For most of the last few years, the private equity playbook in the middle market has been simple enough to fit on an index card. Buy a platform. Buy smaller companies that fit underneath it. Sell the combined entity for a higher multiple than any of the pieces would have fetched alone. It worked often enough that add-ons came to dominate deal activity, now accounting for close to 70 percent of transactions in the segment. The strategy earned its popularity honestly.
What it didn’t earn was permanence, and the data from this year is starting to say so directly. Advisors covering the space have begun describing the obvious part out loud: stacking acquisitions with a few synergies layered on top no longer commands the valuations it once did. That’s a meaningful statement, because it isn’t coming from skeptics of the strategy. It’s coming from the people who have spent the last several years recommending it.
The reason isn’t complicated once you sit with it. Multiple arbitrage works when a buyer can purchase something small at a low multiple and fold it into a platform that trades at a higher one, capturing the spread without doing much else. That spread was real for a while, particularly in fragmented industries where smaller players had no path to liquidity except selling to a consolidator. But spreads compress when enough capital chases the same trade. Every sponsor running the same playbook in the same sectors eventually competes the easy money away, and the lower middle market has had no shortage of sponsors running this exact playbook.
What’s left once the arbitrage narrows is the part of buy-and-build that was always harder and always mattered more: integration. Bringing an acquired company’s systems, reporting, and culture into a platform without breaking what made it valuable in the first place is a genuinely difficult operating problem, not a financial engineering exercise. It requires the platform’s management team to actually have the bandwidth and the skill to absorb new companies well, repeatedly, without the cracks showing up later in customer retention or employee turnover.
Firms that built their buy-and-build strategy around the financial trade are going to find this a hard pivot. Firms that were already doing the integration work properly, because they had no other choice given their size or their sector, are positioned to keep winning even as the easy spread disappears. The distinction has always existed. It’s just become more visible now that the tide that hid it is going out.
There’s a broader lesson in this for anyone evaluating a sponsor’s add-on strategy from the outside, whether as a co-investor, a lender, or a business owner deciding who to sell to. Ask less about how many add-ons a platform has completed and more about what happened to the companies after they were acquired. Retention of key employees. Whether customer relationships survived the transition. Whether the combined entity’s margins actually improved or just got reported that way. The math on the spreadsheet was never the hard part of buy-and-build. The execution after closing always was, and that’s the part the next few years are going to test.
