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We simulate the evolution of halo wide binaries in the presence of MAssiveCompact Halo Objects (MACHOs) and compare our results to the sample of widebinaries of Chaname & Gould (2003). The observed distribution is well fit by asingle power law for angular separation, 3.5" < theta < 900", whereas thesimulated distributions show a break in the power law whose location depends onthe MACHO mass and density. This allows us to place upper limits on MACHOdensity as a function of their assumed mass. At the 95% confidence level, weexclude MACHOs with mass M > 43Msun at the standard local halo density rho_H.This all but removes the last permitted window for a full MACHO halo for massesM > 10^{-7.5}Msun.Comment: accepted for publication in the Astrophysical Journal, 8 pages, 7  figure

The End of the MACHO Era: Limits on Halo Dark Matter from Stellar Halo Wide Binaries