Bloomberg became a general partner at Salomon Brothers, where he headed equity trading and, later, systems development.
The next largest group came from equity trading, where 21 were dismissed, the spokesman said.
Archipelago has been a rare success story in electronic equity trading.
The biggest dispute in this area seems to have been over global bond and equity trading.
A major factor behind the earnings recovery was the boost to commissions which accompanied a rebound in equity trading.
He has been director of equity trading since 1984.
His father is a limited partner and former head of equity trading at Goldman, Sachs.
In finance, equity trading is the buying and selling of company stock shares.
The acquisition included operations in private banking, wealth management and institutional equity trading.
The lackluster equity trading was "partially offset" by improved foreign exchange activity in late July, she added.
