Vacuum residue-stabilized concentrated suspensions of nanosized metal sulfide particles are synthesized from inverted emulsions of aqueous solutions of \Mo, Ni, Fe, and W salts by heat treatment in the presence of a sulfiding agent and hydrogen. The synthesized catalysts are tested in the hydroconversion of heavy cracked cycle oil with a high content of aromatic hydrocarbons. Hydroconversion is carried out in an autoclave at 425 degrees C at a hydrogen pressure of 7 MPa and a catalyst content in the reaction zone of 0.1% per metal. Our studies suggest that \Mo- and Ni-containing catalysts show a higher activity in hydrogenation and hydrodesulfurization reactions. Catalytic activity, which is assessed from an increase in the ratio of paraffin-naphthene to aromatic hydrocarbons and the H/C ratio in hydrogenation product fractions, decreases in the sequence \MoS2, (\MoS2 + Ni7S6), Ni7S6, Fe1 -xS, and (NH4)(0.25)WO3.