The coronavirus pandemic pushed Lloyd's of London to a 900 million pound ($1.24 billion) pre-tax loss in 2020, compared with a 2.5 billion pound profit in 2019, the commercial insurance market said on Wednesday.
The 330-year old market, home to around 100 syndicate members, expects to pay out 3.4 billion pounds in 2020 COVID-19 claims net of reinsurance, it said in a statement.
Lloyd's CEO John Neal said 2020 had been "an extremely challenging year marked by a global health crisis of a scale never seen before".
"The year was also marked by a high frequency of natural catastrophe claims and the UK's formal exit from the EU, driving further losses and uncertainty," he added.
Gross written premiums declined by 1.2% to 35.5 billion pounds in the specialist insurance market - which covers everything from oil rigs to footballers' legs - after Lloyd's scaled back some loss-making business lines last year.
But Lloyd's said premium rates had risen 10.8% last year and rate rises had continued into 2021. Insurers typically increase rates after experiencing large losses.