Shares of W.R. Berkley jumped to a record high on Friday after reporting that Tokyo-based Mitsui Sumitomo Insurance plans to buy a 15% stake in the company. W.R. Berkley on Friday confirmed that Mitsui Sumitomo would purchase 15% of the company’s common stock through open market purchases or private third-party transactions. The Berkley Family is reportedly not selling any of its…
