Gov. Martin O?Malley said Friday he wants to close “corporate loopholes” that allow companies to avoid paying taxes, including one that lets corporations buy and sell real estate without paying state and local transfer taxes.

“Everyone wants to know that everyone is paying their fair share,” O?Malley said. He backs “combined reporting” for corporations and taxing property deals made through sale of “controlling interest” of a company that owns real estate. Liberal and progressive groups have advocated both moves.