On the current evidence, engagement does more than divestment to change how companies actually behave. Studies find that selling a stake typically transfers shares to a less concerned owner and leaves emissions unchanged, while sustained engagement — especially when collaborative and backed by a credible threat to vote against directors or exit — is associated with measurable corporate change. Many large owners now combine both.
When an investor objects to how a company behaves — on climate, governance, or anything else — it has two broad options. It can stay an owner and push for change (engagement), or it can sell and walk away (divestment). The debate over which does more good has run for decades. The useful answer in 2026 is no longer purely ideological: there is now a body of evidence, and it tilts toward engagement, with important caveats.
What each strategy actually is
Divestment means selling — or refusing to buy — securities in companies an investor judges unacceptable. Its logic is partly moral (don't profit from harm) and partly financial (raise the company's cost of capital until it changes or shrinks). It is clean, visible and easy to communicate to beneficiaries.
Engagement means keeping the holding and using ownership rights to press for change: private dialogue with boards, voting against directors, filing shareholder proposals, and escalating when a company will not move. It is slower, less visible, and harder to explain, but it preserves both the investor's economic exposure and its voice.
What the evidence says about divestment
The strongest single piece of evidence comes from research by Kahn, Matsusaka and Shu, published through the NBER and IZA, examining how green investors affect corporate carbon emissions. Their central finding is sobering for divestment advocates: companies reduced emissions when ownership by green funds rose, and did not change emissions when ownership by non-green funds changed. In other words, the act of one investor selling to another — the mechanism of divestment — had little direct effect on what the company did. Ownership coupled with constructive engagement was more effective than confrontational exit.
A 2024 review by Border to Coast, a large UK local-government pension pool, reached a similar conclusion: the academic literature provides more support for the impact of engagement than of divestment, and engagement is most effective when led by a knowledgeable lead investor, ideally through collaboration, with realistic asks aligned to company priorities. It also noted that domestic divestment pressure can simply re-allocate fossil-fuel financing overseas, meaning divestment without a global approach can move the problem rather than solve it.
This does not make divestment worthless. It can raise financing costs at the margin, remove the awkwardness of owning assets that conflict with a fund's mandate, and carry reputational weight. But as a lever on real-world corporate behaviour, the measured effects are modest.
What the evidence says about engagement
Engagement's track record is better but conditional. The same research literature finds that engagement works when four conditions hold: a knowledgeable lead investor drives it; it is collaborative rather than confrontational; the asks are realistic and aligned with the company's own priorities; and it is backed by a credible threat of escalation.
That last condition is the hinge. Engagement that the company can safely ignore changes little. Engagement backed by a realistic threat — a vote against the board, a public campaign, or a credible exit — gives management a reason to act. Norges Bank Investment Management's 2025 climate work shows the pattern: structured dialogue with major emitters, paired with votes against directors at 69 companies and seven filed proposals, alongside a rise in portfolio emissions covered by science-based targets from 57% to 76%.
The strategies are converging
The most important shift is that the binary framing is fading. A growing body of work — including a 2023 review in Climate Policy on the institutional investor's role in a fossil-fuel phase-out — argues that the real question is not "divest or engage" but how to sequence a wider set of tools: engagement, voting, collaborative pressure, green investment, financing-sector engagement and, where justified, divestment and litigation. Practitioners increasingly pair the two: engage hard, and hold divestment in reserve as the credible consequence of failure.
The synthesis that emerges is this. Engagement backed by a credible divestment threat is more powerful than either tool alone. Engagement with no stick is toothless; divestment with no prior dialogue gives the company no chance to change and simply passes the asset to a less concerned owner.
What this means for a universal owner
For a fund that owns the whole market, the calculus is clearer than for a values-driven retail investor. Selling one emitter does nothing to reduce the universal owner's exposure to climate risk, because that risk is systemic and reappears across the portfolio. The rational strategy is to engage — individually and collaboratively — to reduce the real-world problem, while reserving divestment for cases where engagement has demonstrably failed or where a holding cannot be reconciled with the fund's mandate.
The ownable insight: divestment feels decisive and engagement feels slow, but the evidence rewards the patient owner who stays at the table with a credible willingness to leave it.
When divestment is still the right call
None of this means divestment is never warranted. There are clear cases where exit, not engagement, is the correct fiduciary and practical choice. The first is when engagement has genuinely been tried and failed: a multi-year dialogue with defined asks, escalation through votes, and no movement leaves little reason to keep pretending influence exists. The second is mandate conflict — a holding that simply cannot be reconciled with the fund's stated investment beliefs, ethical exclusions, or the terms on which beneficiaries entrusted their money. Many funds maintain narrow exclusion lists, for example on controversial weapons or severe norm violations, precisely for this reason.
The third case is unmanageable risk: a position whose downside the fund judges it cannot adequately hedge or be compensated for, regardless of dialogue. Here divestment is risk management, not protest. The discipline is to be honest about which case applies. Divestment dressed up as engagement's substitute — selling because it is easier to explain than a years-long campaign — forfeits influence for the appearance of decisiveness.
A practical decision framework
For a long-horizon owner, the sequence that the evidence supports is roughly this. Start from ownership and voting, which cost little and apply across the whole portfolio. Escalate to direct engagement on the holdings where exposure and materiality are highest, with explicit objectives and timelines. Where a single voice is too small, join or lead a collaborative engagement to build leverage. Hold divestment in reserve as the credible consequence of failure, and use it decisively when engagement has demonstrably run its course or a holding breaches the fund's mandate. Throughout, document the reasoning — because a fiduciary's choice between staying and selling has to be defensible as a financial judgement, not a reflex in either direction.