Private Equity's Zombie Fund Problem Is Compounding, Not Clearing
Thousands of private equity firms are sitting on funds too old to keep investing and too illiquid to close, and tightening credit is making the backlog harder to work through.
NEW YORK, August 20, 2026. Private equity has a name for funds that refuse to die: zombies. Industry trackers define them as vehicles more than ten years old that have stopped making new investments but still hold unsold portfolio companies, generating management fees without generating the returns those fees are supposed to fund. By that definition, the population is large and growing. PitchBook counts more than 3,300 zombie firms in the United States alone, a number that has been climbing since valuations peaked in 2021 and financing conditions turned against the strategy of simply waiting for a better market.
The scale of capital involved has grown alongside the count. Roughly $1.2 trillion is currently stuck in zombie funds globally, about 12 percent of worldwide private equity assets under management, according to data compiled by Preqin, Treo Asset Management, and Jefferies' secondary market research group. That figure is up 38 percent from a year earlier and has nearly tripled since 2019; some estimates put it on track to reach $2 trillion within a few years. The average zombie fund is 14 years old, four years past the typical ten-year fund life that limited partners originally signed up for.
The holding-period data tells the same story from a different angle. At the end of 2025, roughly 40 percent of PE-backed companies in the United States, representing more than $860 billion in net asset value, had been held for more than seven years, up from 20 percent a decade earlier. Of the more than 6,400 US portfolio companies held longer than five years, more than half had not completed any transaction, buy or sell, since the end of 2021. Median hold periods across the industry have stretched from roughly 5.1 years in 2020 to 6.3 years in 2025, and further still in the oldest vintages.
Fundraising has absorbed the damage. Of 2,314 private equity managers who raised a fund in 2015, 40 percent never raised a subsequent one, either folding entirely or stalling out after a single follow-on effort. Buyout fundraising totaled $661 billion across 1,191 funds in 2025, down from $807 billion across 2,679 funds in 2021, and the average fund now takes 23 months to close, up from 16 months four years ago. "A lot of funds that exist today won't necessarily exist five years from now," Veritas Capital chief executive Ramzi Musallam has said of the shakeout underway.
General partners have reasons beyond stubbornness to hold on. Selling a portfolio company below its marked value crystallizes a loss and can complicate the pitch for a firm's next fund, while the fee stream from an unsold company keeps flowing as long as it stays on the books. Tom Donovan, a banker at Houlihan Lokey who works with sellers in this position, has pointed to that fee dynamic as a quiet driver of the reluctance to sell. Continuation funds have emerged as one release valve, letting a firm move an aging asset into a new vehicle, return some cash to existing investors, and keep managing the company rather than exiting it outright: the market for these vehicles raised $62 billion in 2024 and more than $40 billion in the first half of 2025 alone. But continuation vehicles work best for the strongest assets in a portfolio, industry advisors say, leaving the weaker majority with fewer options.
Tightening credit conditions this year have narrowed the path further. Distributions to limited partners, which ran at more than 25 percent of net asset value a decade ago, have averaged closer to 11 percent over the past three years, and a wobblier corporate bond market has made the debt-financed exits and recapitalizations that once provided a release valve more expensive to execute. "Your money can get trapped," Verdad Advisors founder Dan Rasmussen has said of the illiquidity now facing limited partners who assumed a ten-year fund would behave like one. For the pension funds, endowments, and sovereign wealth funds waiting on distributions from funds now well into their second decade, that trap is no longer a tail risk. It is the base case.