A proposed Department of Labor (DOL) rule now under White House review would tighten how 401(k) fiduciaries use ESG factors, signalling a return toward the narrower approach seen during Donald Trump’s first term. Unlike the Biden administration’s 2022 rule, which did not require ESG integration but clarified that fiduciaries could consider ESG factors where financially material, the new proposal points to a stricter interpretation of ERISA focused solely on pecuniary factors.

The draft guidance, titled “Prudence and Loyalty in Selecting Plan Investments and Exercising Shareholder Rights”, was submitted by the Department of Labor’s Employee Benefits Security Administration (EBSA) to the White House’s Office of Information and Regulatory Affairs (OIRA) on 30 June, suggesting publication could follow in the coming weeks.

Its submission also reflects a wider deregulatory push launched by President Trump’s February 2025 executive order, which directed federal agencies to reassess rules seen as exceeding statutory authority, relying on unlawful delegation, or raising major social, political, or economic questions without clear congressional backing.

From ESG acknowledgment to restriction

Biden’s 2022 rule mattered because it publicly acknowledged that ESG factors can be financially material. Climate risk, for example, can affect asset values, cash flows, capital expenditure, insurance costs, and long-term resilience. The rule did not compel fiduciaries to use ESG criteria. It simply confirmed that doing so could make fiduciary sense where the financial case was clear.

The proposal now under review would move back toward the position of Trumps first term, which limited fiduciaries from selecting investments based on non-financial matters such as ESG factors. In practice, that risks reintroducing the same chilling effect the 2022 rule was designed to remove.

For Minerva, the key point is that this should not be framed as a choice between fiduciary duty and ESG. The real question is whether a factor is financially material. Where it is, fiduciaries should be able to consider it and act on it, including through voting and stewardship.

Why voting rights matter

This is where the issue becomes more than a technical rule change. Fiduciary duty does not stop at portfolio construction. It also extends to the exercise of shareholder rights.

If the DOL narrows the interpretation of what counts as financially relevant, fiduciaries may come under greater pressure to justify votes against management on climate strategy, governance standards, workforce oversight, or other ESG-related issues. That matters because the 2022 framework supported the view that these topics could, in the right circumstances, be relevant to long-term value. A narrower rule makes that harder to evidence and easier to contest.

From Minerva’s perspective, that is significant. Shareholder voting is one of the main ways investors act on financially material risk. If the policy environment makes it more difficult to support dissenting votes on ESG-related grounds, the effect is not just on fund selection, but also on how ownership rights are exercised in practice.

The DOL Proposal and the Broader Anti-ESG Push

The DOL proposal should also be viewed in a wider US context. It sits alongside a broader political and regulatory backlash against ESG and DEI across federal and state institutions.

Recent examples include DOJ efforts to use fraud law as a disincentive for companies maintaining DEI policies while holding federal contracts, as well as executive scrutiny of proxy advisers alleged to promote ESG or DEI agendas. At state level, lawmakers have also tried to impose additional requirements on proxy advice that diverges from management, although some of those efforts have been blocked in court.

Taken together, these developments point to a broader attempt to narrow the space in which investors and companies can treat ESG and DEI issues as financially relevant. The common thread is not simply opposition to ESG as a label. It is a growing willingness to challenge the legitimacy of using these factors in investment analysis, stewardship, and corporate decision-making.

What the DOL Rule Means for 401(k) Fiduciaries

For 401(k) fiduciaries, the immediate task is likely to be stronger documentation. Firms will need to show more clearly why a given ESG factor affects risk-adjusted returns and how that rationale supports both investment decisions and voting decisions.

For Minerva, the principle remains straightforward. Where climate risk, governance concerns, or other ESG factors are material to long-term financial outcomes, they belong within fiduciary analysis. The 2022 rule recognised that point without making ESG mandatory. The current proposal risks narrowing that recognition and, in doing so, limiting how fiduciaries exercise both investment judgement and shareholder rights.

The practical challenge is therefore not whether ESG disappears from fiduciary decision-making. It is whether fiduciaries will still be able to treat financially material ESG risks, and vote on them accordingly, without facing a higher regulatory burden.