Exhibit 99.3 PURCHASE AGREEMENT THIS PURCHASE AGREEMENT (the "AGREEMENT") is entered into as of the 30th day of December, 2004, by and among NYFIX, INC., a Delaware corporation (the "COMPANY"), and WHITEBOX CONVERTIBLE ARBITRAGE PARTNERS L.P., a...Purchase Agreement • January 5th, 2005 • Nyfix Inc • Services-computer integrated systems design • New York
