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 17-12-A - List of Top 100 Stockholders (Common Shares) Reference: Section 17.12 of the Revised Disclosure Rules

Type of Securities

• Common

For the period ended	Dec 31, 2025

Description of the Disclosure
In compliance with Article VII, Section 17.12 of the Revised Disclosure Rules of the Exchange, we submit herewith the list of the Top 100 Stockholders of Manila Water Company, Inc. as of December 31, 2025 The additional information that we are required to disclose may be found on the attached Table of Comparison of Figures as September 30, 2025 and as of December 31, 2025.

Number of Issued Common Shares	2,885,795,897
Number of Treasury Common Shares, if any	284,296,625
Number of Outstanding Common Shares	2,601,499,272
Number of Listed Common Shares	2,044,494,601
Number of Lodged Common Shares	1,294,812,175
PCD Nominee - Filipino	878,168,374
PCD Nominee - Non-Filipino	416,643,801
Number of Certificated Common Shares	1,590,983,722

Change from previous submission
Please see attached summary of changes from previous submission.