Trivantus, Inc. is an independent regional payroll processing, HR, and employee benefits company founded in 2003 in Manchester, New Hampshire, owned by the Gatsas family (Michael Gatsas also co-founded the PEO Staffing Network). Trivantus has been voted Best Payroll Service Company by New Hampshire Business Review for many consecutive years and has ranked on the Inc. 5000 list of America’s fastest-growing companies.