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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	Sep 30, 2026

Description of the Disclosure
Please see attached letter dated 14 October 2026. The 19,443,998 treasury shares were 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	379,168,224
PCD Nominee - Filipino	347,959,990
PCD Nominee - Non-Filipino	31,208,234
Number of Certificated Common Shares	478,806,768

Change from previous submission
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