SK Hynix Shares Draw Second Exchange Notice on Blistering Rally

South Korea’s main bourse operator issued its second warning in about one month over the rapid rise in shares of SK Hynix Inc., which have more than tripled this year on the artificial intelligence boom.

Korea Exchange issued an “investment caution” on the stock for one day on Tuesday. The warning, which follows a similar one in early November, doesn’t halt trading but signals that investors should proceed with caution. The shares fell as much as 1.7% in early trading.