Tech ETFs now make up 10% of total ETF trading volume this year, up from the usual 4% to 5%, says Bloomberg Intelligence’s Eric Balchunas. The surge helps expla

Tech ETFs now make up 10% of total ETF trading volume this year, up from the usual 4% to 5%, says Bloomberg Intelligence’s Eric Balchunas. The surge helps explain why overall ETF volumes are on track for record highs despite the market’s rise.