 They increased their share by 0.9%, making it the only party to increase its vote share, and gaining 15 seats as a result.At the 2015 general election, the UUP returned to Westminster, gaining the South Antrim seat from the DUP and Fermanagh & South Tyrone (where they had an electoral pact with the DUP not standing) from Sinn Féin.In the 2016 European Union referendum the UUP supported the remain campaign, the UUP Executive passing a motion on 5 March 2016 that the party "believes that on balance Northern Ireland is better remaining in the European Union, with the UK Government pressing for further reform and a return to the founding principle of free trade, not greater political union.