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Shares of SK Hynix jumped nearly 12% to 18,80,000 won at market close on Monday, owing to strong demand for AI chips and gains made by American AI-related chip stocks, Nikkei Asia said in a same-day report.SK Hynix is a key conventional DRAM chip and advanced high-bandwidth memory chip supplier to global AI giants, and is also securing long-term supply agreements as technology companies around the world raise their AI infrastructure spending, the report said.As of the end of the trading session, SK Hynix had a market capitalization of about 1.3 quadrillion won, nearing the $1 trillion mark set by Berkshire Hathaway, while that of Samsung Electronics reached 1.7 quadrillion won, it said.Shares of Samsung Electronics added over 6% at market close on Monday.