The party is up to 29% in the Business Post survey.
Sinn Fein's risen in popularity in the latest Business Post opinion poll.
Mary Lou McDonald's part is up two to 29 per cent alongside Fine Gael which is down 1 to 29 per cent.
Fianna Fail's up 1 to 14 per cent, the Greens have risen by 1 to 5 per cent, with the Social Democrats unchanged on 5 per cent.
My analysis of the Red C poll here… SF’s message on housing is still hitting home with Generation Rent https://t.co/KLYt3a2dWt via @businessposthq
— Michael Brennan (@obraonain) May 30, 2021
Labour's down 2 to 3 per cent and the Independents have dropped 1 to 10 per cent.
The Red C Research was carried out from the 21st to the 26th of May in a sample of 1,034 people.
Business Post Political Editor Michael Brennan says it's a good result for Sinn Fein:
Michael Brennan thinks Fianna Fail will be pleased with their performance:

Minister Heydon Visits UK To Strengthen Irish Beef Trade
Back-To-School Costs, Including Paying For Digital Devices, Causing Major Concerns For Parents
July 2026 Recorded As Third Hottest Month On Record
Senator Seeks Mandatory Jail Terms For Tool Theft
More Than €1.5 million Spent Cleaning Up Illegal Dumping On The Curragh
150 jobs To Be Created At New €15m Applegreen Service Area In Naas
Demand for GPs Outstrips Growth In Kildare And Across Ireland
Gardaí Seize 38 E-Scooters And E-Bikes In Dublin Crackdown