During the 1880s, Mellon began to expand the bank's activities. Along with Frick, Mellon gained control of the Pittsburgh National Bank of Commerce, a national bank that was authorized to print banknotes. Mellon also acquired or helped found the Union Insurance Company, City Deposit Bank, the Fidelity Title and Trust Company, and the Union Trust Company. He branched out into industrial concerns, becoming a director of the Pittsburgh Petroleum Exchange and a co-founder of two natural gas companies that collectively controlled 35,000 acres of gas lands in the late 1880s. In 1890, Thomas Mellon transferred his properties to Andrew, who would manage the properties on behalf of himself, his parents, and his brothers. In late 1894, Thomas transferred all of his remaining assets to Andrew. Despite the large sums entrusted to Andrew, the businesses he ran were still fairly small in the 1890s; T. Mellon & Sons employed seven individuals in 1895.