X0101 EFFECT 33 LIVE 2018-08-01 0001379491-18-003935 485APOS 0000035315 FIDELITY SALEM STREET TRUST 002-41839 S000056356 Fidelity ZERO Total Market Index Fund C000177583 Fidelity ZERO Total Market Index Fund S000056357 Fidelity ZERO International Index Fund C000177584 Fidelity ZERO International Index Fund