LP commitments to impact-focused secondary transactions remained effectively unchanged through 2024 even as the broader secondaries market expanded 18% to $142 billion in transaction volume. The constraint is not capital availability. It is the inability of fund sponsors to construct differentiated narratives around alignment and measurable outcomes.

Secondaries Investor's LP demand survey, released this month, shows that 63% of limited partners expressing interest in secondaries activity allocated zero capital to impact-labeled vehicles. Among the 37% that did allocate, average ticket sizes declined 12% year-over-year to $18 million per commitment. Meanwhile, traditional buyout and venture secondaries saw ticket sizes rise 9% and 14% respectively. The divergence is structural. Impact sponsors are asking LPs to accept liquidity constraints and performance drag without offering clarity on what the premium buys.

The articulation failure shows up in three places. First, fund marketing materials for impact secondaries rely on ESG taxonomies that LPs already discount as compliance theater. Second, sponsors struggle to separate alpha generation from impact attribution — a $50 million secondary stake in a clean-tech portfolio company is described identically whether purchased at 0.72x or 0.91x NAV. Third, pricing models for impact assets lack the granularity that allocators use to justify liquidity premiums elsewhere. A family office reviewing a growth-equity secondary can model exit multiples and cash-on-cash returns with reasonable confidence. The same office reviewing an impact secondary gets handed a PowerPoint deck with Sustainable Development Goals icons.

This is not an indictment of impact investing as a category. It is a market signal that secondaries buyers — who are, by definition, paying for someone else's patience to end early — require better tools to price alignment premiums. The secondaries market is functional because it converts illiquidity into a measurable discount. Impact secondaries ask LPs to pay for illiquidity and alignment simultaneously, then fail to price either component cleanly. The result is predictable: LPs default to traditional secondaries where pricing mechanisms are transparent and execution risk is lower.

Operators should watch three follow-on developments over the next six months. First, whether any top-quartile secondaries funds launch impact-dedicated vehicles with explicit pricing waterfalls that separate liquidity discount from impact premium. Second, whether LP advisory groups at the largest consultants begin publishing impact secondary pricing benchmarks, which would force standardization. Third, whether any large endowments or sovereign wealth funds publicly describe their decision framework for impact secondary allocations, creating a template others can borrow.

The secondaries market works because it transforms time into price. Impact secondaries stall because sponsors ask LPs to believe that alignment has value without showing them how to calculate it. Until that changes, capital stays in vehicles where the math is legible.