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Micron shares plummeted over 13% on Tuesday, falling as South Korea’s Financial Supervisory Service contributed to a global chip sell-off with a warning about risky ETFs tied to memory chip companies like Samsung and SK Hynix.

Micron Technology Inc. Logo Shown on Smartphone with Latest Stock Market Chart

Micron’s stock is up more than 260% on the year.

Photo illustration by Cheng Xin/Getty Images Key Facts

Micron’s stock closed down 13.3% at $1,051.77, erasing two day’s worth of significant gains made by the stock Friday and Monday.

The drop came after Financial Supervisory Service Governor Lee Chan-jin said he regretted not blocking the launch of leveraged exchange-traded funds solely tracking Samsung and SK Hynix, noting their high-risk nature has not stopped retail investors from engaging with them.

Leveraged single stock ETFs are designed for short-term trading and can amplify daily price movements by two or three times, allowing investors to double or triple gains or losses in a single day.

The statement raised questions about whether Micron’s astronomical stock run this year was driven by momentum trading rather than fundamentals.

Micron has soared over 260% since the start of the year, when the company’s stock traded around the $300 mark.

This is a developing story. Check back for updates.

This article was originally published on Forbes.com