Executive Summary
The Department of Labor proposed a rule on March 30, 2026 that would create a safe harbor for 401(k) plan fiduciaries to include private equity in retirement plans. The 401(k) system holds $10.1 trillion in assets with effectively zero PE allocation today. A 1% allocation means $101 billion. Five percent means $505 billion. PwC estimates a 5% shift could unlock over $1 trillion in new alternatives AUM by 2030. The comment period closes June 1, 2026, with a final rule expected by late 2026 or early 2027. This article breaks down what the rule actually says, who benefits, how PE would structurally enter retirement plans, what the international precedents show, and what fund managers should be doing right now.
The Rule: What the DOL Actually Proposed
The proposed rule is titled "Fiduciary Duties in Selecting Designated Investment Alternatives." It was published in the Federal Register on March 31, 2026, by the Employee Benefits Security Administration. It followed Executive Order 14330, signed by President Trump on August 7, 2025, titled "Democratizing Access to Alternative Assets for 401(k) Investors."
The rule does not mandate PE in retirement plans. It creates a process-based safe harbor. Plan fiduciaries who evaluate investment alternatives against six specific factors receive a rebuttable presumption of prudence under ERISA. Those six factors: performance (risk-adjusted, net of fees), fee reasonableness versus comparable alternatives, liquidity terms, valuation methodology, performance benchmarks, and complexity.
The rule is deliberately asset-neutral. It does not single out private equity or any other asset class. It covers PE, private credit, real estate, digital assets, commodities, infrastructure, and lifetime income strategies. Deputy Secretary Keith Sonderling put it plainly: "The department's days of picking winners and losers are over."
This matters because the primary barrier to PE in 401(k) plans was never a legal prohibition. ERISA never banned it. The barrier was litigation risk. Plan sponsors faced the threat of fiduciary breach lawsuits if they offered alternatives that underperformed or charged higher fees. Over 500 fee-related ERISA lawsuits have been filed since 2016, resulting in more than $1 billion in settlements since 2020. That litigation environment made it irrational for any plan sponsor to include PE, regardless of the potential return benefit.
The safe harbor changes that calculus. A fiduciary who follows the six-factor process can defend against breach claims with a presumption of prudence. The American Benefits Council called it a step toward "curbing baseless litigation against plan sponsors." ERISA Industry Committee (ERIC) called it "a meaningful and important step" bringing "needed clarity and certainty."
The comment period runs 60 days, closing June 1, 2026. After that, the DOL can modify, withdraw, or finalize. Optimistic timeline puts a final rule by late 2026, with implementation in 2027.
The Math: $10.1 Trillion and What 1% Means
The numbers are straightforward and the numbers are large.
Total 401(k) assets as of December 2025: $10.1 trillion. Total defined contribution plan assets including 403(b) and 457 plans: $14.2 trillion. Approximately 70 million Americans actively participate in 401(k) plans. The average balance sits at roughly $146,000 according to Fidelity data.
Current PE allocation in these plans: effectively zero.
For context, state and local pension funds already average 33% of their portfolios in alternative investments. The Canadian Pension Plan Investment Board allocates 23% to PE across its C$714 billion portfolio. Australian superannuation funds average 5% in PE. The U.S. defined contribution market is the last major pool of institutional capital with no meaningful private markets exposure.
A 1% allocation across 401(k) assets means $101 billion flowing into PE. Three percent means $303 billion. Five percent means $505 billion. PwC projects that a 5% allocation to alternatives across all DC plans could unlock over $1 trillion in new AUM by 2030, generating $7 to $19 billion in annual revenue for the alternatives industry.
These projections are not speculative. They reflect what has already happened in defined benefit plans and sovereign wealth funds globally. The question is not whether capital will move. The question is how fast, and to whom.
