But May 6 could happen again and the SEC needs to be prepared, according to James Angel, a Georgetown finance professor who has been warning about the possible negative effects high frequency trading since last year.

FORBES: High Frequency Traders Face SEC/CFTC Panel

Overdahl insists, however, that the firms are not adopting a new name because of any negative overtones to high-frequency trading, which remains important to many of them.

FORBES: Market Players

They ranked the locations based on frequency of positive and negative words using the Mechanical Turk Language Assessment word list.

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