Private equity has spent years perfecting the buy and build model. Acquire a strong platform, bolt on smaller businesses, capture synergies, build scale and eventually sell a larger, more valuable company.
The model still works. But the constraint may be moving somewhere sponsors have historically paid less attention to.
PE150’s latest survey asked 85 market participants what is currently preventing their firms from executing more add on acquisitions. Across every professional group surveyed, the most common answer was not financing costs or target valuations.
It was integration capacity.
Among Commercial and Corporate Leadership respondents, 50% identified integration capacity as the biggest constraint. Investment and Finance professionals reported the same 50% figure. For Operations, Risk, Legal and Technology respondents, the share climbed to 56%.
Financing costs were a distant second, ranging from 25% to 33% depending on respondent group. Target valuations ranked last, cited by only 11% to 25%.
That matters because the conventional explanation for slower acquisition activity has focused heavily on the cost of capital and the gap between buyer and seller expectations. Those forces have not disappeared. But the survey suggests another constraint is developing inside portfolio companies themselves.
Sponsors may have the capital to complete the next acquisition. The question is whether the business has the capacity to absorb it.
That distinction becomes increasingly important in a market where add ons remain central to the private equity playbook. PitchBook reported that add ons represented 75.9% of US buyout activity in Q2 2025. The attraction is straightforward. Buying smaller companies can expand geography, add products, consolidate fragmented markets and create opportunities for revenue and cost synergies.
But closing the acquisition only creates the opportunity. Integration determines whether that opportunity becomes EBITDA.
Each acquisition brings another management team, technology stack, customer base, compensation structure and operating culture into the platform. The first acquisition may be manageable with the existing team. The fifth or sixth can expose weaknesses that were invisible when the consolidation strategy began.
That is where the economics of buy and build become more complicated.
McKinsey has argued that successful private equity integrations require clear ownership between sponsors and portfolio management, rapid decision making and dedicated integration capabilities. The challenge is that executives who are highly capable at running a business are not automatically experienced at integrating one.
For sponsors, that creates a different underwriting question.
Instead of asking only whether a target is attractive at a particular multiple, investment committees may increasingly need to ask whether the platform is operationally ready for another transaction. How quickly can systems be consolidated? Which executives own the integration? Can the sales organizations actually cross sell? How much management attention will the process consume? And what happens to the core business while everyone is focused on the acquisition?
Those questions become more important when returns cannot rely as heavily on favorable multiple movement. McKinsey reported that average private equity holding periods reached 6.2 years in 2025, while average EV to EBITDA multiples declined to 15.2 times, from 17.8 times in 2022. Longer holds and less generous valuations put more pressure on operational value creation to carry the investment thesis.
The result could be a subtle change in what separates successful consolidators from everyone else.
Capital remains necessary. Sourcing remains important. Price still matters. But sponsors that develop repeatable integration processes, dedicated operating resources and management teams capable of absorbing acquisitions quickly may have an increasingly valuable advantage.
The next phase of buy and build may therefore be less about who can buy the most companies and more about who can integrate them without breaking the platform.
PE has spent decades industrializing dealmaking.
Now it may need to industrialize what happens after the deal closes.
