CBIZ Small Business Employment Index drops slightly for May CBIZ Small Business Employment Index drops slightly for May Bloomberg A "Help Wanted" sign outside a restaurant in the East Flatbush neighborhood in the Brooklyn borough of New York. May was an off month for hiring by small companies, according to the latest CBIZ Small Business Employment Index. The index, which is compiled by Independence-based business services firm CBIZ Inc. (NYSE: CBZ), fell by a seasonally adjusted 0.21% last month after a nearly 3.6% increase in April, the company said in a news release on Friday, June 4. CBIZ's index tracks payroll and hiring trends for more than 3,500 companies nationwide that each have 300 or fewer employees.