Looks like top part is only about 1 type of order on 1 of 4 CBOE exchanges and bottom is all volume on all 4 CBOE exchanges. + marketwide volume is way up this year but % of exchange volume is down (with growth of dark trading, lead by OTC retail)
I'm curious about this slide in $CBOE's earnings deck talking about Retail Priority volume (trades where retail orders move to the top of the order book).
They say RP volume has 
, but market share has 
. I guess the reason is cannibalization?pic.twitter.com/hq4ClVCiKJ
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