Leverage ETFs now account for 13% of ETF trading but just 1% of assets, underscoring how much market activity is concentrated in a small corner of the industry.

Leverage ETFs now account for 13% of ETF trading but just 1% of assets, underscoring how much market activity is concentrated in a small corner of the industry. Balchunas says volume has risen 10-fold in 5 years, with chip and tech exposure a key risk.