That leaves only the Soul Stone that hasn’t been officially introduced outside of Collector’s history lesson in Guardians of the Galaxy.
Right now, five Infinity Stones are accounted for in the MCU.
While some speculated that we might finally see the Soul Stone during Black Panther, that didn’t end up happening, though there’s still a chance it is indeed resting in Wakanda judging by how the African nation will be an important battleground in Avengers: Infinity War.
The Power Stone is still locked safely away in the Nova Corps vault, Loki retrieved the Space Stone before Asgard was destroyed in Thor: Ragnarok, the Mind Stone is still powering The Vision, the Time Stone is resting in Kamar-Taj as the Eye of Agamotto, and as far as we know, The Collector still possesses the Reality Stone.