Vista Equity Partners first piped up on 20 February and two weeks ago unveiled a £1.27bn cash offer for Misys.
Officed in San Francisco, Chicago and Austin, the company invests in software and technology enabled businesses, “with a focus on long-term value creation”.
It counts among its portfolio Turaz, the trade and risk management software company it bought from Thomson Reuters in January.
Vista has said it is looking to combine Misys with Turaz, creating what Vista chairman and chief executive Robert F Smith said would be a “global leader in core banking, treasury management, capital markets and enterprise risk management software.”
Vista has over $6bn under management, and it has so far completed 68 software-related transactions, worth almost $15bn.
The private equity company said it would fund the acquisition through a mixture of equity financing from its own cash stash and debt funding from external providers.
The Turaz-Misys combo would be headquartered in London.