Centricity Research continues to expand following its official formation at the beginning of the year, bringing a fourth clinical research company, Aventiv Research, into the fold.

Columbus, Ohio-based site network Aventiv Research will bring its Ohio and Arizona research sites and specialization in drug, device and diagnostic trials across all phases to the table. To date, the network has conducted more than 475 trials with more than 55 sponsors and delivered data supporting 26 FDA drug approvals, according to Centricity.

Centricity, which claims to be the biggest integrated research site organization across the U.S. and Canada, began as a team-up between Georgia’s IACT Health and Ontario’s LMC Manna Research in November 2021, followed by the merger with True North Clinical Research in December 2021.

This latest merger puts the massive North American site network at 45 sites, more than 1.6 million diverse patients and more than 150 investigators in 35+ therapeutic areas, Centricity said.