GTS will become the largest Designated Market Maker on the New York Stock Exchange floor after agreeing to purchase Barclays Plc’s DMM trading business. The announcement means that high-speed trading firms now manage the buying and selling of nearly all securities there.

Financial terms of the deal, which is expected to close in the second quarter, weren’t disclosed. GTS will now oversee trading for more than 1,200 securities at the NYSE, including Exxon Mobil Corp., Berkshire Hathaway Inc., Alibaba Group Holding Ltd. and Twitter Inc.

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