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KRX Issues Warning on 'Closing Price' Confusion Following After-Market Launch
Commercial Services · Financial Publishing/Services · yonhap_finance · 2026-09-17
The Korea Exchange has clarified that the official closing price remains the regular market finish, urging investors to distinguish it from after-market data.
What Happened
Clarifying Closing Price: The Korea Exchange (KRX) has reiterated that the official closing price is determined at the end of the regular trading session at 3:30 PM. It clarified that prices formed during the after-market session do not constitute the official closing price.
Data Display Discrepancies: Some financial portals have been displaying after-market final prices as the daily closing price, leading to potential confusion. The exchange advises market participants to verify official closing data through the KRX Information Data Marketplace (KDM).
Operational Accuracy: The guidance aims to prevent errors in corporate disclosures and administrative tasks that rely on official closing prices, such as market capitalization calculations and additional listing fees. Incorrect data usage could lead to unnecessary administrative burdens like refund processes.
Market Stability Measures: By issuing this notice to listed companies, the KRX seeks to ensure a smooth transition and operational stability following the introduction of the after-market. The exchange remains committed to providing clear guidelines to prevent market misinformation.