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)

Aug 25, 2026

2. SEC Identification Number

A1996-11593

3. BIR Tax Identification No.

005-038-428-000

4. Exact name of issuer as specified in its charter

MANILA WATER COMPANY, INC.

5. Province, country or other jurisdiction of incorporation

QUEZON CITY, PHILIPPINES

6. Industry Classification Code(SEC Use Only)

7. Address of principal office

MWSS ADMINISTRATION BUILDING 489 KATIPUNAN ROAD BALARA QUEZON CITY Postal Code 1105

8. Issuer's telephone number, including area code

09171547921

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

Not Applicable

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 Shares	2,607,760,172
Preferred Shares	35,637,560,638

11. Indicate the item numbers reported herein

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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.

Manila Water Company, Inc.MWC

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
Share Buy-Back Program
Background/Description of the Disclosure
On 25 August 2026, the Board ratified the purchase of 500,000 common shares at ₱35.20 per share, for an aggregate consideration of approximately ₱17.6 million. This is pursuant to the Company's Share Buy-Back Program, with the Board ratifying the purchase today and authorizing the Chief Finance Officer and Treasurer to effect further purchases at such prices determined to be advantageous to the Company and its shareholders.
Other Relevant Information
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