Adding Alternative Investments to a 401(k): Under the 2026 Rule Fiduciary Duties

The 2026 DOL rule and Executive Order 14330 opened the door for private equity, private credit, and other alternative assets in 401(k) menus — and with that access comes new fiduciary exposure. For plan sponsors weighing alternatives, the safe harbor offers protection only to those who can document a rigorous evaluation of each option’s fees, liquidity, and valuation.

Alternative investments carry characteristics that traditional fund menus do not, and each one is a fiduciary consideration the sponsor must evaluate and record.

• Illiquidity that complicates participant transactions and daily valuation.
• Complex, layered fee structures that demand careful benchmarking.
• Valuation methodologies that are harder to verify than public securities.
• Concentration and suitability questions for a participant-directed plan.
• Documentation requirements to qualify for the safe harbor’s protection.

How to Add Alternatives Within the Safe Harbor

The rule does not bless any allocation automatically — it protects a documented process. Sponsors considering alternatives need a disciplined, recorded evaluation.

• Document due diligence on performance, fees, liquidity, and valuation for each option.
• Start conservatively — industry expectation is 2–5% of plan assets initially.
• Memorialize the committee’s rationale for including (or excluding) an option.
• Review fiduciary liability limits, since alternatives can alter the plan’s risk profile.
• Coordinate the investment decision with the plan’s insurance program.

Which Alternative Investments Are Appearing in 401(k) Plans

The 2026 rule does not prescribe which alternative asset classes are permissible. It creates a framework for evaluating them. Plan sponsors considering alternatives need to understand which categories are gaining traction, what operational requirements each imposes, and where the fiduciary risk concentrates.

Private real estate funds — specifically daily-valued or interval-fund structures — are the most common alternative addition to defined contribution plans. They offer diversification from public equities without the liquidity constraints of traditional private equity. The fiduciary challenge is valuation: plan sponsors must ensure the valuation methodology is independent, audited, and defensible under the 2026 documentation standard. CIT structures from managers like JP Morgan, PGIM, and Nuveen have emerged as the primary delivery vehicle because they fit into existing recordkeeping platforms.

Managed futures and liquid alternative strategies that operate within a ’40 Act mutual fund wrapper occupy a middle ground. They provide alternative return streams with daily liquidity, but they carry higher expense ratios — typically 1.2%–2.5% versus 0.03%–0.75% for a standard index fund. Under the 2026 rule’s emphasis on fee documentation, any committee adding these strategies must document why the higher cost is justified by a specific portfolio construction benefit, not just diversification in the abstract.

Private equity and hedge fund exposure through target-date fund glide paths is the newest development and the one generating the most underwriting scrutiny. The DOL’s 2022 supplemental guidance opened the door to private equity within QDIA-eligible target-date funds, but the 2026 rule raises the process documentation bar. Sponsors considering this path need an independent investment fiduciary (ERISA 3(38)) to own the allocation decision, which shifts the liability and insulates the plan committee from direct exposure.

Insurance Implications of Adding Alternatives

Fiduciary liability carriers treat alternative investments as a material change to the plan’s risk profile. From an underwriting perspective, the addition of alternatives triggers several consequences that plan sponsors should anticipate before the next renewal.

• Premium adjustment at renewal — carriers typically increase fiduciary premiums 10–20% when alternatives are added, reflecting higher litigation probability. The increase scales with the allocation percentage and the complexity of the vehicle.
• Additional underwriting questions — expect a supplemental application section asking about the selection process, the role of any outsourced fiduciary, valuation methodology, and liquidity terms. Preparing these answers in advance speeds placement.
• Higher limit recommendations — our advisors generally recommend increasing fiduciary liability limits by $1M–$2M when alternatives are introduced, because the settlement range for alternative-investment disputes runs higher than traditional excessive-fee cases.
• 3(38) fiduciary offset — if a 3(38) investment fiduciary owns the alternatives allocation decision, the carrier may reduce or waive the alternatives-specific premium surcharge because the liability transfers with the fiduciary role.

Building the Committee Record for an Alternatives Decision

The 2026 rule’s documentation requirement is especially demanding when the committee is evaluating a new asset class rather than monitoring an existing one. A first-time alternatives decision must produce a process record that demonstrates four elements.

The committee should document the portfolio construction rationale — not “we want diversification” but “our plan’s equity concentration creates sequence-of-return risk for participants within 10 years of retirement, and a 10% allocation to private real estate reduces portfolio volatility by an estimated X basis points based on the consultant’s modeling.” Specificity is what survives scrutiny.

The committee should record the vehicle selection process, including which vehicles were considered and rejected and why. If the committee chose a CIT over a mutual fund wrapper, the minutes should explain the fee, liquidity, and operational trade-offs. If the committee chose one manager over three others evaluated, the comparison matrix belongs in the meeting record.

Fee justification for alternatives requires a different analytical frame than traditional funds. The committee cannot simply compare an alternative fund’s 1.5% expense ratio against a 0.05% index fund. The comparison must be against peers in the same asset class — and the minutes should note the median and quartile positioning of the selected vehicle’s fees relative to that peer set.

Finally, the committee must document the ongoing monitoring framework before the investment is added, not after. How will performance be evaluated? What benchmark is appropriate? Under what circumstances would the allocation be reduced or eliminated? Setting these parameters in advance demonstrates the deliberate, repeatable process the 2026 rule rewards.

This is part of our complete guide to 401(k) fiduciary liability for plan sponsors.