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We report on WIMP search results of the XENON100 experiment, combining threeruns summing up to 477 live days from January 2010 to January 2014. Data fromthe first two runs were already published. A blind analysis was applied to thelast run recorded between April 2013 and January 2014 prior to combining theresults. The ultra-low electromagnetic background of the experiment, ~$5 \times10^{-3}$ events/(keV$_{\mathrm{ee}}\times$kg$\times$day) before electronicrecoil rejection, together with the increased exposure of 48 kg $\times$ yrimproves the sensitivity. A profile likelihood analysis using an energy rangeof (6.6 - 43.3) keV$_{\mathrm{nr}}$ sets a limit on the elastic,spin-independent WIMP-nucleon scattering cross section for WIMP masses above 8GeV/$c^2$, with a minimum of 1.1 $\times 10^{-45}$ cm$^2$ at 50 GeV/$c^2$ and90% confidence level. We also report updated constraints on the elastic,spin-dependent WIMP-nucleon cross sections obtained with the same data. We setupper limits on the WIMP-neutron (proton) cross section with a minimum of 2.0$\times 10^{-40}$ cm$^2$ (52$\times 10^{-40}$ cm$^2$) at a WIMP mass of 50GeV/$c^2$, at 90% confidence level.

XENON100 Dark Matter Results from a Combination of 477 Live Days