tradebook

The company was recently joined by Changpeng Zhao, a former head of Tradebook Futures Development at Bloomburg.

People close to the company said Tuesday that the same data had been accessible to employees in its trading division, known as Bloomberg Tradebook, but that the company had cut off that access recently.

Mr. Tierney has helped Tradebook win a greater market share in stocks and options and has developed new products.

Beyond Tradebook, Bloomberg’s clients use the company’s software to look for and execute trades in many different markets, putting the company at the center of the information flow between buyers and sellers.

The most obvious business line that competes with Wall Street is Tradebook, a subsidiary of Bloomberg that is registered to trade on behalf of clients, collecting valuable commissions for each trade.