The meteoric rise of Samsung Electronics and SK Hynix, fueled by an insatiable global appetite for AI-capable memory chips, has created an ironic dilemma for international asset managers. This year alone, the two semiconductor behemoths saw their stock prices surge by 147% and 245% respectively, transforming them into the darlings of the tech-heavy market. However, this explosive growth has triggered internal risk-management tripwires, forcing many institutional investors to sell off shares of companies they otherwise remain bullish on.
The culprit is the '10% concentration rule,' a common mandate in mutual fund and institutional portfolios designed to prevent overexposure to any single equity. As the valuations of Samsung and SK Hynix ballooned, their weight within portfolios naturally crossed these regulatory thresholds. Major players like Zurich-based GAM Investment Management and Singapore’s Jupiter Asset Management have reportedly been forced to rebalance, liquidating portions of their holdings to maintain compliance with diversification standards.
This technical sell-off has reached historic proportions, contributing to a record $63.6 billion net outflow from South Korean equities in a single month—the largest such exodus since data tracking began in 1999. Goldman Sachs estimates that diversification rules alone have sparked approximately $69 billion in selling pressure since late October. For funds focused specifically on the South Korean market, the struggle to manage the sheer dominance of these two entities has become an exercise in volatility management rather than traditional stock picking.
To circumvent these limits, some institutional investors are shifting their strategies toward indirect exposure. Rather than holding the primary stock, capital is being diverted into affiliates, holding companies, or insurance subsidiaries that maintain large stakes in the semiconductor giants. While this provides a temporary workaround, the underlying issue remains: the extreme concentration of the South Korean market makes it increasingly difficult for global diversified funds to participate in the memory boom without hitting a regulatory ceiling.