GrassRoots Biotechnology, which has worked as a partner with Monsanto for several years, is now part of the agricultural giant.
Monsanto acquired the Durham-based company on June 14.
Financial terms were not disclosed.
Research-focused employees at GrassRoots are now working for Monsanto.
GrassRoots was spun out of Duke University in 2007. Founders included Philip Benfey and Doug Eisner.
The firm developed technology focused on gene expression and other research, It had worked with Monsanto on two projects.