Certify, a travel and expense management company, has acquired Abacus, an expense reporting solution. Certify was purchased last year by K1 Investment Management and merged with Nexonia, ExpenseWatch and Tallie. Adding Abacus to its product portfolio allows Certify, according to the company, to accelerate its growth and serve a more diverse range of clients. It already supports more than 10,000 customers in North America. Robert Neveu, CEO of Certify, said the acquisition “strengthens and expands our management team, product set and domain knowledge.” He said Abacus’s real-time expense management solution is unlike anything else in the marketplace. Hasan Askari, managing partner of K1, said the deal expands Certify’s position as the largest independent provider of travel and expense management software.