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By Manishi Raychaudhuri HONG KONG, Sept 8 - South Korea's brutal summer equity rout showed how margin debt can turn a selloff into a market-wide tailspin. Korea's AI giants remain exposed, but the next Asian crash may follow different fault lines. The sharp correction in South Korean equities, which saw the KOSPI collapse 39% from June 22 to July 30, has been widely attributed to the rapid buildup and subsequent unwinding of margin loans held by retail investors. Driven by AI euphoria, millions of South Korean retail investors used broker loans to buy the equities of tech giants as well as highly volatile single-stock leveraged exchange-traded funds . This helps explain how the KOSPI spiked 116% in the year through June 22. When tech shares tumbled in June on worries about the sustainability of AI capital spending, falling collateral values triggered widespread margin calls, or demands for additional cash or securities to cover losses. Lacking the cash to meet these demands, traders faced automatic, forced liquidations. Brokers dumped shares from over a million leveraged accounts, creating a self-reinforcing cascade that erased billions in market value even when fundamentals had not materially changed. Margin loans have also risen sharply in other Asian markets, raising major red flags. India's Margin Trading Facility book has surged from just over $1 billion at the end of 2020 to $16.3 billion as of August 31, according to data from the National Stock Exchange and the Bombay Stock Exchange. Meanwhile, China's outstanding margin balance, according to Shanghai Stock Exchange data, has tripled from $68 billion at the beginning of 2019 to $200 billion as of August 31. And Japan's margin-loan balance has almost doubled from $18 billion at the beginning of 2020 to over $35 billion as of August 31, according to Japan Exchange Group. The question now is whether this means another major leverage-driven correction could be coming. SMALL BUT MIGHTY Today’s margin loan balance throughout Asia may appear modest as a proportion of total equity market capitalization. India’s and Japan’s represent just 0.3% and 0.45% of their respective market caps. However, when South Korea's margin balance was at its recent peak in late June of 38.7 trillion won , that represented barely 0.6% of the market's cap – and it still caused massive damage when it unwound. That makes the picture in China all the more concerning. China's Shanghai Stock Exchange margin balance of 1.34 trillion yuan , as of August 31, equates to 2% of its market cap, significantly higher than its peers. China's margin balance is also notable in that it is 8% higher than its previous peak in May 2015. That spike preceded a 48% crash in the Shanghai Composite Index over the next eight months. The comparison is not exact, of course, given changes in market rules and regulatory oversight since then, but the scale of leverage remains a red flag. DIFFERENT POCKETS OF RISK Another major risk to examine is concentration. South Korea provided a stark lesson on the destructive power of concentrated margin loans. When the KOSPI margin balance reached its peak in the third week of June, Samsung Electronics and SK Hynix together accounted for 9.09 trillion won , representing nearly 31% of total KOSPI leverage. On the one hand, that is unsurprising, as the two companies make up over 30% of the highly concentrated KOSPI. But, nevertheless, this crowding still helps explain why Samsung Electronics and SK Hynix plummeted by such large amounts – 43% and 55%, respectively – when margin loans unwound. Margin loans in both China and India are also concentrated, though in very different areas. Chinese traders, like their Korean counterparts, have channelled leveraged capital primarily into large-cap electronics, semiconductor and telecoms stocks. Given the enormous size of many of these firms, a rapid unraveling of margin loans could have a huge market impact. Japan's margin loan profile seems to mirror Korea's mania for large-cap technology titans. Data from the Japan Exchange Group indicates that margin buying is primarily concentrated in semiconductor and electronic component names such as Kioxia Holdings, Murata Manufacturing, Tokyo Electron and Ibiden. Indian retail traders, on the other hand, have allocated a significantly greater share of their margin capital to small- and mid-cap stocks. According to data from NSE and BSE, 55% of Indian margin loans are in micro-, small- and mid-cap stocks. In a sharp selloff, investors may be forced to sell larger, more liquid stocks to meet margin calls, amplifying the impact of the correction. TREADING CAREFULLY It’s important to note that regulators have noticed the growing risk posed by margin loans and are acting. South Korea’s Financial Services Commission this month unveiled several measures to curb highly volatile single-stock ETFs. India’s RBI in July banned the use of Loans Against Shares for buying securities or applying for IPOs. The China Securities Regulatory Commission in January also raised the minimum margin requirement to 100% for new margin accounts. These changes haven’t eliminated the risk, but simply stopped it from metastasizing. Moreover, the attractiveness of margin loans depends critically on borrowing costs. It’s no surprise that Korean equities tumbled after the Bank of Korea warned about rate hikes in June. And interest rates in much of the region – with the glaring exception of China – appear to be heading up. For investors, navigating Asian equities in this high-leverage era will require close vigilance: the next margin-driven fault line may not replicate South Korea's footprint, but could instead target the unique pockets of leverage quietly compounding across the region. Enjoying this column? Check out Reuters Open Interest , your essential new source for global financial commentary. Follow ROI on LinkedIn, and X. And listen to the Morning Bid daily podcast on Apple, Spotify, or the Reuters app. Subscribe to hear Reuters journalists discuss the biggest news in markets and finance seven days a week. This article was generated from an automated news agency feed without modifications to text. Catch all the Business News , Market News , Breaking News Events and Latest News Updates on Live Mint. Download The Mint News App to get Daily Market Updates. Oops! Looks like you have exceeded the limit to bookmark the image. Remove some to bookmark this image.
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