Former Act deputy leader John Boscawen has taken over as Act Party president, replacing Chris Simmons.
Mr Simmons is understood to be preparing to stand for Parliament at the next election and has stepped down.
The formal handover will take place just before the party's annual meeting which will be held next month at the Kaukapapa farm of longtime Act supporter and funder Alan Gibbs.
Mr Boscawen retired from Parliament in 2011, the year Don Brash ousted Rodney Hide from the leadership.
After years of infighting and scandals, the party's ranks in Parliament have been depleted to just one MP - former National MP and former Auckland mayor John Banks, who holds the seat of Epsom under an electoral accommodation with National.