Mill Steel, a steel supplier, completed the acquisition of Cleveland Metal Exchange and Chicago Stainless Metal Exchange, two stainless steel and aluminum products providers. Financial terms were not disclosed. "We are thrilled to be entering the stainless and aluminum industry. This was an easy decision made by our customers and supports our plans for continued growth. I have the utmost respect for the CME team and confidence in our combined efforts to deliver a superior customer experience," Pam Heglund, Mill Steel CEO.