$Cogent Communications Group(CCOI)$ 8-K - Current report Filed: 2015-04-17 AccNo: 0001104659-15-028374 Size: 164 KBItem 1.01: Entry into a Material Definitive AgreementItem 1.02: Termination of a Material Definitive AgreementItem 5.07: Submission of Matters to a Vote of Security HoldersItem 9.01: Financial Stat 网页链接