Target-date funds are the vehicle. TDFs hold $4.8 trillion in assets, represent 31% of total DC balances, and receive 43% of all new contributions. They are the default investment option in most 401(k) plans. When PE enters retirement plans, it will enter through TDFs, not as a standalone investment option. Vanguard research indicates that a 10 to 20% PE allocation within TDFs could improve retirement wealth by 7 to 22% and retirement income by 5 to 15% after fees over a 40-year horizon. BlackRock estimates PE exposure in TDFs could generate approximately 15% more wealth over 40 years.
Who Wins: Mega-Funds vs. Emerging Managers
Not everyone benefits equally from a $10 trillion opportunity. The structural reality of how PE enters 401(k) plans will determine which managers capture that capital and which watch it flow past them.
The firms already positioned are the ones you would expect. Empower, the second-largest U.S. retirement plan recordkeeper, announced partnerships with seven PE firms in May 2025: Apollo, Franklin Templeton, Goldman Sachs Asset Management, Neuberger Berman, PIMCO, Partners Group, and Sagard. Blackstone joined in January 2026. By November 2025, over 200 plan sponsors on the Empower platform had adopted private markets options, with fees running 1% to 1.6% of assets and allocations capped at roughly 10% of a participant's portfolio.
Apollo and State Street launched target-date fund CITs structured with 90% low-cost index funds and a 10% private sleeve managed by Apollo via an evergreen fund with daily-valued exposure. Capital Group and KKR expanded their strategic partnership, filing for a hybrid public-private equity fund targeting 60% public equities and 40% PE, with an 84 basis point expense ratio. Neuberger Berman launched a TDF with a Fortune 500 company in 2024 that includes a PE co-investment sleeve.
These are the first movers. They are all large.
The concentration dynamics already reshaping PE fundraising will amplify here. In 2025, the top 10 largest PE funds captured 45.7% of all capital raised, up from 34.5% in 2024. That is the highest concentration on record. Mega-funds raising $5 billion or more took 43.7% of capital while representing just 3.5% of fund count. Only 48 first-time funds closed in 2025 and early 2026, the lowest since 2010.
A $200 million emerging manager cannot build the daily valuation infrastructure, the recordkeeper integrations, or the CIT wrapper that 401(k) access requires. Not alone. But there are paths. Sub-advisory relationships with larger platforms. Seeding arrangements with firms like Pantheon or HarbourVest, which already manage over $2 billion in DC-plan PE assets globally. Co-investment sleeves within existing TDF structures. These routes exist, but they require infrastructure, relationships, and institutional credibility that many Fund I and Fund II managers have not built.
The irony is sharp. Fund I managers outperform mega-funds across every major return metric. Yet 401(k) capital will flow overwhelmingly to the largest managers first because they are the only ones with the operational plumbing to receive it.
How PE Gets Into a 401(k): The Structural Reality
Private equity does not simply appear in a participant's account the way an S&P 500 index fund does. The structural challenges are real, and understanding them matters for any GP considering this market.
The primary vehicle is the Collective Investment Trust. CITs are tax-exempt pooled vehicles maintained by a bank or trust company, exclusively for ERISA-qualified plans. They are exempt from 1940 Act registration under Section 3(c)(11), which means lower compliance costs than mutual funds. CITs can be daily-priced with unitized interests and periodic liquidity windows. Their market share in 401(k) plans grew from 30% at the end of 2019 to 38% by year-end 2023.
Interval funds and tender offer funds provide alternative structures. Interval funds are SEC-registered and commit to repurchasing 5 to 25% of shares quarterly. Tender offer funds offer discretionary repurchases with monthly or quarterly NAV calculations. Both provide more liquidity than traditional closed-end PE but less than daily-traded mutual funds.
The liquidity sleeve concept addresses the fundamental tension between illiquid PE and the daily liquidity that 401(k) participants expect for rollovers, hardship withdrawals, and rebalancing. The approach: keep 80 to 90% of a fund in liquid public securities and 10 to 20% in private equity. Participant transactions are fulfilled by netting inflows and outflows against the liquid sleeve. Morningstar notes that PE requires higher liquid buffers than private credit due to larger drawdown risk.
