Jonathan Ritz, the former Chief Executive Officer of Validus' U.S. insurance operations, is teaming up with TowerBrook Capital Partners L.P. to mount a bid for ProSight Global, Inc. (NYSE:PROS), according to Insurance Insider's Adam McNestrie, citing sources. Ritz and Towerbrook are in takeover talks with ProSight, which is listed on the NYSE but still 75% owned by its private equity founders Goldman Sachs and TPG, the report stated, adding that the details of the bid are not currently known.