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Particle physicists at the Large Hadron Collider investigate the propertiesof matter at subatomic length scales by colliding together bunches ofhigh-energy protons and observing the decay products of the collisions. ATLASis one of two general-purpose detectors that reconstruct the interactions and,as part of a wide range of physics goals, measure the production of Higgsbosons and searches for exotic new phenomena including supersymmetry, extradimensions of spacetime, and dark matter. Selecting the interesting collisionevents using hardware- and software-based triggers is a major challenge thatwill become more difficult as the luminosity increases in future data. TheATLAS Fast TracKer (FTK) is a custom electronics system that performs fasthardware-based tracking of charged particles for use in trigger decisions. In2018, two FTK "Slices" covering portions of the ATLAS detector were installedand commissioned using proton-proton collisions, to prepare for physicsdata-taking in Run 3. The FTK track-finding and track-fitting strategies andthe tracking performance for the FTK Slices are presented. Strategies forcoping with changing beamspot and other conditions in future data arediscussed. A strategy for triggering on displaced tracks from long-livedparticles is also presented.

First tracking performance results from the ATLAS Fast TracKer