In March 1989 Calmos acquired UltraMac Conversions which designed and manufactured peripherals for Apple's Macintosh computers, which subsequently operated under the name Calmos Data, the group was headed by the former president Lincoln Henthorn. By May Calmos Microsystems had grown to 55 employees, was profitable and had sales of over $4.5 million. Newbridge Networks, a Calmos customer and founded by Welsh entrepreneur Terry Matthews, who had also attended university with founder John Roberts, acquired the company. Newbridge was private at the time and subsequently went public that June, financial terms were not disclosed at the time. However, in a 1997 Ottawa Citizen interview John Roberts stated that Calmos was purchased for $5 million in Newbridge Pre-IPO shares that subsequently became worth "about $100 Million."