A three-way tie for first with 3.5 points each: GM Nigel D. Short, GM Sergey Tiviakov and David Begoray.
Complete results can be found at: http://www.islandnet.com/~jberry/cycc/4sO.htm
PGN realtime file of Round 4 is available at the Monroi site at: http://www.monroi.com/tournamentgate/CanOpen07/games.html
Games can be replayed online at: http://www.bjdy.com/juniorchess/CO_07_games/index.html
(courtesy Jay Zhao of British Columbia)
Pairings for Round 5 will be available around 12:00PM EDT at: http://cocycc.pbwiki.com/results