One Equity Partners, a middle market private equity firm, completed the acquisition of Clayens, a value-added outsourced contract manufacturer of high-performance polymers, from Siparex, a French private equity firm. Financial terms were not disclosed. "Clayens’ specialized expertise in producing highly engineered products that meet the most rigorous specifications is highly valued by multinationals operating in various end markets. This capability has produced a loyal customer base that gives the Company a significant advantage in a competitive market. OEP has a strong track record of building leading global companies from local champions through cross-Atlantic business combinations, and we believe that in partnership with Siparex and other current shareholders OEP can apply this experience to help Clayens transition from a leading French business to a major global player," Konstantin Ryzhkov, One Equity Partners Managing Director.