Combining Public and Private Assets Without Hiding Risk

The decision in brief

Classify investments by underlying exposures and vehicle terms, assess valuation uncertainty, and size private commitments against stressed cash availability. Compare performance using compatible periods, cash flows, and fees. Approve a private allocation only when its purpose, funding demands, information requirements, and governance burden are understood independently of any smoother reported return series.

Start with exposure, then examine the vehicle

Describe the underlying businesses or assets, their leverage, geography, sector, and sensitivity to economic conditions. Then describe how the family owns them. A public share, a closed-end partnership, and a periodically redeemable vehicle can expose investors to related assets while offering different control, disclosure, valuation, and withdrawal arrangements. Neither the word private nor a long holding period proves diversification.

The SEC's Private Equity Funds education explains that these funds often pursue long-term opportunities and restrict withdrawals. Its private-placement bulletin also highlights limited disclosure and illiquidity. Read those characteristics as due-diligence requirements rather than as a judgment that every private investment is unsuitable. The committee must determine whether the specific structure and risks fit the family's obligations and ability to monitor them.

Do not confuse reported smoothness with economic stability

Listed prices can change continuously while private valuations may arrive less frequently and rely more on estimates. A quiet valuation series is therefore not sufficient evidence that the underlying economic value barely changed. Ask how valuations are prepared, which inputs are observable, when information becomes available, and how subsequent transactions compare with earlier marks. Separate uncertainty about value from certainty about cash availability.

AQR's Volatility Laundering perspective criticizes treating smoothed private-asset returns as a faithful measure of underlying risk. That is an identified analytical concern, not proof that a particular fund is misvalued. For committee analysis, retain reported values but add clearly labeled economic stress estimates. Do not manufacture daily prices or present a chosen public-market proxy as an observed private-asset return.

Work through a synthetic denominator effect

Assume an illustrative USD 100 million portfolio with USD 60 million of public assets, USD 30 million of private assets, and USD 10 million of cash. Public assets fall 25% to USD 45 million while private marks and cash remain unchanged. Total reported value becomes USD 85 million, and the private allocation rises from 30% to about 35.3% without a new private investment.

Now apply a separate, synthetic 20% economic haircut to private assets. Their estimated value becomes USD 24 million and the portfolio USD 79 million, producing a private weight of about 30.4%. Neither weight alone answers whether more commitments are affordable. Outstanding commitments and payment needs must be tested separately; they are not assets to add to the denominator and are not automatically due in full immediately.

Compare performance on compatible terms

A private fund's internal rate of return is not directly interchangeable with a public fund's annual time-weighted return. Capital moves at different dates, fees differ, and remaining private value is an estimate. Request cash flows, valuation dates, paid-in capital, distributions, and residual value. A high reported percentage can coexist with little distributed cash, so performance reporting should distinguish realized proceeds from estimated remaining wealth.

The CFA Institute article Clearer Way to Benchmark Private Equity discusses limitations of fund-level benchmarks and the need for better exposure and investment-level comparability. Use a documented comparison method, including appropriate cash-flow alignment where relevant, and explain its limitations. Do not choose the benchmark after seeing the result. Peer rankings can inform manager review but cannot by themselves establish superiority over an implementable public alternative.

Treat funding capacity as a separate gate

Model existing commitments, likely call timing, slower distributions, family spending, and stressed public-asset proceeds together. A target private allocation does not supply cash for a notice arriving next month. Conversely, a temporary rise in reported private weight may not justify an immediate secondary sale at an unfavorable price. Distinguish allocation monitoring, commitment pacing, and actual liquidity actions in the decision record.

Evaluate whether staff and advisers can review terms, reconcile notices, challenge valuations, and monitor exposures across managers. Additional diversification on a slide may come with substantial operational demands. Compare the proposed investment with simpler ways to obtain its economic exposure, without assuming that either route is always better. The relevant question is what incremental benefit the specific structure offers after costs, restrictions, and uncertainty.

Approve information and exit expectations in advance

Before committing, specify required reporting, the role of each valuation, acceptable concentration, and the treatment of delayed information. Understand withdrawal terms and potential transfer restrictions from the actual documents. An advertised dealing frequency does not establish that every requested redemption can be completed in full. Avoid relying on a prospective secondary sale as the sole source of funds for essential family obligations.

Implementation questions include who verifies cash-flow records, how commitments enter the central budget, and which review is triggered by material valuation or strategy changes. Identify the intended benefit without promising an illiquidity premium or superior returns. The committee should be able to explain why the investment belongs in the total portfolio even if its reported returns become less smooth and its distributions arrive later than hoped.

Decision points

Public and private structures can share substantial underlying economic risks.
Maintain separate views of reported value, stressed value, and spendable proceeds.
Judge private investments on compatible evidence and actual funding capacity.

Sources and further reading

The linked sources provide conceptual background. The worked examples and planning assumptions on this page are this publication's own illustrations.