Cameron Donald won the main Cookstown 100 race from Scot Keith Amor and Manx rider Conor Cummins on Saturday.
Robert Dunlop was the winner of the 125cc race
Donald also took the honours in the 600 race with Amor and Cummins again on the podium, followed by Adrian Archibald, Raymond Porter and John Donnan.
Amor won the Open race, which was run in two parts, ahead of Donald, Porter, Cummins, Donnan and Archibald.
Robert Dunlop won the 125 race and Barry Davidson took the 250 win from Ian Morrell and Davy Morgan.
Michael Dunlop and Nigel Moore both retired in the 125cc event.
William Dunlop sustained a suspected broken wrist in a practice crash on Friday night.