The old PE playbook ran on leverage. Buy at 7x, load it with debt, cut costs, sell at 8x. The spread did most of the work.
That playbook is finished.
Bain's 2026 Global Private Equity Report lays it out: in the current environment, a deal needs 10–12% annual EBITDA growth to generate a 2.5x MOIC. In the 2010s, that same result required roughly 5% annual growth. Entry multiples have pushed north of 11.9x in North America. Debt costs 8–9%, not 4%. Leverage as a share of entry price has dropped from 44% to 37%. The math no longer rewards financial engineering. It rewards operators.
Which brings us to the PE operating partner — the most important role in private equity that nobody outside the industry fully understands.
What the role actually is
The operating partner is not a management consultant who drops in with a slide deck. Not a board seat filled by a retired executive collecting a check. The job is to build what the portfolio company doesn't have: systems, talent, process discipline, commercial infrastructure.
In lower-middle-market deals — $2M to $10M EBITDA — the target company almost always arrives without a CFO who can produce institutional-grade reporting, without a CRM that tracks deal flow or customer retention, without a defined sales process, without KPIs that tell you in real time where margin is leaking. The founder built a good business. The operating partner builds a scalable one.
That is a fundamentally different job than what operating partners do at mega-fund PE, where companies already have professional management, finance functions, and IT infrastructure. In the lower middle market, you're not optimizing — you're professionalizing. The gap between those two words determines your return.
The return attribution shift
PwC and Heidrick & Struggles surveyed 251 PE operating professionals. The finding that matters most: since 2010, 47% of value creation in private equity has come from operations — up from 18% in the 1980s. Financial engineering's contribution dropped from 51% to 25% over the same period.
This is not a trend. It is a structural shift. When capital is cheap and multiples expand, leverage amplifies returns. When capital is expensive and multiples compress, operations are the only lever you control.
Bain's [2025 exit data](https://www.bain.com/insights/topics/global-private-equity-report/) confirms it: 71% of value in PE exits came from revenue growth and EBITDA expansion. Multiple expansion and financial structuring accounted for the rest. That number will climb as rates stay elevated and the denominator problem persists for GPs sitting on 2021 vintage assets.
PwC framed it directly: *"Ten years ago, a sophisticated operating team with knowledge of how technology can transform a portco's operations was a niche capability. Now, it is table stakes."*
The LMM multiplication effect
Here is the math that makes lower-middle-market operating partners more valuable than their counterparts at any other fund size.
A $100M EBITDA business with a 20% margin is already running tight. Getting another 200 basis points of margin expansion requires sustained professional effort. A $10M EBITDA business with a 10% margin has a fundamentally different starting point. Research from CAIS on [lower-middle-market private equity](/blog/lower-middle-market-private-equity/) puts the structural margin expansion potential at 500–800 basis points for LMM targets — compared to 200–300 basis points at the large-cap level.
Why the gap? Because LMM companies have been running on founder instinct. No reporting cadence. No defined close process. No pricing discipline. No cross-sell framework. No vendor consolidation. These are not complex problems. They are unfixed problems. An operator who has built systems before can solve them in months.
Entry valuation amplifies this further. Lower-middle-market acquisitions happen at a structural multiple discount compared to large-cap deals on comparable EBITDA. Every point of EBITDA improvement creates the same dollar impact — but the LMM buyer paid less for the asset to begin with. That spread is where LMM operating partners operate. The mission is to compress the valuation gap through genuine operational improvement, not to wait for the market to re-rate an already expensive asset.
The leadership gap
AlixPartners surveys PE firm leaders and portfolio company executives annually. Their most recent PE Leadership Survey asked portco CEOs and CFOs what they find lacking in their PE investors. Thirty-one percent said it directly: the PE firm lacks operational expertise and business acumen.
That is a one-in-three failure rate on the most critical relationship in the deal structure.
The operating partner exists, in part, to close that gap. An effective one translates between the GP's return expectations and the portco management team's operational reality. Without that translation, you get pressure without direction — a formula for leadership turnover and value destruction.
AlixPartners found that nearly two in five operating partners plan to remove at least one portfolio company CEO within the next 12 months. Talent assessment is not a peripheral skill in this role. It is a core one. You walk into a company, assess the team the founder hired — some on competence, some on relationship — and you make the call. Fast and right. Every quarter with a C-player in a key role bleeds value that doesn't come back.
Why the veteran model fits
The 60-month holding period typical in lower-middle-market private equity maps almost exactly to the timeline it takes to develop a leader in the United States military. Not coincidence. Pattern.
Military formation is not theory. It runs on assessment, feedback loops, escalating responsibility, and operating in degraded environments — exactly what you face inside a founder-owned $8M EBITDA business that has never had a management layer between the owner and the floor.
An EOD officer doesn't walk into an uncertain situation and wait for more information. The training forces decision-quality under constraint. You identify what you know, account for what you don't, make the call, and execute. Uncertainty doesn't get a vote.
That disposition is exactly what LMM operating partners need. The companies they enter are information-poor environments. The processes are informal. The data is incomplete. The founder is often both the asset and the problem. An operator trained to make high-stakes decisions with incomplete information — and to build systems so those decisions are better next time — is not a coincidence fit with the LMM model. It is a structural one.
The Association for Corporate Growth has formalized a Veterans in the Middle Market track at its DealMAX conference, connecting transitioning special operations veterans directly to PE and M&A firms. DoD's SkillBridge program lets transitioning service members spend their final six months on active duty embedded inside a civilian company at no cost to the employer. The talent pipeline is real. The industry has recognized the match.
What to look for
The recruiters will hand you a framework: functional expertise, board-level presence, strategic vision. That is the wrong list for LMM.
The right list starts with whether they have built something under constraint. Not managed something someone else built. Built it — from an informal process or a spreadsheet or a verbal system that lives only because the founder made every call. If they cannot point to a specific system they built from nothing, ask harder questions.
The second filter is execution speed. LMM hold periods run 4–6 years. The first year sets the trajectory. An operating partner who needs 12 months to assess and 12 more to plan has already lost the window where easy wins compound. You need someone who can close the books in the first 90 days and have a version of the operating infrastructure running before the first annual review.
The third is talent judgment — the ability to assess the portco's senior team fast and call the ones who have to go. Not in year two. In month three.
The operating partner is the bet
Leverage used to do the work. Now operators have to.
The PE operating partner role has moved from board-level advisor to the most consequential role in the deal structure outside the GP's investment decision itself. In lower-middle-market PE, where the professionalization gap is widest and the margin expansion potential is greatest, the quality of the operating layer is the difference between a 2x and a 3x.
The firms that win the next decade of LMM investing are not the ones with the most sophisticated financial models. They are the ones who built the operator pipeline — people who can walk into a $7M EBITDA business and build a company worth exiting at $20M.
That is the mission. The operator is the weapon. Choose carefully.
