	leader ldco buys petrosurance stake leader development corp said it has purchased shares of convertible preferred stock in petrosurance inc for dlrs in cash and real estate petrosurance specializes in property and casualty insurance for the oil industry leader said the stock is convertible into a petrosurance common leader said it already owns pct of petrorusrance and conversion would give it about pct the company said petrosurance will use the sale proceeds to support growth and improve the structure of its reinsurance treaties to retain a larger part of premiums written reuter 
