Divestment Scenarios

Divestment Scenarios: Does It Actually Change Behavior?

Divestment campaigns—organized efforts to pressure institutional investors to sell shares of specific companies or industries—have become a prominent feature of ESG advocacy. University endowments have been the most frequent targets, with student organizations demanding that institutions sell fossil fuel holdings, weapons manufacturers, private prison companies, and other objectionable businesses. Sovereign wealth funds, pension funds, and foundations have faced similar pressure.

The empirical question—does divestment actually change corporate behavior?—is distinct from the values question of whether it is appropriate to profit from objectionable activities. Both questions deserve honest examination, because campaigns are frequently advanced on the first claim (divestment changes behavior) as much as the second (investors should not profit from harm).

THE DIRECT FINANCIAL MECHANISM: SECONDARY MARKET LIMITATIONS

The most common criticism of divestment as a change mechanism is the secondary market critique: when an institutional investor sells shares of ExxonMobil, those shares are purchased by another investor on the secondary market. ExxonMobil receives no proceeds from the transaction—the company raised capital when it originally issued shares, not when those shares subsequently trade.

In the absence of a primary market capital raise, the direct financial mechanism of secondary market divestment is indirect:

Lower stock prices increase cost of equity capital: If sustained institutional selling reduces the stock price (by reducing demand), the company's market capitalization falls. This increases the cost of new equity financing (lower stock price means more shares must be issued to raise a given amount of capital). If the company plans to issue new shares—for acquisitions, capital investment, or balance sheet strengthening—this increased cost is a real financial constraint.

Borrowing costs: If ESG-motivated investors also avoid the company's bonds, the company's cost of debt capital rises as well. This effect has been observed in some cases—climate-risk-focused bond investors have demanded higher yields from fossil fuel issuers in recent years.

Analyst and rating agency attention: Divestment campaigns attract analyst and rating agency attention to ESG-related financial risks. If analysts begin downgrading the company or rating agencies flag environmental liabilities, the company's access to capital on favorable terms is affected independently of the direct selling pressure.

Empirical research: A 2020 paper by Berk and van Binsbergen in the Review of Financial Studies modeled the impact of divestment on cost of capital for large fossil fuel companies and concluded that the realistic financial impact of institutional divestment on major oil companies' cost of capital is very small—potentially a fraction of a percentage point increase that would not materially affect capital allocation decisions. The companies are large, liquid, and globally held; the divestment-motivated seller pool, while visible, is small relative to the total ownership base.

A different conclusion is reached for smaller, less liquid companies where institutional ownership is more concentrated—divestment campaigns targeting smaller companies with narrower investor bases can produce more meaningful valuation impacts.

THE SOCIAL STIGMA MECHANISM: POTENTIALLY MORE POWERFUL

The financial mechanism critique is often countered with the argument that divestment's real impact is not financial but social. Large-scale divestment campaigns produce:

Reputational pressure: Repeated public declarations from respected institutions (universities, foundations, pension funds) that they will no longer own a company or industry creates a social narrative around the industry's legitimacy. The tobacco industry's social stigma—built partly through divestment campaigns by health-focused institutions in the 1980s and 1990s—affected its relationships with advertisers, landlords, employees, regulators, and political allies in ways that outlasted any specific financial impact.

Regulatory signaling: Divestment by institutional investors signals to regulators and policymakers that sophisticated institutional capital views the industry's long-term risks as significant. This can influence regulatory action more than the underlying portfolio allocation itself.

Talent and supply chain effects: Companies with prominent negative social narratives face more difficulty recruiting top talent from elite universities, obtaining favorable supplier terms from ESG-sensitive counterparties, and maintaining relationships with business partners who are themselves subject to ESG scrutiny.

The tobacco analogy is instructive: tobacco divestment began in the 1980s; tobacco companies continued to generate strong financial returns for decades afterward. The divestment campaigns did not produce immediate corporate behavioral change or financial stress. Over a longer arc, the combination of divestment, litigation, regulation, and social stigma substantially transformed the industry's social and commercial position. Whether divestment was causal, or whether it was one element of a broader social change, is difficult to attribute.

