Under What Conditions Is Private Equity Prudent in Retirement Plans?

As of June 2026.

The 401(k) rule is the news. The discipline underneath it is the point — and it is not unique to defined-contribution plans. What the Department of Labor has proposed for plan fiduciaries is, in substance, the analytical standard that endowments, pensions, sovereign wealth funds, and other sophisticated allocators have operated under all along. The 401(k) inflection simply makes it visible, and urgent, to a far larger set of fiduciaries at once.

Where this stands

For two decades, private equity sat almost entirely outside defined-contribution retirement plans — kept there less by prohibition than by caution. That caution is now being deliberately unwound:

• August 2025: Executive Order 14330 directed regulators to facilitate alternative assets in 401(k) plans. Days later, the Department of Labor rescinded its 2021 statement that had warned fiduciaries against private equity, restoring the more permissive 2020 guidance.
• Late March 2026: the DOL proposed a process-based safe harbor for selecting investment options that include alternatives — built around six factors: performance, fees, liquidity, valuation, benchmarks, and complexity.
• June 1, 2026: the comment period closed, drawing roughly 45,000 comments — an unusually large response. The rule is now proposed, not final; a final rule is expected by year-end 2026 and its exact wording is not yet settled.
• In parallel, the Supreme Court has agreed to hear Anderson v. Intel, a case on the ERISA standard for pleading imprudence — the "meaningful benchmark" question — though it has not yet been argued.

So the direction is set, but two of the most consequential pieces — the final shape of the safe harbor and the litigation standard fiduciaries will be held to — remain open. Meanwhile, asset managers are already launching alternatives-inclusive target-date products ahead of the final rule.

The part that is easy to miss

The debate in the press is mostly about whether private equity belongs in retirement plans. The more practical question is how a fiduciary would evaluate it if it did — and that is where the proposed safe harbor places its weight.

A process-based safe harbor protects fiduciaries who follow a documented analytical process. It does not lower the underlying duty of prudence; it specifies what a prudent process now consists of. And for private-market assets, each of the six factors is materially harder than its public-market equivalent:

• Performance requires risk-adjusted comparison against an appropriate benchmark — and for private assets, benchmark selection is itself a contested, consequential choice.
• Fees must be assessed across carried interest, hurdle rates, catch-up provisions, and fund-of-fund layering — structures unfamiliar to most plan committees.
• Liquidity must be modeled against daily-valuation and participant-redemption realities — a live concern, given that several large private-credit vehicles restricted redemptions in early 2026 when requests surged.
• Valuation — the assessment of methodology, frequency, and provider independence in the absence of market prices — is the single hardest of the six, and the area where under-resourced fiduciaries are most exposed.
• Benchmarks are not a given but a documented fiduciary decision in their own right.
• Complexity asks for an honest assessment of whether the committee has the expertise to monitor the investment at all.

The same discipline, two very different starting points

This is where the 401(k) framing both clarifies and understates the issue. The six factors are not a new invention; they are a written-down version of what prudent private-markets evaluation has always required. Endowments, pensions, and sophisticated LPs have carried this burden for years — and they meet it with dedicated investment teams, established benchmarking practices, and valuation governance built up over time.

A corporate benefits committee overseeing a large 401(k) plan starts from a very different place: HR executives, finance officers, and perhaps outside counsel — capable professionals, but rarely specialists in evaluating private-equity managers or assessing valuation methodology. For them the safe harbor is a standard they must now build toward quickly.

But the underlying demand is the same for both, and worth stating plainly: a process-based standard only protects the fiduciary who can actually run the process. Even well-resourced institutional allocators feel the cost of it — the six factors describe a quantity of analytical and documentation work that scales with every manager evaluated, and that must hold up to a regulator or a court. The DC inflection raises the question for a new and larger audience; it does not change the answer for the rest.

The honest read

Whether alternatives belong in retirement plans is a policy question on which reasonable parties disagree — critics point to higher fees, weaker recent returns relative to public equities, and liquidity risk; proponents to diversification and access. That debate will continue.

There is a more tractable question, and a more durable one: not whether alternatives belong in retirement plans, but under what conditions their inclusion is prudent. And here the answer does not depend on how the rule is finalized or how the Supreme Court rules. Prudent access to private markets — in a 401(k) or anywhere — rests on two things together. The first is understanding: the people making and bearing the decision, fiduciaries and plan participants alike, have to grasp the risk–reward trade-offs that make private assets different from a public index fund — the illiquidity, the fee load, the dispersion of outcomes, the valuation uncertainty. The second is capability: the analytical and documentation infrastructure to evaluate and oversee these assets to the standard the six factors describe.

Access without both is the imprudent path — and that is true whatever the regulation's final shape. The critics are right that opening these assets to savers who cannot assess them, overseen by fiduciaries who lack the means to evaluate them, would be a mistake. The conclusion that follows is not that access is wrong, but that the education and the infrastructure have to come with it. That pairing — the part that makes the difference between prudent and reckless — is the part of this story the headlines have not yet reached.

This note reflects the state of play as of June 2026; the proposed rule is not final and the Supreme Court case has not been argued. A fuller treatment of the six-factor analytical requirements is available on request.