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Form SCHEDULE 13G/A COGENT COMMUNICATIONS Filed by: Turtle Creek Asset Management Inc.
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Form SC 13G/A COGENT COMMUNICATIONS Filed by: VANGUARD GROUP INC
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Form SC 13G/A COGENT COMMUNICATIONS Filed by: VANGUARD GROUP INC
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Form SC 13G/A COGENT COMMUNICATIONS Filed by: RENAISSANCE TECHNOLOGIES LLC
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Form SC 13G/A COGENT COMMUNICATIONS Filed by: VANGUARD GROUP INC
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Form SC 13G/A COGENT COMMUNICATIONS Filed by: FRONTIER CAPITAL MANAGEMENT CO LLC
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Form SC 13G/A COGENT COMMUNICATIONS Filed by: VANGUARD GROUP INC
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