The language might have changed at Lloyd’s of London, but the fights haven’t. In 1810, parliament heard warnings that a new entrant to the insurance industry could become a “leviathan” that would “swallow up all the small fry”. In 2026, as a new monster muscles into the market, one senior broker was more blunt: “why the eff is Lloyd’s doing this?”

This time, the leviathan is Blackstone. It wants to create a new vehicle at Lloyd’s to soak up reinsurance business provided by Aon, the world’s largest reinsurance broker. In the 19th century, underwriters were spared the increase in competition, at least temporarily; legislation kept incomers out, for a while. Today’s syndicates, as Lloyd’s pools of insurance capital are known, probably won’t be so lucky.

Traditionally, customers discuss their insurance or reinsurance needs with one of about 400 brokers in the Lloyd’s marketplace, who then find the underwriters that will provide the best terms. The policies are funded with capital from large insurance groups or, increasingly, institutions such as Blackstone. They hope to profit by taking in more insurance premiums than they pay out, and amplify the returns by investing those premiums into other assets.

Blackstone’s plan wouldn’t totally transform that model, but it would speed things up and spread risk between a smaller number of large syndicates. Lloyd’s has been keen to encourage the trend in principle, reasoning that it should increase efficiency and ultimately drive down costs for customers. Any broker or insurer — in fact, any business of any kind — would understandably grumble upon seeing Blackstone land on their doorstep as a competitor. Some are focusing on the idea that private equity might introduce new levels of risk into the market, or might be unprepared for the kind of losses that occur in bad times. However, it’s possible to overstate this. Lloyd’s rules would not allow Blackstone to stick all its insurance premiums into high-risk private credit investments, for example. More importantly, keeping private capital out of London’s historic insurance marketplace wouldn’t curtail its spread through insurance more broadly. Blackstone, along with rivals such as Brookfield, has huge amounts of money to deploy, and insurance offers attractive returns uncorrelated with broader financial markets. Should Blackstone find itself unwelcome inside the famous inside-out Lloyd’s Building, the chances are it would spend that money in another insurance centre such as Bermuda. That is hardly good for London in the long term. Lloyd’s is one of several London markets undergoing significant change. In that, it joins banking, where some large lenders are threatening to rethink their investments, and a stock exchange struggling to attract and keep hold of listings. Unlike banking and stock trading, though, insurance is one area where major international investors still think London is a world leader. The time to worry is when big companies are leaving, not when they ask to join.