anyone have an idea of what's driving this?
Volume has been trending down since 2003 - maybe all the buyers are already in?
More people are trading options than equities. Options are in a dramatic up trend.
The bar for trading futures is extremely low these days - it used to take a lot of $ to trade futures & was used more for hedging by the more sophisticated informed traders. Now every greedy noob that can afford to open a lemon aid stand is opting to trade futures over equities.
The problems were recently documented in a research note by Credit Suisse titled “The Incredible Shrinking Universe of Stocks.” The bank documented that the total number of companies listed on the United States stock market plummeted by nearly half, to 3,671 last year from 7,322 in 1996.
Companies get bought or go out of business, but new companies are not replacing them. In 1996 there were 706 initial public offerings, but in 2016
there were only 105. The downturn affects all sectors, and last year there were only 30 new
private equity offerings, the “lowest level since 2009".
Been doing daily stock scans since the mid 90's - every quarter the list gets shorter.