A portfolio whose composition is endogenously determined. In other words, an endogenous portfolio is constructed from components handpicked and selected by its manager, without using a market-tracking collection of assets or an indexed collection. The performance of such a portfolio solely depends on the collective performance of, and the inter-relationships amongst, its components.

It may also imply the situation where a portfolio is based, in terms of its structure, on endogenous resources, rather than externally sourced financial components (as opposed to an exogenous portfolio), such as debt or debt instruments, etc.