From the article > 81% of funds account for 2.4% of dollar volume. So the top 20% see 97.6% of all trading, probably with the top 10% seeing 90% or so. The ET

From the article > 81% of funds account for 2.4% of dollar volume. So the top 20% see 97.6% of all trading, probably with the top 10% seeing 90% or so. The ETF industry is a bit more brutal than the 80/20 rule of thumb.