Tokyo, July 17 (Jiji Press)--Japan's key Nikkei 225 stock average on Friday marked the fifth-biggest one-day point loss on record, hurt by heavy selling of semiconductor- and artificial intelligence-related issues. The index of 225 major issues listed on the Tokyo Stock Exchange's Prime section finished the day at 64,141.12, down 2,694.42 points, or 4.03 pct, from Thursday. Memory chip maker Kioxia Holdings, chipmaking equipment maker Tokyo Electron and other major Nikkei component issues bore the brunt of the selling, causing the key index to lose over 4,100 points at one point in the afternoon. END [Copyright The Jiji Press, Ltd.]