Guy Martin and William Dunlop have both won two races at the Cookstown 100.
Tyco BMW rider Martin took the honours in the two Superbike events, winning the feature race from Derek Sheils and Dean Harrison after Michael Dunlop came off without injury.
Martin held off Michael in Superbike race one, with Sheils in third place.
William Dunlop won both Supersport 600 outings, Harrison and Derek McGee taking up the runner-up spots, while Michael Dunlop won the Supertwins race.
William, who was riding the CD Yamaha which he will campaign in the international road races this season, saw off Harrison by five seconds in Supersport race one, Ballyclare's Jamie Hamilton completing the podium for the BE Cookstown Racing team.
James Cowton, McGee and Sheils made up the top six leaderboard.
Mar-Train Yamaha rider Harrison was third in Supersport race two, Hamilton and Sheils following home the Yorkshireman.
McGee was fourth in Superbike race one, followed by William Dunlop and Hamilton.
Sam Wilson won the 125cc race on a Joey's Bar 125cc Honda, ahead of Dungannon's Nigel Moore.