Update: Earnings Warnings Send Computer Associates, BMC, Entrust, Datastream, Centura Banks Tumbling

Updated from 3:44 p.m. EDT

Wall Street came back from the Independence Day holiday with a vengeance Wednesday, as it punished the latest round of companies to warn that their earnings would fall below analysts' expectations.

BMC Software (BMCS Quote) finished down 14 3/16, or 40%, at 21 5/16 in Wednesday regular trading after hitting a 52-week low of 21 7/16. Entrust Technologies (ENTU Quote) closed down 40 1/2, or 53%, at 36 5/8. And Centura Banks (CBC Quote) fell 3 7/16, or 10%, at 32 1/2. All three companies warned of earnings shortfalls prior to the market open Wednesday. ...