Tech sell-off widens as South Korea’s KOSPI index crashes 8.3%, triggering circuit breakers

South Korea’s KOSPI index nosedived 8.3% on June 8, closing at 7,484.41 and triggering circuit breakers shortly after the opening bell.

Just six days earlier, the KOSPI had been sitting at 8,801.49. That means roughly 15% of its value evaporated in less than a week. The index had gained approximately 166% over the preceding year, riding a wave of AI enthusiasm and semiconductor demand.

What’s driving the sell-off

Three forces converged to create this particular mess. First, robust US jobs data raised expectations that the Federal Reserve will pursue additional rate hikes. Second, there’s a significant unwinding of AI-related investment positions happening globally. The KOSPI had been one of the primary beneficiaries of the AI trade, with semiconductor giants like Samsung Electronics and SK Hynix acting as proxies for AI infrastructure spending. Third, escalating geopolitical tensions between Iran and Israel are adding a layer of risk-off sentiment.

Samsung Electronics shares dropped 10.2% on the day. SK Hynix, which has become one of the world’s most important suppliers of high-bandwidth memory chips for AI applications, fell 7.7%.

The crypto connection

Bitcoin was trading around $63,000 amid the chaos. South Korea has long been one of the most active cryptocurrency trading markets in the world, and capital flows between Korean equities and digital assets tend to be intertwined.

The 166% rally the KOSPI had logged over the prior year created enormous paper wealth among Korean investors, many of whom are also active crypto traders. Some of that wealth just disappeared.

What investors should be watching

The variable that matters most right now is the Federal Reserve. If upcoming US economic data continues to come in hot, rate hike expectations will solidify, putting further pressure on tech valuations globally. The KOSPI’s circuit breakers triggered because the selling was too fast and too concentrated.

Geopolitical risk between Iran and Israel has a tendency to escalate in unpredictable ways, and energy markets react first, followed by broader risk assets. If oil prices spike on supply concerns, that adds inflationary pressure, which gives the Fed even more reason to stay hawkish.

The semiconductor stocks at the center of this sell-off, Samsung and SK Hynix, are also critical to the AI infrastructure buildout. Bitcoin’s relative stability around $63,000 during the KOSPI crash suggests the correlation between tech equities and Bitcoin may be loosening, at least temporarily.

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