MANAGEMENT, FINANCIAL AND INVESTMENT SERVICES, NAMELY, PROVIDING PRICING, MARKET AND TRADING INFORMATION FOR SECURITIES, DERIVATIVES OR SIMILAR INSTRUMENTS BY ELECTRONIC MEANS VIA VOICE BROKERS, DOMESTIC AND GLOBAL COMPUTER NETWORK FOR USE BY FINANCIAL INSTITUTIONS, PROFESSIONALS, AND TRADERS; EXECUTION OF TRANSACTIONS INVOLVING SECURITIES BY ELECTRONIC MEANS VIA GLOBAL COMPUTER NETWORK FOR USE BY FINANCIAL INSTITUTIONS, PROFESSIONALS, AND TRADERS