Cameron Donald comfortably retained his Enkalon Trophy crown at Bishopscourt, winning the feature race by 11 seconds from runner-up Lee Johnston.
Denver Robb, Brian McCormack, William Dunlop and Stephen Thompson completed the top six.
Australian Donald also won both Irish Superbike events at the meeting - and two Supersport 600cc events.
David Haire secured a Supersport win, while Ryan Farquhar won two Supertwins races and Andrew Irwin one.
Robert English won two 125cc races and Nigel Percy one, while Percy and Thomas Lawlor were 250cc winners.
On Friday, Donald won Irish Superbike race one convincingly from Wilson Craig Honda team-mate Dunlop, with Robb third.
Haire won the opening Supersport 600cc race on Friday, with Timothy Elwood second and Mark Hanna third.
Percy won the opening 125cc race, with Dunlop taking second and Paul Robinson third, while Ryan Farquhar secured victory in the Supertwins.
Saturday's action saw Donald win the second ISB race, with Robb and Johnston completing the podium.
Percy won the first 250cc joust. Lawlor and Nico Mawhinney completed the rostrum.
Lawlor turned the tables to beat Percy in the next race, with Richard Glasgow third.
Australian Donald was followed home by Mark Hanna and William Dunlop in Saturday's first Supersport race, while Haire and Hanna were second and third behind Donald in the next race.
The main Enkalon Trophy race was declared after 13 laps after the race was halted because of a crash involving Haire, who was unhurt.
Dylan and Derek Lynch claimed a double in the sidecar races.