Tech stocks are on track for a record $75 billion inflow this year, according to Bank of America’s weekly flow report released Friday, reflecting continued investor demand despite concerns over high valuations.

Tokyo stocks fell sharply Tuesday, with the benchmark Nikkei 225 sliding more than 3 percent, as declines in technology shares and concerns over the U.S. economy weighed on sentiment.

Japan’s key stock indexes soared to record highs on Friday, with the benchmark Nikkei index closing above the 52,000 mark for the first time, buoyed by strong gains in technology shares following robust earnings reports from major U.S. tech companies.

Tokyo stocks ended lower on Thursday, dragged down by weak semiconductor and technology shares and investors locking in recent gains.