Николаевская железная дорога
After the death of his father, Stieglitz inherited the banking-house and succeeded as a banker of the Emperor. In 1840–1850 he successfully sold six 4% government loans to finance the construction of the Moscow – Saint Petersburg Railway and secured a significant foreign loan at the height of the Crimean War. Stieglitz also owned manufacturing enterprises in Narva and in Catherinehof.