A List of innovators in Exchanges (Wiki)

BATS exchange from Kansas, TX with global businesses (10yrs old) and publicly traded. No.1 in ETF listings.

IEX exchange in the US, recent SEC approval IEX to remove the advantage given to its affiliated routing broker dealer.

LTSE (Long term stock exchange) focus on long term investing and fixing the short term trading problems. Not live yet.

Aequitas Neo Exchange in Canada, two years old with a focus on long term investing.