A computer system has a processor; and a memory storage device in communication with the processor. The processor is configured, in a business cycle, to access fund expense calculation data and perform verification of the fund expense calculation data; receive data indicative of prices of the funds, perform verification with respect to the received price data; after completion of verification of the fund price data, receive data indicative of trades, perform verification on the received trade data; after completion of verification of the trade data, provide output signals indicative of instructions for execution of trades consistent with the verified price and trade data; based on the trade instructions data, determine instructions for payment in settlement of trades, provide output signals indicative of the instructions for payment; and update accounting ledgers with data from the business cycle.