Twenty-five possible isomers of dithiol derivate Ti@C70(SH)2 with sulfur atoms attached to the α carbons of the cage were optimized and the transmission properties of the two lowest energy isomers were computed; see Table for the relative energies of the isomers. The conductivity of Ti@C70S2, in which the hydrogens of the thiol groups are removed to connect the sulfur covalently to the gold electrodes was evaluated. The calculated transmission through Ti@C70S2 is about a half of that of the unsubstituted Ti@C70, Fig. . However, the I/V curves of both the spin-up and the spin-down currents show remarkably new features. First, for low voltages, where |VSD| < 0.5 V, the positive voltage leads to a larger conductivity than the negative voltage. The maximum RR of 2.42, 2.04, and 2.15 is observed at VSD = ±0.3 V for the spin-up, spin-down, and total currents, respectively. At higher voltages, |VSD| > 0.5 V the negative voltage region shows a more pronounced conductivity with rectification ratios of 9.32 S-functionalization does not change the spin-filtering performance of the Ti@C70 system, Fig. . Finally, the spin-and orbital-resolved partial density of states suggest that in the Ti@C70S2 system the spin conductivity is the result of the contribution of the d-orbitals of the titanium atom, Fig. , akin to the parent compound. Conclusions and Prospects: Looking for the spinristors on a macroscopic scale.