First Reserve, a global private equity investment firm, completed the acquisition of AP4 Group, a global full-service provider of critical power plant and turbomachinery maintenance services. Financial terms were not disclosed. "This is an exciting milestone and testament to the momentum of our business and the industry today. As we continue to thoughtfully grow our platform to enhance our global reach and fully integrated service offerings, First Reserve’s deep network, partnership-oriented approach and industrial equipment and utility services track record in driving long-term growth make them the right partner for AP4’s next chapter. We are grateful for Cloud Investment Partners’ support over the past several years and for their strong belief in the management team’s vision for the company," Greg Young, AP4 CEO.