NEW YORK : Private equity firm BC Partners Ltd is considering selling a portion of Navex Global Inc in a deal that could value the U.S. risk management software provider at more than $3 billion, including debt, people familiar with the matter said. BC Partners aims to begin a sale process for a minority stake in Navex next year after it hired an investment bank, said the sources, who requested anonymity because the matter is confidential. Navex generated earnings before interest, taxes, depreciation and amortization of about $150 million last year, the sources said.