South Korea's financial authorities are accelerating the shift to a T+1 stock settlement system.
This move aims to shorten the time between a trade and its final settlement from two business days to just one, a significant overhaul of the country's market microstructure. The primary driver behind this urgency is the recent market turmoil linked to newly launched single-stock leveraged ETFs. These products, designed to amplify the daily returns of stocks like Samsung Electronics and SK hynix, attracted enormous trading volumes, reaching nearly KRW 37 trillion within a week of their debut in late May 2026.
However, this surge came with problems. First, the intense trading, or 'churn', generated substantial fee income for brokerages, which the head of the Financial Supervisory Service (FSS) publicly criticized as excessive. Second, the products experienced structural issues, such as significant deviations between their market price and net asset value (NAV), amplifying market volatility, especially as the Korean won weakened.
This situation created a clear causal chain. The ETF-driven instability and fee controversy prompted the FSS to signal regulatory action. This, in turn, provided the political justification for President Lee Jae-myung to order an acceleration of the T+1 transition, framing it as a measure to enhance market fairness and stability. The goal is not just to curb speculative trading but also to align with global standards, as North America has already moved to T+1 and Europe is planning to do so.
It is important to clarify a common misconception. The policy is not primarily about preventing brokers from using client money during the settlement window. Korean law already requires client funds to be segregated. Instead, the focus is on reducing 'system rents'—income that brokerages earn from utilizing deposits and from fees generated by high-frequency trading—and minimizing the counterparty risk that exists in the two-day gap. By shortening this window, regulators hope to create a more efficient and safer market for all investors.
- T+1 Settlement: A system where stock trades are finalized and ownership is transferred one business day after the trade is executed (T), as opposed to two days (T+2).
- Leveraged ETF: An Exchange-Traded Fund that uses financial derivatives and debt to amplify the returns of an underlying index or single stock. A 2x leveraged ETF aims to return twice the daily performance of its benchmark.
- Market Microstructure: The underlying mechanics of a marketplace, including its trading rules, settlement processes, and how prices are determined. It governs how buyers and sellers interact.