KCG Sinks as Executives Depart Speed Trader Turned Broker

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KCG Holdings Inc., the trading firm formed in the aftermath of Knight Capital Group Inc.’s near collapse, is having a September to forget.

Its stock has plunged 14 percent, worse than the Standard & Poor’s 500 Index’s 1.8 percent slump, and at one point fell eight straight days, tying the record for its longest slump. At least five senior managers have left in September as KCG fired 4 percentBloomberg Terminal of about 1,200 workers.