What Is Driving the Growth

Three structural forces drive private credit expansion. Regulatory constraints on US banks persist despite the recent withdrawal of the 2013 leveraged lending guidance. Institutional investors have increased allocations in search of higher yields and diversification. Borrower demand for flexible, bespoke financing continues to grow, particularly among middle-market and PE-owned businesses.

The AI infrastructure buildout has added a new dimension. Morgan Stanley estimates private credit could supply more than half of the $1.5 trillion needed for global data centre buildouts through 2028. Apollo's 2026 credit outlook described AI as a major source of incremental credit demand. Private credit managers see an opening because banks may not be willing to hold the exposure.

Where the Strain Is Starting to Show

The market has genuine stress emerging beneath the headline growth. Early 2026 saw a surge in redemption requests from evergreen direct lending strategies as investors questioned AI's potential to disrupt software business models. PIK interest use has expanded, meaning borrowers pay interest by issuing more debt. This preserves borrower liquidity short-term but compounds indebtedness. Higher rates have strained borrowers who leveraged aggressively.

Valuation opacity is becoming visible. Unlike public bonds where pricing is continuously market-tested, private credit loans are marked at manager estimates. When defaults rise, mark accuracy comes under scrutiny.

What This Means for the Financial System

The private credit market is now large enough that its problems become the financial system's problems. If defaults rise materially, the impact flows through pension allocations, insurance balance sheets, and asset manager performance. The 2008 crisis was driven partly by opaque credit markets regulators did not understand until they broke. Private credit is not identical, but the pattern of rapid growth outside traditional oversight is worth taking seriously.

The counter-argument is that private credit has not fueled a single concentrated bubble like subprime. Most companies have alternative financing. Fund managers have skin in the game. Whether these mitigants prove sufficient depends on how default rates evolve.