Daily valuation of illiquid assets remains the core technical challenge. PE investments have no observable market prices. ERISA requires annual fair market value reporting, but daily-priced CITs need daily NAV calculations. The solution requires sophisticated valuation models, third-party appraisals, and tolerance for estimates that will never match the precision of public market pricing.
Fee structure is the other friction point. The average 401(k) mutual fund charges 36 basis points for equities and 30 for bonds. Traditional PE charges 2% management plus 20% carry. An Oxford study by Ludovic Phalippou found that true PE fees, including hidden costs, reach approximately 600 basis points annually. DC-accessible PE is being structured at 1 to 1.6% management fees, generally without carry, to fit within the fee-conscious retirement plan ecosystem. But critics argue that even a 15% PE allocation within a TDF adds roughly 90 basis points of annual drag, which could reduce lifetime wealth by 20 to 25%.
International Precedent: Australia, Canada, and the UK
The United States is not the first country to put private equity into retirement savings. Three markets offer instructive precedent.
Australia's superannuation system manages over A$4 trillion in retirement assets for a population of 26 million. APRA-regulated super funds allocate approximately 5% to PE, 8% to infrastructure, and 18% to total unlisted assets. AustralianSuper, the country's largest fund, holds 5.3% in PE within its balanced option and has reported PE returns of 10% over five years and 12% over ten. Private market assets in Australian super grew 34% in two years, reaching A$400 billion. The system works because it was built for scale: large pooled funds with professional management, long time horizons, and the infrastructure to handle illiquid assets.
Canada's public pension funds are the global benchmark for institutional PE investment. The Canada Pension Plan Investment Board manages C$714 billion for 22 million Canadians, with 23 to 24% allocated to PE, totaling C$144 billion. The Ontario Teachers' Pension Plan holds C$266 billion in assets and conducts 75% of its PE investments directly, reporting 12.4% five-year PE returns. Canadian public sector pension funds collectively maintain approximately 22% in PE. The "Maple Eight" (Canada's eight largest pensions) hold over C$400 billion in PE, roughly 20% of total assets.
The United Kingdom is moving toward DC plan alternatives, though more slowly. The Mansion House Compact of July 2023 saw 11 of the UK's largest DC providers commit to allocating at least 5% of default funds to unlisted equities by 2030. Progress has been slow: exposure grew from 0.36% to just 0.6% between the announcement and February 2025. The government escalated with the Mansion House Accord in May 2025, where 17 providers committed to 10% in private markets by 2030, with at least 5% in UK-based private markets. The goal: unlock up to 50 to 74 billion GBP.
The pattern across all three markets: PE in retirement plans works at scale, with professional management, within diversified vehicles, and with fee structures adjusted for the retail context. It does not work when 401(k) participants are picking PE funds from a dropdown menu.
The Opposition: Fees, Complexity, and Political Risk
Not everyone thinks this is a good idea.
Senator Elizabeth Warren has been the most vocal critic. In a July 2025 letter to Empower, she challenged the firm to explain "how efforts to invest retirement savings in private funds, which often yield returns on-par with the public market while charging exorbitant fees, will help individuals build lasting financial security." After the March 2026 proposed rule, she called it a plan to "stick all of these risky assets into Americans' 401(k)s" so that "Trump's Wall Street buddies have another pile of cash to play with."
Americans for Financial Reform called it "a dangerous rule" that would steer workers into "risky, opaque, high-fee" investments. The organization's senior policy analyst said PE firms are "eager to dump overvalued assets onto retirement savers as well-heeled investors snub these dubious assets and head for the exits."
The Private Equity Stakeholders Project opposes the safe harbor specifically because it could weaken fiduciary protections. Executive Director Jim Baker: "Private equity firms should not get a free pass to loot workers' 401K retirement savings."
The Consumer Federation of America has warned since 2020 that PE is "likely to saddle middle-class retirement savers with high costs and lock them into unnecessarily complex investments that underperform publicly available alternatives."
