the restricted stock unit vesting.

How many ATNI shares does Michael T. Prior hold directly after these transactions?

After the tax-withholding dispositions, Michael T. Prior directly holds 576,527 ATN International common shares. This direct ownership figure reflects his remaining position following the 6,877 shares withheld for tax obligations tied to restricted stock unit vesting.

What indirect ATNI holdings does Michael T. Prior report through trusts?

Michael T. Prior reports indirect ATN International holdings as trustee for several trusts, including 128,847 shares for the Lauren S. Prior 2013 Trust and smaller positions for JP 2018, WP 2015, RP 2014, and Prior Family Trust 2019, as holding entries without new transactions.

Do these ATNI Form 4 entries represent open-market sales by Michael T. Prior?

These entries do not represent open-market sales. They are Form 4 code F tax-withholding dispositions, where ATN International withheld shares to pay Michael T. Prior’s tax obligations arising from the vesting of restricted stock units previously granted.

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Accepted by SEC EDGAR 03/27/2026 - 05:34 PM EDT Learn about SEC filing dates

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)
03/12/2026

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	03/12/2026		F(1)		2,191	D	$24.65	581,213	D
Common Stock	03/13/2026		F(2)		4,686	D	$24.49	576,527	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.

2. Refer to existing footnote (1)

	/s/ Andy Fienberg , Attorney-in-Fact	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)