Form 4 COGENT COMMUNICATIONS For: Apr 10 Filed by: Chang John B.
Form 8-K COGENT COMMUNICATIONS For: Apr 11
Form 8-K COGENT COMMUNICATIONS For: Apr 04
Form 4 COGENT COMMUNICATIONS For: Apr 04 Filed by: SCHAEFFER DAVE
Form 4 COGENT COMMUNICATIONS For: Mar 31 Filed by: Howell Deneen C