Last year, Citadel, Merrill Lynch, UBS, Credit Suisse Group, Citigroup and Morgan Stanley collectively bought up more than 80% of the Philadelphia Stock Exchange and are plowing resources into its electronic trading systems with a goal to route more stock order flow through it.

FORBES: Magazine Article

Last year, Citadel, Merrill Lynch (nyse: MER - news - people ), UBS (nyse: UBS - news - people ), Credit Suisse Group (nyse: CSR - news - people ), Citigroup (nyse: C - news - people ) and Morgan Stanley (nyse: MS - news - people ) collectively bought up more than 80% of the Philadelphia Stock Exchange and are plowing resources into its electronic trading systems with a goal to route more stock order flow through it.

FORBES: A New Kind Of Exchange