Korea’s proposed ban on duplicate affiliate listings is the clearest signal yet that Seoul wants a “Korea premium,” not just a narrower discount

The reform matters because duplicate listings are not a marginal feature of Korea’s market. Reuters reported that Financial Services Commission Chairman Lee Eog-won said such listings account for roughly 20% of market capitalization, a far higher share than in most other markets. Investors have long argued that when a parent and its affiliate are both listed, cash flows, assets, and strategic value can be split in ways that leave minority shareholders with weaker claims and more opaque governance. By targeting that structure directly, the government is trying to address a core reason Korean equities have historically traded at lower valuation multiples than global peers.

This is also not an isolated reform. It follows February’s Commercial Act revision, which requires listed companies to cancel newly acquired treasury shares within one year and existing treasury shares within a set transition period, unless they meet tightly defined retention requirements. That law was designed to curb the long-standing use of treasury shares as a control mechanism by corporate insiders, and it complemented earlier moves to strengthen minority shareholder rights and tighten fiduciary obligations. Taken together, the treasury-share reform and the proposed duplicate-listing ban show that Seoul is no longer relying on voluntary value-up encouragement alone; it is moving toward harder legal constraints on governance practices that have depressed valuations.

The market reaction suggests investors believe these measures can meaningfully alter the valuation regime. Reuters reported that President Lee said the government was aiming for a Korea premium, while also signaling readiness to expand a 100 trillion won market-stability fund if volatility returns. That combination of structural reform and backstop support has helped sustain a remarkable rally: Reuters said the KOSPI is up 41% in 2026 after surging 76% in 2025. The implication is that governance reform is no longer being treated as a secondary policy theme; it has become a direct macro driver of equity allocation into Korea.

The remaining question is execution. Detailed rules for outlawing duplicate listings still have to be written, and any reform affecting roughly one-fifth of market capitalization will inevitably face resistance from chaebol groups that have long used complex affiliate structures for control and financing flexibility. But even before implementation, the policy direction is clear enough to matter for markets. If Seoul follows through, Korea’s rerating story may shift from being a cyclical rally aided by AI enthusiasm and currency stabilization to a more durable governance-led revaluation of corporate equity.