The infrastructure, recycling and food group, One51, begun trading on the grey market today.
The shares are trading at €6 each, up 20% from the €5 level placed with investors.
One51, which is headed by Philip Lynch, has significant stakes in both NTR and Irish Ferries owner ICG.
One51 emerged from the IAWS Co-op and has been involved in a consortium looking to buy ICG.
