Private equity is building a new Big Four. The test is who stays.
The Grant Thornton and CBIZ deal shows private capital can assemble professional services scale faster than any partnership. The proof point will not be the AI investment. It will be whether the senior people stay through the integration.

The $5 billion CBIZ acquisition, and what New Mountain Capital is building around Grant Thornton, is worth reading closely: nearly 20 firms and 25,000 professionals added in 18 months, a $1 billion AI commitment and a platform heading towards $7.5 billion of revenue. The argument is that private equity has found a faster route to scale than the partnership model, which compounds people and reputation over decades.
The mechanics are right. The conclusion is slightly early. None of this works if the partners whose relationships were acquired walk out before the platform is built. That is the part of the thesis that needs modelling properly, and it is a retention question before it is a technology question.
The section on talent is the one to read twice. A partner comparing annual distributions against equity in a business built to be sold is a different conversation to the one most firms are set up to have. That conversation is coming to Australia. Some partnerships are ready for it. Not all.
For BD and marketing leaders, a platform built by private capital is a different employer from a partnership. The growth plan is written down, the targets are explicit and the function is expected to deliver them with the same discipline as any other part of the business. That suits some people very well. It also means the days of BD as a cost centre that supports partners are over the moment the deal closes.
The firms most likely to be approached in Australia are the ones in the mid market with strong brands, ageing partnerships and no obvious succession. If you lead BD in one of them, it is worth knowing what an investor would want to see from your function before the conversation starts, because it will start whether you are ready or not.




























