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.

Ionics, Inc.ION

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
Please see attached letter dated 12 January 2026. The 19,443,998 treasury shares lodged with PCD are included under PCD Nominee-Filipino

Number of Issued Common Shares	857,974,992
Number of Treasury Common Shares, if any	20,844,000
Number of Outstanding Common Shares	837,130,992
Number of Listed Common Shares	857,974,992
Number of Lodged Common Shares	379,721,724
PCD Nominee - Filipino	350,811,618
PCD Nominee - Non-Filipino	28,910,106
Number of Certificated Common Shares	478,253,268

Change from previous submission
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