Korean Investors Bought $73M of '3x Semiconductor Short' — What Is an Inverse ETF?

100 Billion Won Bet During Chuseok Holiday

While KOSPI was closed for Chuseok, Korean retail investors known as 'Seohak Gaemi' (individual investors who buy U.S. stocks) purchased $73.51 million — roughly 100 billion won — worth of ETFs on U.S. markets. And not just any ETF: it was a '3x inverse semiconductor' ETF that profits when chip stocks fall. Since semiconductor stocks did in fact drop during the holiday, some of those investors likely came out ahead.

What Is an Inverse ETF?

A regular ETF makes money when stock prices go up — if the index rises 1%, you earn 1%. An inverse ETF works the opposite way: it makes money when prices go down. If the semiconductor index drops 1%, you gain 1%. If it rises 1%, you lose 1%. It's a tool designed to profit in a falling market.

Why Is It Risky?

If you call the direction right, a 3x inverse ETF can deliver large gains quickly. But if you're wrong, losses are also tripled. What makes it even more dangerous is a built-in drag called 'decay over time'. For example, if semiconductors rise 10% and then fall 10%, you don't end up back at your starting point. Because the 3x multiplier compounds daily, the value quietly erodes the longer you hold it. Experts often say: "3x leveraged products are short-term trading tools, not long-term investments."

Why Did Korean Investors Buy This?

Before the holiday, U.S. Treasury yields broke through 5% and the Federal Reserve signaled more rate hikes ahead — conditions that often weigh on semiconductor stocks. Many investors expected chip stocks to fall, and they did: semiconductors dropped 1.2% during the holiday period. Investors used an inverse ETF to bet on that short-term dip. That said, short-term predictions like this are often wrong. With a 3x product, a single bad call can mean a very large loss.