Cushman & Wakefield executives ring the opening bell of the New York Stock Exchange as the company’s shares began trading Thursday. Cushman & Wakefield began trading on the New York Stock Exchange in one of the most closely watched initial public offerings for a real estate services provider since rival CBRE Group's offering in 2004 and Jones Lang LaSalle had its IPO in 1997. The shares of Chicago-based Cushman & Wakefield traded at $17.70...