SECURITIES AND EXCHANGE COMMISSIONSEC FORM 17-C

CURRENT REPORT UNDER SECTION 17
OF THE SECURITIES REGULATION CODE
AND SRC RULE 17.2(c) THEREUNDER

1. Date of Report (Date of earliest event reported)

Sep 23, 2026

2. SEC Identification Number

37535

3. BIR Tax Identification No.

005-056-869_

4. Exact name of issuer as specified in its charter

ATN Holdings Inc

5. Province, country or other jurisdiction of incorporation

Philippines

6. Industry Classification Code(SEC Use Only)

7. Address of principal office

Unit 904 Postal Code Summ

8. Issuer's telephone number, including area code

(632) - 7717-0523

9. Former name or former address, if changed since last report

CITY OF MANDALUYONG

10. Securities registered pursuant to Sections 8 and 12 of the SRC or Sections 4 and 8 of the RSA

Title of Each Class	Number of Shares of Common Stock Outstanding and Amount of Debt Outstanding
Common A	402,505,542
Common B	280,000,000

11. Indicate the item numbers reported herein

1

The Exchange does not warrant and holds no responsibility for the veracity of the facts and representations contained in all corporate disclosures, including financial reports. All data contained herein are prepared and submitted by the disclosing party to the Exchange, and are disseminated solely for purposes of information. Any questions on the data contained herein should be addressed directly to the Corporate Information Officer of the disclosing party.

ATN Holdings, Inc.ATN

PSE Disclosure Form 7-1 - Notice of Annual or Special Stockholders' Meeting References: SRC Rule 17 (SEC Form 17-C) and
Sections 7 and 4.4 of the Revised Disclosure Rules

Subject of the Disclosure
NOTICE OF ANNUAL STOCKHOLDERS’ MEETING
Background/Description of the Disclosure
TO ALL STOCKHOLDERS ATN HOLDINGS, INC. NOTICE IS HEREBY GIVEN that the Annual Meeting of Stockholders of ATN HOLDINGS, INC. will be held via remote communication / ZOOM, on Thursday, November 12, 2026 at 1:30 P.M. at the 8th Floor, Summit One Tower Parking Building, 530 Shaw Boulevard, Mandaluyong City. Online access credentials as follows: https://us05web.zoom.us/launch/jc/83604382298

Type of Meeting

• Annual
• Special

Date of Approval by Board of Directors	Sep 23, 2026
Date of Stockholders' Meeting	Nov 12, 2026
Time	1:30pm
Venue	Teleconferencing via Zoom Meeting: https://us05web.zoom.us/launch/jc/83604382298
Record Date	Oct 14, 2026
Agenda	The following matters will be taken up during the meeting: 1. Proof of Notice of the Meeting. 2. Proof of Presence of a quorum. 3. Approval of the Minutes of the previous Annual Stockholders’ Meeting held on November 13, 2025. 4. Report of the President and Approval of the FY March 31, 2026 Audited Financial Statements. 5. General ratification of the acts of the Board of Directors, Board Committees, and the Management from the date of the last annual stockholders’ meeting up to the date of this meeting. 6. Updates on the Declassification of Class “A” and Class “B” Common Shares into a Single Class of Common Shares. 7. Election of Directors. 8. Appointment of External Auditor. 9. Adjournment.

Inclusive Dates of Closing of Stock Transfer Books

Start Date	Oct 14, 2026
End Date	Oct 14, 2026

Other Relevant Information

Shareholders of the Corporation may only participate via remote communication. To register, please download the registration and proxy form at http://www.atnholdings.com/notice%20of%20annual/uploads/index3.php and email the completed form and supporting documents to [email protected]. Deadline for registration and submission of requirements is on November 5, 2026 at 12:00 Noon, The Company is not soliciting proxies. Should you be unable to attend the meeting, you may nevertheless be represented and vote at the ASM by submitting a duly accomplished proxy by email to [email protected], or by sending a physical copy to the Office of the Corporate Secretary at Unit 904 Summit One Tower, 530 Shaw Boulevard, Mandaluyong City. The deadline for submission of proxies is on November 5, 2026 at 12:00 Noon. Validation of proxies will be held on November 5, 2026 at 2:00 P.M. at the Office of the Corporate Secretary, Unit 904 Summit One Tower, 530 Shaw Boulevard, Mandaluyong City. Any stockholder may be present in person or through counsel during the validation.