South Korea’s Financial Services Commission approved revisions to the Korea Exchange disclosure rules that will require all KOSPI-listed companies to publish a corporate governance report from 2026, using a “comply or explain” approach. The corporate governance report discloses a firm’s compliance status against key corporate governance principles. The regime was introduced as voluntary disclosure in 2017 and has been progressively expanded as a mandatory requirement; the change extends coverage from 541 firms currently subject to the duty (those with total assets of at least KRW 500 billion as of end-2024) to 842 firms (all KOSPI-listed firms as of end-2024). To support implementation, the Korea Exchange and the Korea Listed Companies Association plan preparatory guidance, one-on-one consultations, on-the-job training for compliance and executive officers, and regional information sessions and workshops.