Four members of the Lee family, which controls Samsung, are now the richest people in South Korea, marking the first time that the country's top four billionaires all hail from the same family. Shares of their crown jewel, Samsung Electronics, surged 40% over the past month, driven by soaring demand for its memory chips needed for AI.

South Korea's richest person, Jay Y. Lee, the executive chairman of Samsung Electronics, now boasts a net worth of $34 billion, according to Forbes’ Real-Time Billionaires list, up by $12.4 billion from late March when net worths for the list of the country’s 50 richest was finalized. His younger sisters Boo-jin ($12.4 billion) and Seo-hyun ($12 billion) and mother........

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