Accessing meaningful diversification through the U.S. middle market

As companies remain private longer and scale further outside the public markets, the line between large private and public companies is blurring. Explore insights from our Financial Times partnership on diversification, market concentration and the U.S. middle market.
Blurring of public and private

PRIVATE EQUITY AND THE ILLUSION OF DIVERSIFICATION

Abundant private capital, higher public listing costs, industry consolidation, and a weaker IPO market have enabled companies to scale while remaining private for longer. As a result, the upper end of private equity increasingly resembles the public market in company size, sector composition, economic exposure and valuation sensitivity, making selectivity within the asset class increasingly important.

For investors seeking differentiated exposure, the U.S. middle market offers a distinct opportunity set. Compared with the upper end of private equity, middle market companies operate across a broader range of a broader range of industries and represent a sector mix that more closely mirrors the U.S. economy.


Middle market offers diversifying sector exposure
Sector composition of public and private equity market

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Source: U.S. BEA, Bloomberg Finance, L.P., Pitchbook, as of Q1 2025.

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“Private Equity and the Illusion of Diversification”

INSIGHTS FROM OUR CIO

Finding diversifying sources of growth in the middle market

Public markets no longer capture the full engine of economic growth. As companies stay private longer, an increasing share of that growth now resides in the private market. But as public markets and the upper end of private equity continue to converge, private no longer guarantees diversification.

As companies stay private longer, an increasing share of corporate growth is occurring in the private market. While this expands the opportunity set for private equity, it also makes selectivity increasingly important for investors seeking to diversify their public market exposure.

The middle market may offer diversifying sources of return, with growth drivers that differ from public markets and large cap private equity. Additionally these businesses often have lower entry valuations and greater ability to drive operational value creation. In this conversation, CIO Mike Kelly and Head of Private Equity Solutions Dan Wilk discuss where investors may find diversification in today's concentrated market.
Capitalizing on the next phase of the AI cycle

RETHINKING DIVERSIFICATION IN THE AGE OF AI

Public markets are increasingly dominated by a small group of mega-cap companies driving the AI buildout. We estimate that businesses tied to the AI investment theme represent 46% of the S&P 500 today. This leaves many portfolios with substantial exposure to mega-cap technology platforms, chip manufacturers and related infrastructure suppliers. These may be excellent businesses, but for many investors, the exposure is outsized. 

Our Investment Research team’s recent report, Hidden Layers: Rethinking Diversification in the AI Era, we quantify AI exposure across equities, credit, real estate and infrastructure, helping investors identify concentration risks in portfolios that a traditional asset class framework may mask.
Report

HIDDEN LAYERS: RETHINKING DIVERSIFICATION IN THE AI ERA

As AI becomes a cross-asset investment theme, we provide a framework for measuring portfolio exposure across public and private markets.

Read our latest research
“Private Equity and the Illusion of Diversification”

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