Key Takeaways
- • U.S. private-equity assets stuck in funds at least a decade old reached an all-time high of $348.5 billion at the end of 2025, with over $1 trillion estimated to be trapped in "zombie" funds across the industry.
- • Private equity fundraising has collapsed 87% from its 2021 peak, declining from $551 billion (2024) to $491 billion (mid-2025), with only 364 funds closing versus 2,700 at the 2021 peak, creating severe capital constraints for portfolio exits.
- • Hundreds of PE firms are holding portfolios of nearly unsaleable investments far longer than planned, with slower exits, minimal distributions, and stalled fundraises compounding the problem of capital lockup.
- • Zombie firms—portfolio companies and aging funds that consume capital and attention without generating returns—now represent a systemic challenge, with the median NAV for older buyout funds showing steady increases since 2021 despite prolonged holding periods.
- • Institutional investors are losing patience with PE firms unable to exit positions, and secondary market surveys from Coller Capital indicate the number of zombie funds is expected to continue growing.
Summary
The private equity industry faces an unprecedented liquidity crisis, with institutional capital increasingly trapped in aging funds and underperforming portfolio companies. According to PitchBook data, U.S. private-equity assets locked in funds at least a decade old hit an all-time high of $348.5 billion at the end of 2025. More broadly, over $1 trillion is estimated to be stuck in "zombie" funds—a term describing both aging funds and portfolio companies that consume capital and management attention while generating minimal returns or distributions to investors.
The root cause of this bottleneck lies in a dramatic collapse in fundraising activity. PE fundraising declined from $551 billion in 2024 to $491 billion by mid-2025, representing an 87% decline from the 2021 peak when the industry closed 2,700 funds. In 2026, only 364 funds have closed year-to-date, illustrating the severe contraction in capital formation. This fundraising drought has severely restricted PE firms' ability to distribute capital to existing investors and has made exits from portfolio companies increasingly difficult. Many firms are now clinging to nearly unsaleable assets far longer than their original investment timelines permitted.
The zombie dynamic is characterized by slower exits, light or suspended distributions, and stalled fundraising efforts. Institutional investors have grown impatient with PE firms unable to execute exits or return capital. The median NAV for older buyout funds has been steadily increasing since 2021—the year before funds reach their "zombie age"—suggesting both mark-ups on aging assets and the accumulation of uninvested capital. According to secondary market surveys conducted by Coller Capital, investors expect the number of zombie funds to continue expanding, indicating this is not a temporary market dislocations but rather a structural challenge within the PE ecosystem.
The implications for institutional investors and family offices are significant. Capital committed to aging PE funds faces extended lockup periods with uncertain exit timelines, while PE firms themselves face mounting pressure to demonstrate value creation in stagnant portfolios. The combination of elevated dry powder in mature funds, constrained fundraising, and competitive pressure to achieve returns has created a vicious cycle that threatens both fund performance and the return of capital to limited partners.
The root cause of this bottleneck lies in a dramatic collapse in fundraising activity. PE fundraising declined from $551 billion in 2024 to $491 billion by mid-2025, representing an 87% decline from the 2021 peak when the industry closed 2,700 funds. In 2026, only 364 funds have closed year-to-date, illustrating the severe contraction in capital formation. This fundraising drought has severely restricted PE firms' ability to distribute capital to existing investors and has made exits from portfolio companies increasingly difficult. Many firms are now clinging to nearly unsaleable assets far longer than their original investment timelines permitted.
The zombie dynamic is characterized by slower exits, light or suspended distributions, and stalled fundraising efforts. Institutional investors have grown impatient with PE firms unable to execute exits or return capital. The median NAV for older buyout funds has been steadily increasing since 2021—the year before funds reach their "zombie age"—suggesting both mark-ups on aging assets and the accumulation of uninvested capital. According to secondary market surveys conducted by Coller Capital, investors expect the number of zombie funds to continue expanding, indicating this is not a temporary market dislocations but rather a structural challenge within the PE ecosystem.
The implications for institutional investors and family offices are significant. Capital committed to aging PE funds faces extended lockup periods with uncertain exit timelines, while PE firms themselves face mounting pressure to demonstrate value creation in stagnant portfolios. The combination of elevated dry powder in mature funds, constrained fundraising, and competitive pressure to achieve returns has created a vicious cycle that threatens both fund performance and the return of capital to limited partners.
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