European lower mid-market corporate and infrastructure debt: the diversification investors are missing
8 OCT, 2026
By LBP AM
By Peter Arnold, Head of European Private Markets at LBP AM; Bérénice Arbona, Head of Infrastructure Debt at LBP AM; Isabelle Luy-Landès, Head of Corporate Direct Lending at LBP AM.
Although it is a less-travelled area of private markets, the European lower mid-market is in fact where the greatest degree of diversification can be found: solid founder-led companies and local infrastructure contributing to the energy, generational and digital transitions. As the credit cycle matures, this segment is emerging as a strategic component of private debt portfolios.
The European lower mid-market is a broad, fragmented and largely undervalued market. It encompasses a large number of companies across different countries, sectors and business models – from long-established family businesses and founder-led firms to companies backed by private equity sponsors with minority or majority stakes. This breadth allows private debt investors to build portfolios with far greater granularity in position sizes and across a wider range of sectors than the large-cap segment.
Family businesses account for more than 70% of all European companies, and generational succession will be one of the defining themes of the coming decade. Many of these businesses are highly profitable and sustainable, but they need flexible capital to manage ownership changes, finance value-accretive acquisitions, fund international expansion, or invest in their digital transformation and environmental transition. Domestic banks are often unable to provide this kind of tailored lending, creating a persistent financing gap that private debt can fill.
This is not simply a case of banks retreating: while they still have liquidity, lenders are reconsidering which risk profiles they will keep on their own balance sheets, leading them to partner increasingly with private lenders to serve clients outside those profiles. The result is growing acceptance of private debt as a structural complement to bank financing rather than a substitute for it.
The European market also differs markedly from its US counterpart. In the US, direct lending has a much higher concentration of retail capital, which can amplify volatility when confidence wavers. European private debt remains predominantly institutional, characterised by longer investment horizons and more patient capital, giving managers time to resolve issues with portfolio companies rather than face forced exits. Companies in this segment have repeatedly weathered past crises well, helped by smaller, more agile lender groups able to act early and provide support during periods of difficulty.
Risk dispersion and resilience
Yet the case for the lower mid-market is about more than access to underserved companies: this segment changes a portfolio's risk profile. Lenders can negotiate tighter terms, stronger protections and financing structures genuinely tailored to a company's risk profile, rather than accepting the looser terms that tend to prevail when many lenders compete for very large individual deals.
Many of these companies are also leaders in their sectors: regional or national champions with pricing power, close customer relationships and high barriers to entry protecting their markets. Because portfolios can be built on quality companies rather than chasing sector trends, they tend to be less exposed to crowded themes – such as software and AI, for example – where large volumes of capital compete for the same assets.
As the credit cycle matures, this area of the market becomes increasingly attractive. Problems tend to surface first in large-cap deals, where looser terms and higher leverage offer less protection. Here, tighter terms, closer lender-borrower relationships and more manageable lender groups leave more room to address issues over time. Building exposure to corporate direct lending across the large-, mid- and small-cap segments addresses manager dispersion and results in a more balanced, all-weather portfolio. This is particularly relevant now that the credit cycle is maturing.
Lower mid-market infrastructure: an additional lever
Infrastructure adds another dimension, providing access to a universe of assets and risk drivers different from those of corporate or real estate lending. This segment is in fact the most active and varied area of the European infrastructure market: it accounts for almost 90% of all deals by number and spans renewable energy, digital infrastructure, utilities, transport, environmental services and social infrastructure across a wide range of regions. Because large managers opt for mega-deals, this option remains structurally under-represented in institutional portfolios.
Adding infrastructure debt to a private debt allocation does more than broaden the pool of issuers: it changes a portfolio's default and recovery profile, as infrastructure generally shows fewer defaults and higher recoveries per unit of credit than corporate loans. For insurers subject to Solvency II, this three-level effect – assets, defaults and recoveries – is also rewarded in capital treatment.
Much of this infrastructure operates at a local or regional scale: fibre broadband networks, local renewable energy projects, electric vehicle charging networks, district heating systems, water and waste treatment facilities, and so on. Although individually they tend to be smaller, these assets benefit from long-term contracts, regulatory frameworks or essential-service characteristics that provide strong revenue visibility, while also delivering a tangible impact on the local economy.
Given the scale of Europe's long-term investment needs – from the energy transition to digital connectivity and infrastructure modernisation – public funding alone will not suffice, and private capital will play an increasingly crucial role in closing that gap. Together with its inherent granularity, this positions lower mid-market infrastructure not as a niche exposure, but as an increasingly strategic component of a diversified private markets portfolio.
