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 25, 2026

2. SEC Identification Number

A1996-11651

3. BIR Tax Identification No.

005-393-442-000

4. Exact name of issuer as specified in its charter

MAYNILAD WATER SERVICES, INC.

5. Province, country or other jurisdiction of incorporation

Philippines

6. Industry Classification Code(SEC Use Only)

7. Address of principal office

Maynilad Building, MWSS Complex, Katipunan Avenue, Pansol, Quezon City Postal Code 1108

8. Issuer's telephone number, including area code

(+632) 8981-3483

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 Shares	7,402,603,600
Series A Blue Bonds Due 2029	9,000,000,000
Series B Blue Bonds Due 2034	6,000,000,000

11. Indicate the item numbers reported herein

Item No. 9

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.

Maynilad Water Services, Inc.MYNLD

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
Submission of the Initial Assessment Report covering the period ended December 31, 2025 for Maynilad Water Services, Inc. in connection with MYNLD’s Philippine Green Equity Label
Background/Description of the Disclosure
In compliance with the reportorial requirements for the Philippine Green Equity Label, please refer to the attached: 1) Initial Assessment Report prepared by an independent External Review Provider which designates that Maynilad is aligned with the requirements of the Philippine Green Equity Label. 2) Notarized Sworn Certificate duly signed by our Chief Sustainability Officer
Other Relevant Information
None