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)

Nov 5, 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	2,605,510,172
Preferred Shares	3,563,756,068

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 14-1 - Notice of Analysts'/Investors' Briefing References: Section 14 of the Revised Disclosure Rules

Subject of the Disclosure
Notice of Analysts’ Briefing
Background/Description of the Disclosure
Manila Water Company, Inc. will hold a briefing on its financial and operating results for the first three quarters of the year on November 10, 2026 (Tuesday) at 2:00 P.M. The briefing will be conducted virtually. Analysts intending to attend the briefing should notify the Company’s Investor Relations Department by e-mail to [email protected].

Type of Briefing	Analysts' Briefing
Subject of the Briefing	Financial and Operating Results for the first three quarters
Date of the Briefing	Nov 10, 2026
Time	2:00 P.M.
Venue	To be conducted virtually
Contact Person	MWCI Investor Relations Department
Contact Details	[email protected]

Other Relevant Information
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