Wertheim & Co. was an investment firm founded in 1927 by Maurice Wertheim and , who met when they worked together at Hallgarten & Company. The firm engaged primarily in the merchant-banking business; it invested (in companies and real estate primarily for the benefit of its own partners and a small number of investment-advisory clients) from its formation until the deaths of Wertheim and one of his senior partners (Edwin Hilson) in 1950 and 1952 respectively.