The 2021 Insurance DataLab Underwriting Performance Report ranks the 25 largest insurers in UKGI on their underwriting performance, taking in three key metrics that cover both short and longer-term performance. This abridged report also includes a market summary of the performance of key business lines over the last three years, while the full report delves deeper into the specific strengths and weaknesses of each provider in individual company profiles and a detailed analysis of company performance by business line.