South Korea's stock exchange has issued another warning over the rapid rise in shares of SK Hynix Inc., which have surged as much as 230% on a year-to-date basis due to the artificial intelligence boom.

The Korea Exchange has issued an "investment caution" on the stock for one day. This is a similar warning to the one issued in November. Such a warning does not halt trading but is a message that investors should proceed with caution.

SK Hynix is a key supplier of high-bandwidth memory to Nvidia, the world's most valuable company. Chip and AI-related stocks have remained volatile in recent times on concerns of a bubble building up within that space.

Exchanges generally issue such warnings due to sudden and unexplained large changes in share price or volumes.

The stock had gained 6% on M

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