The 200,000-Company Landscape: Where Institutional Capital Still Falls Short in the U.S. Middle Market

The American middle market is frequently invoked by dealmakers but rarely sized with precision. According to the National Center for the Middle Market (NCMM) at Ohio State University’s Fisher College of Business, there are nearly 200,000 U.S. businesses with annual revenues between $10 million and $1 billion.¹ Collectively, these companies account for approximately one-third of private sector gross domestic product and employ roughly 48 million people—a labor base that rivals the combined workforces of several major global economies.¹ By any standard measure, this segment constitutes the backbone of the domestic economy. Yet the distribution of institutional capital across this vast landscape is strikingly uneven, with certain geographies, industries, and company sizes receiving abundant attention from lenders and investors while others remain largely overlooked.

The mismatch between the middle market’s economic significance and its access to institutional capital has deepened over the past decade. The NCMM’s mid-year 2025 Middle Market Indicator, which surveys 1,000 C-suite executives at companies across the full revenue spectrum, found that middle market companies reported an average year-over-year revenue growth rate of 10.7% in the first half of 2025—well above the broader S&P 500 revenue growth rate for the same period—even as economic confidence softened under tariff uncertainty and inflationary pressure.¹ That underlying business performance makes the capital access gap all the more striking.

Mega-Platform Migration and Its Downstream Effects

The concentration of capital at the upper end of the middle market has intensified as the largest private credit platforms have scaled. Direct lending is now the single largest strategy within private credit, having grown from 18% to 52% of total private credit assets under management over the past fifteen years, according to Morgan Stanley Investment Management, citing PitchBook and LSEG data.² Funds managing tens of billions of dollars in assets have increasingly migrated toward larger transactions, typically financing companies with $50 million or more in EBITDA. The gravitational pull of larger deals is driven by straightforward economics: deploying outsized fund vehicles in modest increments is managerially impractical, pushing mega-platforms toward larger check sizes and, consequently, larger borrowers.

This upward migration leaves a significant portion of the middle market—companies with $5 million to $25 million in EBITDA—in a capital access environment that has, paradoxically, become less competitive even as total private credit assets have grown substantially. The Alternative Credit Council, using Preqin data, placed global private credit assets at approximately $2.1 trillion under management as of 2024, with deployment volumes rising sharply.³ Yet the structural benefits of that growth have flowed disproportionately to larger transactions.

Mapping the Underserved Segments

Capital scarcity in the lower middle market manifests along three primary dimensions: geography, industry, and ownership structure. Geographically, companies located outside the major metropolitan corridors—the Northeast, California, Texas, and Florida—face a measurably thinner set of financing options. According to an analysis published by SFNet’s Data Committee in The Secured Lender, the Q1 2025 Middle Market Connect Lender Outlook Survey found that 92% of banks and roughly two-thirds of direct lenders did not lend as much as desired during the first quarter, with deal quality concerns concentrated in secondary and tertiary markets where sponsor coverage is thinner and auction processes less competitive.⁴

Industry composition adds another layer of scarcity. Sectors that lack the recurring revenue profiles favored by growth-oriented lenders—contract manufacturing, distribution, construction services, and agriculture-adjacent businesses—frequently find that their financing options are limited to traditional bank revolver-and-term-loan structures or asset-based facilities that do not capture the full enterprise value of the business. The combination of earnings cyclicality and modest scale creates a natural floor below which most institutional lenders are unwilling to descend, regardless of underlying credit quality.

Ownership structure represents the third dimension. Family-owned and founder-led businesses, which constitute a substantial majority of companies in the lower middle market, often lack the financial reporting infrastructure, governance frameworks, and transaction experience that institutional lenders require. The cost and complexity of bringing these companies to institutional underwriting standards—audited financials, quality-of-earnings analyses, management reporting packages—frequently exceeds what borrowers perceive as justified for a $15 million or $20 million financing. Morgan Stanley Investment Management, in its March 2026 analysis of direct lending’s evolution, noted that banks have fallen by approximately 75% in number since 1984 (measured by FDIC-insured institutions), accelerating the withdrawal of relationship-based lending from smaller companies that historically depended on regional bank credit officers who knew their markets intimately.²

Specialized Lenders Filling the Gap

A cohort of specialized lower-middle-market lenders has emerged to serve this underserved segment, building platforms specifically designed for smaller, more operationally intensive transactions. Their competitive advantage rests not on scale or pricing power but on the willingness and ability to perform the hands-on credit work that larger platforms find uneconomical.

The economics of lower-middle-market lending support this specialization. Spreads on transactions in this segment remain meaningfully wider than those available in the upper middle market, reflecting both limited competing capital and the higher per-dollar cost of origination and monitoring. According to the SFNet lender survey for Q1 2025, banks broadly accepted first-lien spreads below 375 basis points, while direct lenders in the lower middle market were operating in the 450–475 basis points range—a premium that reflects structural and competitive differences between segments.⁴

Credit performance data lends further support to the lower-middle-market case. Morgan Stanley Investment Management’s March 2026 analysis cites Cliffwater Direct Lending Index data showing that the broader CDLI—representing senior and non-senior loans across middle market borrowers—produced an estimated annualized loss rate of 1.47% through September 30, 2025.² The explanation for competitive loss performance lies partly in structural protections—lower-middle-market loans are far more likely to include maintenance financial covenants, providing lenders with early intervention rights—and partly in the lower leverage levels that prevail in smaller transactions.

