U.K. startup Marshmallow has blown up over the years by using innovations in data science to build car insurance policies for immigrants and other consumers who have been overlooked or priced out of traditional insurance. Now, with a million drivers insured and a profitable annual revenue run rate of $500 million, Marshmallow has raised a fresh $90 million to expand.
Marshmallow plans to use the funding to move into financial services, as well as more insurance products that it hopes will appeal to a population of people that — despite the…