Private markets are now a portfolio-design problem

The debate over whether wealthy clients should hold private assets is effectively over. The struggle now is structural: how to fit illiquid positions into portfolios designed around daily-priced public markets. Brian Griggs, head of Nuveen's portfolio strategy group, works with registered investment advisors, wealth managers, and family offices that are trying to answer that question.

In a conversation with InvestmentNews, Griggs described how the old sales motion — private markets as a satellite allocation to a stock-and-bond core, meant to add incremental return for select clients — has lost its force. "Today, the conversations are centered around portfolio design," he said, "what role the allocation is meant to play, how it affects liquidity, and whether it improves the client's after-tax, risk-adjusted outcome."

That may sound like a subtle shift, but the consequences are not. An advisor evaluating a private credit fund or a ten-year buyout commitment must now weigh liquidity terms, valuation methodology, tax treatment, and correlation across the entire book. Expected return alone is no longer enough. The unified risk framework Griggs describes cuts across the traditional divide between public and private holdings.

Education, he said, is the limiting factor. "The success of private markets implementation often depends less on access and more on whether the allocation is properly sized, funded, and explained." Access to quality funds is abundant. The constraint is advisor competence in explaining what the client is buying and why.

Within that three-part test, funding is where the design tends to break. Griggs calls the decision about which public assets to trim one of the most consequential that advisors face. His prescription is to start with the client objective, not a generic target allocation. "The source of capital should start with the client objective," he said. An income-oriented private investment may be funded out of the fixed-income sleeve; a long-term growth mandate may come from equities.

The rationale is easy to state and hard to execute. Every funding choice is, in effect, a relative-value call between the public asset being sold and the private asset being bought. It also changes the liquidity profile of the overall portfolio: selling a daily-priced ETF to buy a fund with quarterly gates is a different kind of trade than rebalancing between two liquid sleeves.

Griggs acknowledges the trade-offs are layered. Private allocations can improve income, diversification, or inflation sensitivity while simultaneously introducing illiquidity, manager dispersion, valuation lag, and cash-flow uncertainty. The goal, he said, is not to displace traditional holdings wholesale but to build a more resilient portfolio that does not lean on the stock/bond relationship in every environment.

For an RIA principal, the lesson is operational. Private-market allocations should carry a written rationale that identifies the client objective, the funding source, and the liquidity consequences. If the rationale cannot be stated clearly, the allocation is probably a product placement rather than a portfolio decision. Griggs's framework turns that test into a discipline.

The broader shift is worth noting. The private-markets conversation has matured from "should we" to "how should we." That maturity is what allows the asset class to grow past the early adopters. The firms that master the funding and explanation work will have a competitive advantage; the ones that treat private assets as a performance-add on top of an unchanged process will have a compliance problem waiting for them.