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Last year, Therium Capital Management, another London-based funder, secured £200 million ($303.5 million) in financing from a single company, believed to be the largest-ever single investment of this type. Therium didn’t disclose the identity of its backer, but several people familiar with the matter say it’s AmTrust Financial Services, a New York insurer with $21 billion in assets. (An AmTrust spokeswoman declined to comment.) Therium plans to raise more money, the people say.

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