Abstract: An index rebalancing computer system is provided that automatically rebalances an index and the component weights of one or more securities in the index. The system tracks and stores a value that represents an amount of cash generated by securities in the index over a predetermined time period. The index is rebalanced by at least adjusting a weight or a value of a second security included in the group of securities based on the value that indicates the amount of cash generated by securities in the index. An updated index value is calculated for the index based on the group of securities that includes the second security with the adjusted weight. Index component data is transmitted to subscribing entities.