We expect U.S.-based human resources (HR) service provider TriNet HR Corp.'s credit metrics will continue to strengthen as it gains market share through new product launches and pricing strategies. We are revising our outlook on TriNet to positive from stable and affirming our 'B+' corporate credit rating on the company. In addition, we are assigning a 'B+' corporate credit rating to TriNet Group Inc., the parent in the group and guarantor of TriNet HR Corp.'s debt. We are also affirming the 'BB' issue-level rating on the company's first-lien credit facility. The '1' recovery rating remains unchanged. The positive outlook reflects our view that TriNet HR Corp will further reduce its leverage by growing EBITDA and maintaining stable debt-to-EBITDA levels well