Inner Tracking Performance in ATLAS - Vertex and Mass resolution.

The ATLAS Inner Detector track reconstruction showed an excellent performance during Run 1 of the LHC from 2009 to 2013, while the increasing number of instantaneous proton-proton collisions created a more and more challenging environment during this period. In particular, the reconstruction of primary and secondary vertices has proven to cope very well in this environment and has been an integral part of many physics analyses performed with ATLAS data. We present an overview on the general track reconstruction performance with a dedicated focus on vertex and resonance reconstruction. Latter has been used in many physics analyses, and was also an important constraint for detector alignment and to establish momentum scale and material budget systematics of the inner tracking system.