THE ENGAGEMENT VS. DIVESTMENT DEBATE

The most intellectually serious dispute in ESG investing is whether engagement (holding shares and using them to advocate for change) or divestment (selling shares and removing the investor from the corporate relationship) is more effective at producing corporate behavioral change.

The engagement argument: You must be in the room to change anything. Shareholders who divest surrender their proxy voting rights, their standing to submit shareholder resolutions, and their ability to engage management in dialogue. Institutional investors who hold shares of fossil fuel companies but vote actively for emissions reduction targets, submit climate resolutions, and engage management in private discussion have produced documented behavioral changes—companies updating climate commitments, announcing net-zero targets, and adjusting capital allocation in response to sustained institutional pressure.

Evidence: Engine No. 1's 2021 campaign, which succeeded in electing three climate-focused directors to ExxonMobil's board with a small stake but significant coordination with other institutional shareholders, is the most prominent example of engagement changing board composition at a major fossil fuel company.

The divestment argument: Engagement requires sufficient share ownership and institutional coordination to be effective. Most individual investors and small institutions don't have the scale to engage effectively. Holding shares while change is slow or absent creates the appearance of action without the substance. Divestment is a cleaner values statement that doesn't require believing one's small holding creates meaningful leverage.

A 2021 paper by Goldstein, Kopytov, Shen, and Xiang in the Journal of Finance found evidence that engagement by large institutional investors can produce corporate ESG improvements—but the effect is concentrated in the largest institutional shareholders with significant voting power. The effect of engagement by small retail shareholders is not measurably distinguishable from zero.

This research suggests that the engagement vs. divestment debate has different answers for different actors. Large institutional investors (pension funds, sovereign wealth funds, major ESG-focused asset managers) who can credibly threaten to vote against management, coordinate with other large shareholders, and run board campaigns have demonstrated engagement effectiveness. Small individual investors who hold a few hundred shares have essentially no leverage through engagement; their choice between holding and divesting is primarily a values statement either way.

THE PORTFOLIO CONSTRUCTION IMPLICATIONS

Beyond the activist debate, divestment has financial portfolio implications:

Tracking error and performance differential: Systematically divesting an industry creates persistent deviation from market-weighted benchmarks. Over any given period, divested industries may outperform or underperform the market. The fossil fuel divestment example illustrates both possibilities: excluding oil and gas helped performance in 2015 to 2020 when energy underperformed; it hurt relative performance in 2021 to 2022 when energy surged.

Concentration risk: Divesting large sectors concentrates the remaining portfolio in sectors that weren't divested. A fund that excludes the entire fossil fuel sector has no Energy exposure—a sector that represented approximately 4% to 5% of the S&P 500 as of 2024. This isn't inherently bad, but it's a deliberate deviation from broad diversification.

Long-term expected return: If divested industries face genuine long-term structural decline—stranded asset risk for fossil fuel companies as energy transition progresses—divestment also has a financial risk management rationale. If fossil fuel companies face regulatory constraints, carbon taxes, and technological displacement that impair their long-term earnings, divesting them before these risks are fully priced may produce better long-term returns than holding them. This argument is not certain—it requires being correct about the pace of energy transition and how capital markets price this risk.

THE HONEST ASSESSMENT

Divestment's direct financial impact on targeted companies is probably small for large, liquid, globally held companies. Its social, reputational, and political effects are real but difficult to attribute causally and operate over long time horizons.

Divestment is most defensible as a values statement—a decision not to profit from activities the investor finds objectionable—rather than as a reliably effective change mechanism. The research on behavioral change suggests that sustained institutional engagement by large shareholders with genuine voting power is more likely to produce specific corporate policy changes than secondary market selling alone.

Individual investors choosing between ESG funds that apply divestment screens and conventional index funds are primarily making a values-alignment choice, not primarily a behavior-change choice. Both can be legitimate—but clarity about which goal is primary helps evaluate the trade-offs honestly.