Ryan Sheftel, the global head of fixed-income electronic trading atCredit Suisse Group AG, left the firm earlier this month to take up a new post at Global Trading Systems LLC, said people familiar with the matter.

Global Trading Systems is a large computer-driven trading company that uses proprietary algorithms to trade in a range of stocks, commodities, currencies and derivatives around the world.

The New York firm is hiring Mr. Sheftel as its global head of fixed income to broaden its trading presence in Treasury bonds and interest-rate derivatives, said people familiar with the discussions.

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