The Investment Banking and Advisory Opportunity

The capital scarcity in the lower middle market has created meaningful opportunities for investment banking boutiques and advisory firms that can bridge the gap between borrowers and institutional capital. According to SFNet data, lower-middle-market deals below $250 million in facility size represented the most active segment of new activity in Q1 2025, even as larger platform LBOs slowed under macro uncertainty.⁴ The challenge for intermediaries is that many potential sellers and borrowers in this segment have never engaged an investment bank and require significant education about process, valuation, and deal structure.

Several regional investment banks and advisory firms have built their practices around this educational approach, combining transaction advisory with strategic planning services that help owners prepare their companies for a capital event over a twelve-to-twenty-four-month horizon. This preparation-to-transaction model generates advisory revenue while building a proprietary pipeline of companies ready for institutional engagement—an approach that has proven particularly effective in manufacturing, distribution, and services sectors where succession planning drives the majority of transaction activity.

For private credit lenders, the lower middle market also presents an origination challenge that rewards relationship depth over breadth. Unlike the upper middle market, where sponsor coverage models and auction processes generate predictable deal flow, sourcing in the lower middle market requires networks of attorneys, accountants, wealth advisors, and regional bankers who encounter financing needs in the course of their daily practice. Several specialized platforms have invested in dedicated business development teams covering secondary markets—a strategy that trades the efficiency of sponsor-driven origination for the pricing advantage and structural protections available in less competitive deal processes.

Structural Barriers to Scaling Capital Access

Despite the evident opportunity, several structural barriers limit the pace at which institutional capital can penetrate the lower middle market. The fixed costs of underwriting, legal documentation, and portfolio monitoring create a minimum transaction size below which many lenders cannot profitably operate. A typical middle market direct lending transaction involves meaningful legal and diligence costs regardless of facility size, making smaller deals proportionally more expensive to originate. The SFNet Q1 2025 lender survey confirmed that direct lenders continue to prefer hold sizes above $100 million, while banks concentrate in the $25–$50 million range, leaving the smallest segment of the lower middle market with the fewest competing options.⁴

Technology is beginning to address some of these cost barriers. Automated financial spreading tools, standardized documentation templates, and portfolio monitoring platforms designed for smaller borrowers can reduce per-deal origination and surveillance costs. But these solutions remain in early stages of adoption, and the human judgment required to assess management quality, competitive positioning, and operational resilience in smaller companies resists easy automation. The fundamental tension in lower-middle-market lending—between attractive risk-adjusted returns and higher unit costs—will likely persist, maintaining the spread premium that compensates specialized lenders for their operational intensity.

Conclusion

The nearly 200,000-company American middle market represents one of the deepest pools of investable opportunity in domestic private credit, yet significant portions of it remain structurally underserved by institutional capital.¹ The migration of large private credit platforms toward bigger transactions, the decades-long consolidation of the U.S. banking industry that has reduced relationship lending to smaller companies,² and the reporting and governance limitations of many family-owned businesses have combined to create a persistent capital access gap in the $5 million to $25 million EBITDA segment. The Q1 2025 lending data confirms that the gap has not closed despite record private credit fundraising: a substantial majority of banks and nearly two-thirds of direct lenders reported deploying less capital than desired in that period.⁴ Specialized lenders, regional investment banks, and advisory firms that build their platforms to serve this segment stand to capture both attractive economics and a durable competitive position. The challenge is developing scalable solutions—technological, structural, and organizational—that can deliver institutional capital to the companies and communities that need it most.

Footnotes

1. National Center for the Middle Market (NCMM), Ohio State University Fisher College of Business — *Mid-Year 2025 Middle Market Indicator*States: “There are nearly 200,000 U.S. middle market businesses that represent one-third of private sector GDP, employing approximately 48 million people.” Also states mid-year 2025 revenue growth rate of 10.7% for middle market vs. S&P 500 at 0.5%.
2. Morgan Stanley Investment Management — *Evolution of Direct Lending*, published March 2, 2026 States: direct lending has grown from 18% to 52% of total private credit AUM over 15 years (PitchBook/LSEG data, as of September 30, 2025); banks have fallen by approximately 75% in number since 1984 (FDIC data as of March 31, 2025); CDLI broader index annualized loss rate of 1.47% through September 30, 2025 (Cliffwater data, footnote 3 of source); middle market accounts for more than one-third of private sector GDP, $15 trillion in revenue and 50 million workers (NCMM and BEA data, footnote 4 of source).
3. Alternative Credit Council / Houlihan Lokey survey, via Preqin data, as reported by Investment Executive — *Global private credit market reaches US$3.5 trillion AUM threshold* States: survey respondents managing approximately $2.1 trillion in private credit assets deployed $592.8 billion across strategies in 2024, up 78% from 2023. Note: the article’s citation of “$2.1 trillion globally” reflects the ACC survey respondent base, not the full Preqin private debt AUM figure, which is a narrower subset; broader estimates (including infrastructure debt and broadly syndicated loan participations) place the global figure higher.
4. Secured Finance Network (SFNet), Data Committee — *Middle Market Lending in 2025: Adjustment Amid Uncertainty*, The Secured Lender, May 6, 2025 States: 92% of banks and roughly two-thirds of direct lenders did not lend as much as desired in Q1 2025 (Middle Market Connect 2Q25 Lender Outlook Survey); lower middle market deals below $250 million were most active segment; banks accept sub-375 bps for first-lien spreads (nearly 60%); direct lenders accept 450–475 bps range (71%); direct lenders prefer hold sizes above $100 million (71%); banks concentrate in $25–$50 million range.