Abstract: At least one exemplary aspect comprises a method comprising: (a) receiving electronic data describing a trading order for a market-traded security; (b) checking the data describing the trading order against one or more sets of conditions, and identifying one or more of the one or more sets of conditions that is satisfied; (c) based on the identified one or more of the one or more sets of conditions that is satisfied, identifying a class of trading algorithms appropriate for execution of the trading order; (d) selecting with a processing system one or more trading algorithms from the identified class of trading algorithms, for execution of the trading order; and (e) commencing with the processing system execution of the trading order via the selected one or more trading algorithms; wherein the processing system comprises one or more processors. Other aspects and embodiments comprise related computer systems and software.

Abstract: At least one exemplary aspect comprises a method comprising: (a) receiving electronic data describing a trading order; (b) receiving data describing a selection of one or more first trading algorithms from available stored algorithms for execution of the trading order; (c) commencing execution of the trading order via the one or more first trading algorithms; (d) evaluating quality of execution, during the execution, of the trading order via the one or more first trading algorithms; (e) comparing the evaluated quality of execution to a prediction of future performance of execution of the trading order by the one or more first trading algorithms; and (f) if the evaluated quality of execution compares unfavorably to the prediction of future performance, switching the execution of the trading order to one or more second trading algorithms. Other exemplary aspects comprise related computer systems and software.

Abstract: One exemplary aspect comprises a method comprising: (a) receiving data describing an executed trading order in a market traded security and related trade execution data; (b) calculating components of execution costs associated with execution of the order; and (c) transmitting data sufficient to describe the components of execution costs. Other aspects comprise calculations of (1) cost effect of trade decision factors associated with execution of an order; (2) a decomposition of execution of an executed limit order into components related to algorithm performance and components related to trader-input parameters of the order; (3) components of implementation shortfall associated with execution of an order; (4) components of profit/loss associated with execution of an order; and (5) components of execution outcome associated with execution of an order.

Abstract: At least one other exemplary aspect comprises a method comprising: (a) receiving electronic data describing a trading order; (b) receiving data describing a selection of one or more first trading algorithms from available stored algorithms for execution of the trading order; (c) commencing execution of the trading order via the one or more first trading algorithms; (d) evaluating, during the execution, execution performance of the trading order via the first trading algorithms; (e) comparing the evaluated execution performance to one or more pre-defined conditions; and (f) if the evaluated execution performance fails to satisfy the pre-defined conditions, switching execution of the trading order to one or more second trading algorithms. In an exemplary embodiment, data describing at least one of the pre-defined conditions is received in connection with the electronic data describing a trading order. Related systems and software are comprised in other aspects.

Abstract: One exemplary aspect comprises: (a) receiving data describing an executed trading order in a market traded security and related trade execution data; (b) estimating a price of the market traded security if the executed trading order had not been executed, based in part on the data describing the executed trading order; and (c) transmitting the impact-free price estimate. At least one other aspect comprises: (a) receiving data describing a potential trading order and related market data; (b) calculating an impact-free price estimate which estimates an execution price of the potential trading order if the potential trading order were to be executed without market impact, wherein the impact-free price estimate is based in part on the data describing the potential trading order; and (c) transmitting data sufficient to describe the impact-free price estimate.

Abstract: At least one exemplary aspect comprises a method comprising: (a) receiving electronic data describing a trading order for a market-traded security; (b) checking the data describing the trading order against one or more sets of conditions, and identifying one or more of the one or more sets of conditions that is satisfied; (c) based on the identified one or more of the one or more sets of conditions that is satisfied, identifying a class of trading algorithms appropriate for execution of the trading order; (d) selecting with a processing system one or more trading algorithms from the identified class of trading algorithms, for execution of the trading order; and (e) commencing with the processing system execution of the trading order via the selected one or more trading algorithms; wherein the processing system comprises one or more processors. Other aspects and embodiments comprise related computer systems and software.