Bitcoin (BTC) posted lower return volatility than South Korea’s benchmark stock index this year, Bloomberg data shows. A national stock gauge just out-swung crypto’s most-watched asset.
By comparison, the KOSPI’s daily returns swung 63% from their average pace this year. Bitcoin’s swung just 48%. Two chipmakers integral to the South Korean market are driving the gap.
Two Stocks Steer an Entire Index
Samsung Electronics and SK Hynix supply the memory chips powering the AI boom. Their shares have surged so fast that the pair now make up more than half the KOSPI’s weight. Listed affiliates push that share even higher.
That concentration turns Korea’s benchmark into a leveraged AI bet. In turn, it ties the market’s mood to Wall Street sentiment. When the KOSPI closed at a record high in June, more than 650 of its 831 stocks fell, Bloomberg reported.
SK Hynix later lost 27% of its value over three trading days amid concerns about data center spending. It then jumped by Korea’s 30% daily limit once sentiment reversed. That mirrors an earlier AI memory stock selloff that hit the chipmaker this month.
Retail Leverage Fuels the Swings
Individual investors hold most of the leveraged exchange-traded funds (ETFs) that track Samsung and SK Hynix. Those funds amplified the swings further. At their peak, the ETFs and underlying stocks made up more than 70% of daily trading value. Korea’s stock market totals $3.4 trillion.
Meanwhile, the volatility forced the Korea Exchange to halt trading nine times this year. That compares with just once in 2024. That said, the pace follows a historic stock market crash that already ranks among Korea’s worst on record.
Finance Minister Koo Yun Cheol acknowledged regulators approved the leveraged products too quickly. Officials have since pledged exposure caps and higher trading costs to curb retail risk.
Bitcoin’s Year Hasn’t Been Calm, Just Steadier
Bitcoin opened 2026 near $88,000 and now trades around $63,000, a decline of roughly 29% year to date. Measured against its October 2025 all-time high of $126,000, the drop widens to nearly 50%.
The slide has not been a single sharp shock. Bitcoin fell to lows near $60,000 in February, recovered briefly, then broke down again to roughly $57,000 in June. Traders have tied the pressure to slowing ETF inflows and capital rotating into AI-linked stocks instead.
That grinding, one-directional decline is likely why Bitcoin’s volatility reading looks tame next to the KOSPI’s. Bloomberg’s measure captures how sharply daily returns swing from their own average, not the size of the overall move.
