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Former Goldman Sachs Group managing director Duncan Niederauer has been hired as a co-COO of NYSE Group. Also, Gerald Putnam, currently president and co-COO, will become vice chairman of NYSE Group.

Michael Bodson has left Morgan Stanley, where he was global head of operations for the institutional, retail and asset management groups, to join Depository Trust & Clearing Corp. as executive managing director for business management and strategy.

Alternative trading system Aqua has hired Brian Gay, formerly of software vendor TransactTools, as SVP and global head of integration services.

Electronic marketplace and trading technology vendor eSpeed hired former Bloomberg exec Yevette Tierney as its CIO.