Castec Korea corrects filing to revise joint-holder contract date to Feb. 14, 2024

• Castec Korea filed a corrected large-shareholding report dated Sept. 23, 2026, tied to a Feb. 2024 joint-holding arrangement.
• Joint-holding contract date for Jeong Hae-il revised to Feb. 14, 2024 from Feb. 15, 2024 to match the written agreement.
• Changes for Oh Bong-seok, Choi Gyeong-seon, Jeong Hae-il reclassified as “other” from on-market buying since no share trades occurred.
• Acquisition prices for those three holders amended to “-” from 2,475–2,485, reflecting contract-based inclusion rather than purchases.

Disclaimer: This news brief was created by Public Technologies (PUBT) using generative artificial intelligence. While PUBT strives to provide accurate and timely information, this AI-generated content is for informational purposes only and should not be interpreted as financial, investment, or legal advice. Castec Korea Co. Ltd. published the original content used to generate this news brief via DART, the regulatory disclosure system operated by the South Korea Financial Supervisory Service (FSS) (Ref. ID: 20260923000307), on September 23, 2026, and is solely responsible for the information contained therein.