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)

Oct 7, 2026

2. SEC Identification Number

37535

3. BIR Tax Identification No.

37535

4. Exact name of issuer as specified in its charter

ATN HOLDINGS, INC.

5. Province, country or other jurisdiction of incorporation

Mandaluyong, Philippines

6. Industry Classification Code(SEC Use Only)

7. Address of principal office

9th Floor Summit One Tower 530 Shaw Boulevard, Mandaluyong City Postal Code 1550

8. Issuer's telephone number, including area code

(632) - 7717-0523

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

n/a

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	6,825,055,429

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 4-30 - Material Information/Transactions References: SRC Rule 17 (SEC Form 17-C) and
Sections 4.1 and 4.4 of the Revised Disclosure Rules

Subject of the Disclosure
SEC Approval - Declassification of Class “A” and Class “B” Common Shares
Background/Description of the Disclosure
SEC APPROVAL OF DECLASSIFICATION OF CLASS “A” AND CLASS “B” COMMON SHARES On 07 October 2026, the Corporation received from the Securities and Exchange Commission (“SEC”) the approval of the amendment of Article Seventh of the Articles of Incorporation of ATN Holdings, Inc. for the declassification of its Class “A” and Class “B” common shares into a single class of common shares and issued the Certificate of Filing of Amended Articles of Incorporation dated 06 October 2026. The amendment was previously approved by the Board of Directors on 29 September 2025 and approved and ratified by the stockholders representing at least two-thirds (2/3) of the outstanding capital stock at the Annual Stockholders’ Meeting held on 13 November 2025. Under the SEC-approved amendment, the authorized capital stock remains P1,200,000,000.00, divided into 7,000,000,000 common shares with a par value of P0.10 per share and 5,000,000,000 preferred shares with a par value of P0.10 per share. The declassification does not increase or decrease the authorized capital stock, change the par value, or change the aggregate number of issued and outstanding common shares.
Other Relevant Information
The Corporation will coordinate with The Philippine Stock Exchange, Inc. (“PSE”), the Philippine Depository & Trust Corp. (“PDTC”), its stock and transfer agent, and other relevant parties regarding the operational implementation of the declassification, including the applicable ISIN/security identifiers, trading and settlement arrangements, and effective implementation date. The Corporation will make the appropriate further disclosure once the implementation timetable is confirmed. Attached: (1) SEC Certificate of Filing of Amended Articles of Incorporation dated 06 October 2026; and (2) SEC-approved Amended Articles of Incorporation