Abstract: A transaction suspension system rapidly determines whether messages received by a data transaction processing system correspond to a stored message pattern. Stored message patterns may relate to a transaction type associated with each message, which sources transmitted the messages, and when messages were received by the data transaction processing system. The transaction suspension system may prevent the processing of messages, e.g., messages from a specific source, even if the messages would have otherwise qualified for processing or execution.

Abstract: A transaction suspension system rapidly determines whether messages received by a data transaction processing system correspond to a stored message pattern. Stored message patterns may relate to a transaction type associated with each message, which sources transmitted the messages, and when messages were received by the data transaction processing system. The transaction suspension system may prevent the processing of messages, e.g., messages from a specific source, even if the messages would have otherwise qualified for processing or execution.

Abstract: A transaction suspension system rapidly determines whether messages received by a centralized, anonymous data transaction processing system related to data objects correspond to a stored message pattern. Stored message patterns may include how the message impact objects within the data transaction processing system, which sources transmitted the messages, and when messages were received by the data transaction processing system. The transaction suspension system may prevent the further processing of messages, e.g., messages from a specific source, even if the message would have otherwise qualified for a completed, or processed, transaction.

Abstract: Protections against self-matching trade orders are disclosed which maximize liquidity/efficiency by reducing/minimizing unnecessary cancelations and/or resubmissions. Rather than automatically cancel or modify the incoming and/or self-matching counter orders, those resting counter orders, which would result in the occurrence of a self-match with an incoming order, are placed in a hold state or otherwise set aside such that the incoming order may be matched with other non-self-matching orders. The held orders are subsequently returned to the order book at the same, or different, priority to await a subsequent incoming order.