A computer-based method for associating ownership of anonymous payment cards uses a computer device including a processor in communication with a transaction database. The method includes identifying a target account number for a payment card from the transaction database, identifying a set of transaction times associated with the target account number from the transaction database, and comparing the target account number to each candidate account number of a set of candidate account numbers from the transaction database. Comparing the target account number includes identifying a first candidate set of transaction times associated with a first candidate account number of the set of candidate account numbers, comparing the target set of transaction times to the first candidate set of transaction times, and identifying the first candidate account number as a match candidate if the target set of transaction times and first candidate set of transaction times do not include overlapping transactions.