POSITION KEEPING

Bloomberg Tradebook has beefed up their sales team with the following new hires: Byron Cartozian has moved over from Credit Suisse First Boston, where he had national sales and service responsibilities on the Institutional Equity Services Desk for the last nine years. Mary Ann Doyle has come from Daruma Asset Management where she was an equity trader, and Leslie Ambinder comes to Tradebook from Pimco Funds, and before that Generic Trading where she was a trader and Instinet, where she was an