Major phosphatase responsible for tyrosine dephosphorylation of MAP kinases FUS3 and HOG1 to inactivate their activity; it also has important roles, along with MSG5, in the inactivation of FUS3 following pheromone stimulation. H2O + O-phospho-L-tyrosyl-[protein] = L-tyrosyl-[protein] + phosphate Interacts with HOG1. Present with 768 molecules/cell in log phase SD medium. Belongs to the protein-tyrosine phosphatase family. Non-receptor class subfamily.