MarketsAI boom mints a new market cap leader for first time in 26 yearsSK Hynix has benefited massively from its position as a key supplier of high-bandwidth memory for AI computing. (Nikkei montage/Source photos by Reuters)KIM JAEWONJune 22, 2026 15:12 JSTSEOUL -- SK Hynix surpassed Samsung Electronics to become South Korea's most valuable company during intraday trading on Monday, the first time Samsung has been knocked out of the No. 1 spot for 26 years.