Siprax acquired a majority 51% share in the glass technology supplier, which is based in Champagne au Mont D’or, near Lyon, France.
The investment company said it wanted the hollow glass industry supplier to extend its range of products and to widen its markets geographically.
Rondot designs, manufactures and markets mechanical parts and electronic equipment for glassmaking production lines.
It acquired the Noxaxion group based in Paluds de Noves, France, in July 2019.
Louis Rondot will reprise his duties as president of the Rondot group.
The organisation was formed by his grandfather in 1936. It has a €40 million turnover and has 180 employees. Approximatley 90% of its output is exported.