Read about TDA in this Sep. 11 2012 PR: "TD Ameritrade Daily Trading Volume Down 9% in August from July, Down on Year " http://online.wsj.com/article/BT-CO-20120911-706432.html

Quote from the PR: "Also in July, Ameritrade agreed to cooperate with the attorneys general of Connecticut, Iowa and Missouri as part of a multistate investigation into potential violations of antitrust law in the retail-brokerage industry. "