Corporate capital threatens the existence of Lloyd's, the editor of Chatset has warned.
Charles Sturge, who publishes league tables of syndicates operating in the 300-year-old market, said: "We express concern that corporate capital has not brought the required expertise of underwriting and management to the market."
"The existence of corporate capital, far from saving Lloyd's, threatens its very future."
Sturge's opinions follow speculation that Lloyd's may be reconsidering whether private investors, called Names, should be allowed to continue to operate in the market.
It is thought a study by Bain & Co into the future of the insurance market will make recommendations to the Council of Lloyd's today saying unlimited liability should end.
Names currently provide around £3bn of the market's £12.3bn capacity.