United Wholesale Mortgage was the top contributor to prime non-agency mortgage-backed securities in 2019, according to a new ranking and analysis by Inside Nonconforming Markets. The privately held nonbank contributed $3.61 billion of loans to prime non-agency MBS last year, accounting for 23.8% of the dollar volume of deals in 2019. UWM, a subsidiary of United Shore Financial, more than tripled its contributions on an annual basis.

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