Private equity investors are bracing for a sharp divergence in fund performance as the industry grapples with a massive $4 trillion backlog of unsold assets, according to Apollo Global Management.

The warning comes from the firm's deputy global head of private equity, who highlighted that years of delayed exits and inflated valuations are creating a structural squeeze on returns across the sector.

The outlook introduces a significant headwind for the recent software rally, which has seen the iShares Expanded Tech-Software ETF (IGV) surge 35% from its April lows.

The outlook introduces a significant headwind for the recent software rally, which has seen the iShares Expanded Tech-Software ETF (IGV) surge 35% from its April lows.

While software stocks have staged a notable comeback driven by renewed optimism about the tech sector's resilience, Apollo's assessment suggests that the private equity firms heavily invested in these names may struggle to realize gains.

The firm specifically flagged software as the area most at risk of a returns bifurcation, where top-tier performers pull away from the rest of the pack.

The core of the problem lies in the exit environment.