(Updated - June 11, 2015 4:09 PM EDT)Twitter (NYSE: TWTR) CEO Dick Costolo to step down.UPDATE - The company disclosed ...

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Twitter (TWTR) Continues to Flounder Following CEO NewsJune 15, 2015 9:59 AM SunTrust's Peck Weighed in on Twitter (TWTR) Following Costolo ResignationJune 12, 2015 7:15 AM Twitter (TWTR) M&A 'Slightly More Possible' - Deutsche BankJune 12, 2015 7:13 AM Twitter (TWTR) Costolo Resignation Driven by Shareholder Consensus, Jefferies NotesJune 12, 2015 6:45 AM Twitter (TWTR) Costolo Resignation Not a Surprise, Sterne Agee CRT SaysJune 12, 2015 6:36 AM Brean Capital Maintains Buy on Twitter (TWTR) as CEO Replaced; Reaffirmed Guidance Should Calm FearsJune 12, 2015 6:27 AM Twitter (TWTR) Says Focus is to Remain IndependentJune 11, 2015 5:29 PM Form 8-K TWITTER, INC. For: Jun 11June 11, 2015 4:07 PM Twitter (TWTR) Announces Installed App Category Targeting for Mobile AddsJune 10, 2015 2:14 PM Form 4 TWITTER, INC. For: Jun 05 Filed by: Roetter AlexanderJune 9, 2015 8:42 PM