No numbers cited, but there's a claim that flash orders are more common with options exchanges than with equities. http://online.wsj.com/article/SB125011050709126957.html
Things get interesting when flash trading interacts with dark liquidity. The result is a combined market that is increasingly opaque to non-institutional traders. http://online.wsj.com/article/SB124906083065697257.html
More information about formatting options
No numbers cited, but there's a claim that flash orders are more common with options exchanges than with equities.
http://online.wsj.com/article/SB125011050709126957.html
Things get interesting when flash trading interacts with dark liquidity. The result is a combined market that is increasingly opaque to non-institutional traders.
http://online.wsj.com/article/SB124906083065697257.html