Dale Underwriting, Agora, Apollo, Probitas and Verto all have capital in place for 2020, or are nearing that point.
The business was established as a JV by Willis and Pembroke in 2012 after change in Lloyd’s rules.
International CEO Vandendael predicts staff numbers in London and Dublin will rise by about a quarter in 2020.
One of the best indicators of risk is how much growth was written in problematic lines during the soft market years.
The Corporation said it would lobby regulators and tax authorities to deliver an effective structure.