Tracking and Vertexing Results from First Collisions

CMS recorded the first LHC collisions at center of mass energies of 900 GeV and 2.36 TeV in December 2009. We reconstruct the trajectories of charged particles produced in the collisions using the all-silicon tracker and measure their momenta in the 3.8~T solenoidal magnetic field. We have assessed the performance of track reconstruction in the data and compared it to the expectation from simulation.