The J-curve describes the typical return trajectory of a private equity or venture capital fund. In the early years, the fund incurs management fees and expenses while investments are made at or near cost — resulting in a negative reported return. As the portfolio matures and investments are marked up (or realised at a gain), returns turn positive and ultimately — in successful funds — achieve an accelerating upside.
The shape of the curve resembles the letter 'J': an initial dip below zero followed by a strong upward trajectory. LPs must understand the J-curve dynamic to avoid incorrectly interpreting early negative performance as a signal of poor fund quality. Secondary market transactions in fund interests are partly driven by LPs seeking to avoid the early J-curve drag in newer fund commitments.