The fee critique has academic backing. Phalippou's 2020 Oxford study found that after accounting for all costs, PE net returns roughly matched public market equivalents over long periods. If that holds, critics argue, why introduce illiquidity, complexity, and higher fees for comparable performance? The counterargument: those studies cover historical PE allocation by sophisticated institutional investors. Retail access through diversified vehicles with lower fee structures may produce different outcomes.
The Enron cautionary tale still resonates in retirement policy circles. Employees concentrated their 401(k) savings in company stock, were prohibited from selling until age 50, and lost 94% when the company collapsed. The parallel is imperfect but politically useful: concentrated, illiquid, complex investments in retirement plans carry real risks for unsophisticated participants.
What Could Kill the Rule
The DOL's track record with major retirement rules is not encouraging.
The 2016 fiduciary rule took approximately six years from proposal to implementation. The Fifth Circuit Court of Appeals vacated it in March 2018, finding the DOL had exceeded its authority under ERISA. The Biden administration's 2024 "Retirement Security Rule" was blocked by two federal district courts in July 2024 and effectively vacated by March 2026.
This proposed rule was designed to avoid those vulnerabilities. The process-based safe harbor is narrower than the 2016 fiduciary rule's attempt to redefine investment advice. It does not rewrite fiduciary standards. It provides a framework for how existing standards apply to alternative investments. But legal experts still question whether the "significant deference" intended by the safe harbor would survive judicial review, since ERISA does not explicitly provide for such deference.
The Congressional Review Act presents another risk. If Congress flips in a future election, the new majority could overturn the final rule within 60 legislative days. This has not been raised prominently in current discourse, but it is a structural vulnerability for any rule finalized late in an administration.
State-level regulatory action adds another layer. Individual states could impose their own restrictions on PE in retirement plans, creating a patchwork that makes national implementation more complex for plan sponsors and recordkeepers.
The most likely scenario: the rule is finalized in late 2026 or early 2027, faces at least one legal challenge (probably in the Fifth Circuit), and survives in modified form. But "most likely" is not "certain." Any GP building a strategy around 401(k) capital needs to model both outcomes.
What Fund Managers Should Do Now
The comment period closes June 1, 2026. A final rule could come by late 2026. Capital will not flow immediately after finalization. Recordkeepers need implementation time. Plan sponsors need fiduciary process documentation. TDF providers need to build or integrate PE sleeves. Realistically, meaningful capital flow begins 18 to 24 months after finalization, which means 2028 or 2029.
That window is the preparation period. Here is what it means for different fund sizes.
For mega-funds ($5 billion and above): you are already positioned. Blackstone, KKR, Apollo, and the other first movers have the recordkeeper partnerships, the CIT infrastructure, and the brand recognition. The question is execution speed, not access. Capital Group and KKR's hybrid fund at 84 basis points sets the pricing benchmark. Expect fee compression across the board.
For mid-market managers ($500 million to $5 billion): the path runs through partnerships. Sub-advisory relationships with TDF providers, seeding arrangements with platforms like Pantheon or HarbourVest, co-investment vehicles structured specifically for DC plan access. Start those conversations now. The managers who have institutional relationships with recordkeepers by the time capital flows will capture it. The ones who start in 2028 will be two years behind.
For emerging managers (under $500 million): direct 401(k) access is unlikely in the near term. The operational, compliance, and infrastructure requirements are prohibitive for small funds. But the indirect effects matter. As mega-funds shift resources toward DC plan products, their attention and personnel shift away from traditional LP fundraising. That creates openings in the institutional LP market for differentiated smaller managers. The capital that does not flow into 401(k) products still needs to go somewhere.
For all managers: the DPI narrative matters more in this context than in any other. A regulatory environment that opens retirement savings to PE will face intense public scrutiny on returns. Every underperforming fund, every opaque fee structure, every unreturned dollar will become ammunition for the rule's opponents. The 32,000 unsold PE-backed companies worth $3.8 trillion sitting on balance sheets are not just an industry problem. They are a political vulnerability. Managers who can demonstrate real distributions, transparent fees, and genuine value creation will be positioned for the new capital. Managers who cannot will find themselves cited in the next Elizabeth Warren letter.