@EconomPic I dug in to their 606 data for March. 

For the month:

SP500
$2.7mm (366mm shrs) @ .0074/share
non-SP500
$14.7mm (6.4bn shrs) @ .0023/share
Options
$28.1mm (54.4mm contracts) @ .52/contract

Avg SP500 $136.04/shr..   $100's of Billions to Trillions in notional/qtr.