By Jacob Bunge 
 

Shane Swanson, an executive who helped build Citigroup Inc.'s (C) equity-trading business before starting a high-frequency trading firm, has rejoined the bank.

Mr. Swanson returned to Citigroup April 29 as president of its Automated Trading Desk unit, which trades shares with online brokerages, according to an internal bank memo reviewed by Dow Jones.

Mr. Swanson, along with his brother Steve and Peter Kent, previously headed up the ATD unit that was purchased by Citigroup in 2007 for $680 million, becoming a foundation for the bank's broader push into electronic trading.

The trio departed the bank in 2010 to launch Eladian Partners LLC, among a wave of automated trading houses run by former exchange bosses and floor traders. Eladian closed last October, seen as a casualty of a slump in stock and derivatives trading activity on U.S. exchanges that has dragged on for several years.

Before leaving Citigroup, Mr. Swanson had been director of compliance and general counsel for the ATD unit. Rejoining as president, he will continue to work with regulators and customers of the division, according to the Citigroup memo.

"Shane will be very involved in the day to day operations of the firm," wrote Jeff Martin, chief executive of the ATD unit, in the memo.

A Citigroup spokesman confirmed the bank's hiring of Mr. Swanson. Mr. Swanson did not immediately respond to a request for comment.

Citigroup's ATD is the fourth-largest U.S. firm trading stocks directly with discount brokerages, taking the other side of trades placed by individual investors. The firm represented 14% of such trading in April, according to data compiled by Raymond James Financial, and ATD estimates that it regularly trades 200 million shares per day.

Citigroup competes for the business against Knight Capital Group Inc. (KCG), the largest such market-making firm, as well as units of Citadel LLC and UBS AG (UBS).

Earlier this year Citigroup promoted Dan Keegan, another former ATD official, to head all equities-related businesses for the bank in the Americas.

Write to Jacob Bunge at jacob.bunge@dowjones.com

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