Copies Of All Email Correspondence Relating To The ASX CHESS Outage In December 2024, Between Email Addresses Containing Asx.com.au And Asic, For The Time Period December 19 2024 To February 6 2025.

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ASIC received correspondence with ASX between December 19, 2024 and February 6, 2025 regarding the ASX CHESS settlement system outage on December 20, 2024. The incident prevented batch settlement completion on the designated settlement day—described as unprecedented—forcing rescheduling to December 23, 2024. ASX's incident review identified a root cause: a memory allocation logic error introduced in 2014 that remained undetected until triggered by specific December 2024 circumstances. Trading and clearing services operated normally; only batch settlement was affected. ASX committed $1 million in customer credits and outlined remediation steps and enhanced incident management protocols. ASX CEO Helen Lofthouse apologized directly to customers and committed to preventing reoccurrence. The disclosure comprises ASX's public media release and incident review materials shared with ASIC as the primary financial market regulator.