Global Custodian writes about the plans, said to aim at stronger front-to-back office capabilities.
Rockall is the provider of a technology platform called Collate, currently in use by ten of the top 30 US banks to make collateral management and credit risk processes more efficient.
Price not revealed
Rockall also hosts a cloud-based securities lending solution known as Fastnet, which automates management of securities-based lending.
Terms of the planned acquisition deal have not been disclosed.