Icon plc is buying Aptiv Solutions for $143.5 million.

Aptiv, headquartered in Reston, Va., designs clinical trials for the pharmaceutical and biotechnology industries. The company is backed by private equity firm the Halifax Group, venture capital firm SV Life Sciences and PE firm Comvest Partners.  

The Dublin-based buyer provides outsourced services to the pharmaceutical, biotechnology and medical device companies, including management, analysis and clinical studies. Icon plans to integrate Niphix, an oncology-focused service that Aptiv provides, into the company's Tokyo and Osaka operations.

The Halifax Group, headquartered in Washington, D.C., focuses on investing in lower middle market business. The firm created Aptiv in 2011 by combining six pharmaceutical companies. Halifax's recent transactions include portfolio company Envision Pharma Group's purchase of medical writing company ProScribein February, and  sale of PJ United, which owns Papa John's pizza restaurants, in January.