*Refers to the latest 2 years of stltoday.com stories. Cancel anytime. In this July 18, 2010, file photo, a TD Ameritrade logo is displayed on the office in Omaha, Neb. (AP Photo/Nati Harnik, File) ...

Despite its many setbacks in 2007, TD Ameritrade Institutional has one measurable edge over bigger rivals — better trade execution, according to its executives.

Talks between rival discount brokers E*Trade and TD Ameritrade about a possible $20 billion merger have rekindled speculation that further consolidation among US retail brokerages could be on the ...