Charterhouse Capital, a private equity firm, agreed to acquire a majority stake in Amtivo, a provider of accredited certification to companies in 27 countries, from August Equity, a private equity firm. Financial terms were not disclosed. “Amtivo is one of the most exciting and distinctive businesses in the certification space, and benefits from an attractive market, highly effective operating model and an exceptional management team. We look forward to working with Mike and the team to support Amtivo’s continued growth during the next several years," James Cocker, Charterhouse Partner.