What is Fiduciary Duty and ESG?

What is Fiduciary Duty and ESG?

Fiduciary duty is the legal obligation of people who manage money or make decisions for others, such as pension trustees, asset managers and company directors, to act loyally and prudently in their beneficiaries' interests. Fiduciary duty and ESG is the question of whether, and how far, those duties allow or require attention to environmental, social and governance factors.

Most of the argument turns on one distinction. An ESG factor that affects risk or return, such as a utility's wildfire liability or a supplier's labor practices, is a financial input, and weighing it is ordinary prudence. Pursuing an environmental or social goal for its own sake, at a possible cost to returns, is a different matter, and most legal systems limit it. That is why ESG integration grounded in financial materiality is widely accepted, while values-based screening and some forms of stewardship draw legal challenge.

It is distinct from the corporate purpose debate over whom directors serve, covered under stakeholder capitalism; this page focuses on investment fiduciaries.

Why It Matters

Plans covered by the U.S. Employee Retirement Income Security Act (ERISA) hold about $15 trillion in assets, according to current figures from the Labor Department's Employee Benefits Security Administration, so how their fiduciaries treat climate or labor risk moves capital across whole markets.

Internationally, the UN Environment Programme Finance Initiative and the PRI concluded in their 2019 Fiduciary Duty in the 21st Century report that fiduciary duties require investors to incorporate ESG issues into investment analysis, and declared the conceptual debate over. In the United States it is not over. About 18 states have passed laws restricting or discouraging ESG considerations by public funds, contractors or financial firms, according to Davis Polk's survey of state law, last updated in August 2026.

In Spence v. American Airlines, the first ERISA case to rule substantively on ESG, a federal court in Texas held in January 2025 that the airline breached ERISA's duty of loyalty by failing to keep its corporate interests separate from its fiduciary role while its investment manager pursued ESG initiatives through proxy voting. The court rejected the prudence claim because the airline followed prevailing industry standards, awarded no damages and imposed an injunction. In February 2026 it denied reconsideration and awarded plaintiffs' lawyers about $4.6 million in fees.

How It Works / Key Components

Two duties, two different tests

Loyalty means acting solely in beneficiaries' interests; prudence means the care and skill of a knowledgeable expert. Spence turned on loyalty rather than prudence, a reminder that whose goals are being served can matter as much as whether the analysis was sound.

Where the rules stand

The U.S. rule keeps changing

The Labor Department has written or proposed three versions in six years. A 2020 rule confined fiduciaries to "pecuniary" factors, and the 2022 rule that replaced it survived a challenge by Utah and other states in district court. In May 2025, the department told the Fifth Circuit it would write a new rule instead. Its proposal, now titled "Loyalty and the Exclusive Purpose Rule in Selecting Plan Investments and Exercising Shareholder Rights," reached the White House's regulatory review office on June 30, 2026 and was still pending in late September; the department's agenda says it would require investment and proxy decisions based only on financial considerations, not on advancing social causes.

A December 2025 executive order directed the department to revise its rules on the fiduciary status of proxy advisers, and in January 2026 the House passed H.R. 2988 to curb ESG investing in ERISA plans; the Senate has not acted on it. Across the 2020 and 2022 rules, and in the agenda's description of the new proposal, a factor that demonstrably affects risk and return remains fair game. The fights are over tie-breakers, proxy voting and how much proof a fiduciary must keep.

Council Fire's Approach

Fiduciary questions are legal questions, and they belong with counsel; our role is the evidence and process underneath the decision. For pension boards, endowments and public funds, that means establishing which environmental and social issues are financially material, then documenting the judgment through materiality assessment, climate scenario analysis and board materials that separate risk-and-return reasoning from values choices. When trustees need to know whether members share a concern, part of the UK legal test, we design the engagement that finds out. The principle that has survived every U.S. rule change is simple: if a factor affects risk and return, show the work.

Frequently Asked Questions

Is considering ESG factors a breach of the duty of loyalty?

Not in itself. Under the current ERISA rule and UK law, weighing ESG factors that bear on risk and return is part of prudent investing. Loyalty problems arise when a fiduciary serves goals other than beneficiaries' financial interests or, as the court found in Spence v. American Airlines, lets a sponsor's corporate interests mix with plan management.

Does fiduciary duty require divesting from fossil fuels?

No general rule of fiduciary law requires fossil fuel divestment; the question is whether a holding's risks and returns justify it. Some legislatures have decided for their own funds. Oregon requires state funds to divest from coal, while anti-boycott laws in other states bar financial firms that restrict fossil fuel financing from some state contracts and investments.

How should an investment committee document ESG decisions?

Record the financial case: which risk or return effect the factor has, the evidence behind it and the time horizon. Where a non-financial preference plays a role, record who authorized it and on what legal basis. Good records are the best protection in a field where U.S. rules have changed repeatedly since 2020.