The traditional 60/40 strategy "shock absorber" has failed! Carlyle warns: US stocks and bond correlation soars to 0.63, private equity ABF becomes the new solution

According to the Zhitong Finance APP, as inflation becomes a persistent backdrop for the global macroeconomy, a cornerstone that has supported decades of asset allocation theory is crumbling. Akhil Bansal, Head of Asset-Backed Financing (ABF) at Carlyle Group, warned in an interview on Monday that the reliability of traditional fixed income products as a shock absorber in investment portfolios is declining, as the correlation between these assets and equities has seen a structural surge.

“The diversification benefits that fixed income is supposed to provide don’t seem to be working,” Bansal said bluntly in the interview. The math reveals the severity of this shift: from 2010 to 2020, the correlation between public fixed income and equities was only 0.13, indicating that the two often moved in opposite directions, confirming the classic logic of bonds and stocks as complementary investment choices. However, since 2020, this correlation has soared to nearly 0.63—meaning bonds and stocks are increasingly moving in tandem, and the traditional “hedge” function is disappearing.

Inflation: The “Structural Driver” Behind Positive Equity-Bond Correlations

Bansal attributes this market collapse to accelerating inflation. He states that rising prices simultaneously impact equity and public fixed income investments, erasing the diversification advantages that have supported the classic 60/40 portfolio structure for decades.

This observation is strongly supported by broader market data. According to analysis by the Hitachi Research Institute, since mid-2025, the correlation between US equities and long-term Treasuries has been steadily increasing. During the tariff shock in early April 2026, US equities and long-term Treasuries fell simultaneously, repeating the market dynamics of 2022—the year when the 60/40 strategy suffered its worst performance in 150 years. Osaic has recently cut the fixed income allocation in its 60/40 portfolio from 40% to 31%.

As Bansal said, this higher correlation is a structural change. When inflation rates persist above approximately 2.7%, the equity-bond correlation tends to turn positive—only during economic recessions can US Treasuries still provide hedging functions. Currently, the ongoing Iran war continues to push up energy prices, AI infrastructure investments are driving demand growth, and the combined effects of tariff policies are locking inflation pressure at structurally high levels.

The “Hidden Techification” of the Corporate Bond Market: Concentration Risk Surfaces

Bansal also pointed out a second worrying trend: the concentration risk in the corporate bond market. Investors are discovering that their fixed income portfolios are becoming as tech-heavy as the S&P 500 Index.

This concentration risk is well reflected in the 2026 data. By mid-July, six major tech companies had issued about $244 billion in bonds globally. Barclays estimates that in 2026, global hyperscale data center operators will issue $285 billion in investment-grade bonds, reflecting a market concentration level rivaling that of the “Tech Magnificent Seven” stocks a decade ago.

Bansal noted that companies like Alphabet and Meta are often classified under communication or consumer cyclical sectors rather than technology, which obscures their true positions in the AI and data center boom. This “misclassification” by industry further blurs investors’ true awareness of tech exposure within their portfolios.

UBS estimates that in 2025, global technology and AI-related debt issuance will more than double from the previous year, reaching $710 billion, and may approach $990 billion in 2026. The tidal wave of AI debt is making the US corporate bond market appear safer on the surface while risks lurk beneath—the trillions of dollars that bond investors are providing for AI expansion may ultimately yield less profit than expected, potentially causing seemingly solid companies to fall into trouble.

Carlyle’s Breakthrough Approach: “Low-Correlation” Portfolios of Private ABFs and Energy Assets

In the face of the failure of traditional fixed income diversification, Bansal does not advocate completely giving up fixed income, but rather seeks assets that can generate yields and stability, and have lower correlations with corporate earnings. Bansal makes it clear that ABFs are not intended to replace fixed income, but instead “play the role of generating returns and achieving diversification, a role traditionally filled by public fixed income.”

Carlyle is rapidly expanding its presence in the private ABF space. As of the first quarter of 2026, Carlyle’s global credit business AUM reached $209 billion, with its asset-backed financing strategies exceeding $12 billion, a year-on-year increase of over 30%. Carlyle’s ABF platform managed more than $10 billion in assets as of December 31, 2025. In April of this year, Carlyle raised $1.5 billion in the first round of funding for its newly established asset-backed investment fund. Carlyle’s credit business accounts for about 44% of the firm’s total assets under management.

KKR is also increasing its allocation in this arena. KKR notes that direct lending and ABF have historically had low correlations with fixed income, which helps deliver better long-term investment outcomes. KKR’s ABF platform now manages over $74 billion in assets.

When it comes to AI-related ABF investments, Bansal opposes the blanket exclusion of all AI concepts. He explains that chip financing and data center transactions ultimately rely on cash flow and leasing from investment-grade counterparties—areas where ABF can safely participate. “One of Carlyle’s approaches is that we don’t see AI as a single sector, but rather focus on diversified investment,” Bansal said, specifically highlighting energy and natural gas investments as unique alternative investment strategies in Carlyle’s AI ecosystem.

This contrasts with the latest model from BlackRock for Meta’s data center bond issuance. BlackRock issued $12.55 billion in bonds via a SPV (Sopaipilla Investor), using Meta’s 20-year rental income starting in 2028 as collateral. This off-balance-sheet financing structure allows Meta to access AI computing infrastructure without directly increasing its debt burden—but investors take on concentration risk tied to the creditworthiness of a single tech giant.

This strategy has made substantive progress recently. In June 2026, Carlyle and Diversified Energy announced a $2 billion partnership to invest in US proved developed producing (PDP) natural gas and oil assets. Commenting on the transaction, Bansal said, “Diversified Energy is a leading operator of long-life energy assets and a pioneer in introducing PDP securitization to the institutional market.”