Computer technology for substantially optimizing portfolios of multiple
participants is disclosed. Preferably the portfolios of such multiple
participants comprise fixed income instruments. The disclosed systems and
methods include using at least one computer system for storing digital
data representing portfolio holdings of multiple parties and, in
particular, for each participant storing in the computer memory data
representing constraints with respect to the desired portfolio. The
method and system comprise optimizing using an optimization engine
portfolio and constraint information of multiple participants so as to
generate a set of trades that would substantially optimize participants
portfolios with respect to a known objective.