After Archibald's death his younger brother Adrian joined him and they called the company Thomas & Adriaan Hope.
Thomas became head of the VOC. In 1758 he bought Keizersgracht 444-446 from Mattheus Lestevenon, the ambassador to France. In 1759 Hope & Co. had 26 employees. The neighboring house, number 448 was bought in 1763 to house Henry Hope, and Thomas's son Jan, the new partners.
In 1779 meldden de Nederlandsche Jaarboeken naar aanleiding van het overlijden van Thomas '[...] dat er mogelijk geen comptoir zo magtig in Europa gevonden wordt, dan het welk hij in deze stad heeft gevestigd'