The original post from Coupa itself:
https://investors.coupa.com/news-releases/news-release-details/coupa-software-enters-definitive-agreement-be-acquired-thoma

Two years ago, Coupa was acquiring LLamasoft, a supply chain design specialist
https://www.coupa.com/newsworthy/press-releases/coupa-acquires-ai-powered-supply-chain-design-and-planning-leader

Thoma Bravo has also acquired Anaplan, a software company with a focus on supply chain planning
https://www.thomabravo.com/press-releases/thoma-bravo-completes-acquisition-of-anaplan