Onex, a private equity fund focused on mid- to large-cap opportunities, agreed to acquire Fidelity Building Services Group, a full-service mechanical engineering, contracting, and service company. Financial terms were not disclosed. “Fidelity BSG has a strong reputation for providing its customers with high-quality service supported by differentiated technical expertise. The company is well-positioned to benefit from an increasing focus on improving energy efficiency, indoor air quality and occupant comfort in buildings. We’re delighted to be partnering with the Fidelity BSG team to support its continued organic growth and help accelerate its successful acquisition strategy," Matt Ross, Onex Managing Director.