Dry powder against deal count: Why diligence windows keep shrinking

The exhibit plots 2 Bain series from 2021 through 2025. Buyout dry powder, the stock of committed but uncalled capital, climbed from roughly $1 trillion in 2021 to $1.3 trillion in 2025, and it did not fall in any year of the downturn.

Annual buyout deal value, the flow, moved the other way: it fell 60 percent from its $1.1 trillion peak in 2021 to $438 billion in 2023, then recovered to $904 billion in 2025. Divide the stock by the flow and you get the overhang ratio, the years of deployment queued in dry powder. It reached close to 3 years at the 2023 trough, and even after the rebound it sits near 1.5 years, still above the 2021 reading of under 1.

A large overhang ratio is a diligence problem before it is a returns problem. When plentiful capital meets a scarce set of quality assets, sellers run tight, competitive processes, and the diligence window is the first thing that gets compressed. The 2025 recovery does not relieve that pressure: it came from 13 deals of $10 billion or more, which drove 69 percent of the growth, while the number of deals fell 6 percent to 3,018. The count of assets to diligence did not recover.

The queue is also aging, with a rising share now 4 years old or older, and it cannot drain, because distributions have run below 15 percent of net asset value for 4 years, a record, and roughly 32,000 unsold companies worth $3.8 trillion are still waiting to exit. Undeployed capital is why diligence timelines compress; stuck liquidity is why they will not decompress.

The wider lesson runs past private equity. When a market's binding constraint is structural rather than cyclical, waiting for it to loosen is not a plan, and the teams that win are the ones that redesign the work around the constraint from the start. Here that means treating the compressed window as the base case, not the exception, and settling in advance which questions the diligence will actually answer and which it will let go.