Share buybacks have rapidly evolved from an occasional corporate tactic into a dominant force shaping the equity markets. According to S&P Dow Jones Indices, U.S. companies on the S&P 500 alone spent over $925 billion on buybacks in 2024, surpassing dividends by a wide margin and making repurchases the primary method of returning capital to shareholders. This dramatic shift, while celebrated by many executives and shareholders for driving earnings per share (EPS) and supporting stock prices, is attracting heightened scrutiny. New research in 2025, including the influential study by Byungwook Kim, finds that widespread buybacks may be destabilizing markets, distorting valuations, and setting the stage for sharp corrections.

The Mechanics and Rise of Buybacks

Share repurchases allow companies to buy back their own stock from the open market, reducing the number of outstanding shares and typically boosting EPS. In theory, this should signal management’s confidence in the company’s future and optimize use of excess cash. However, recent trends show buybacks are often used even by firms with weakening fundamentals—sometimes funded by cheap debt, especially during low rate regimes.

Data from FactSet shows tech giants like Apple, Microsoft, Alphabet, and Meta have consistently led massive buyback programs. In the first quarter of 2025, Apple alone repurchased nearly $23 billion of its own shares, setting a record in program size and frequency. Across sectors, tech and financial services now routinely dedicate over 30% of their operating cash flow to repurchases, far outpacing more traditional mechanisms like dividends and reinvestment in core business operations.

Artificial Valuations and the Mispricing Loop

Kim’s 2025 study, “Do Share Repurchases Increase the Value of Non-repurchasing Firms?”, reveals that buyback-driven capital isn’t simply removed from the system. Instead, investors often reallocate this cash into stocks of similar companies—frequently non-buying firms in the same sector or style. This creates a feedback loop that pushes up prices across related stocks, regardless of their underlying performance or fundamentals.

The effect: valuations for both buyback and non-buyback firms can become inflated. Non-participating companies benefit from elevated capital flows, as investors, flush with cash from buyout programs, seek comparable options. This is particularly pronounced in sectors where buybacks are most aggressive, pushing even lesser-performing stocks higher in tandem.

The Collapse of the Value Premium

Historically, “value” stocks—those trading at lower price-to-earnings or price-to-book ratios—tended to outperform pricier “growth” stocks over the long run. However, since the start of the last decade, the so-called value premium has collapsed. Kim’s research links this structural shift directly to buyback activity. Growth firms, awash with cash and market confidence, conduct outsized buybacks, inflating their own valuations and dragging sector peers up with them. Meanwhile, value-oriented companies, often in capital-intensive industries like utilities or consumer staples, lag behind due to limited excess cash or regulatory barriers that make buybacks unattractive or impractical.

This dynamic has meant that high-growth, high-buyback sectors (notably technology and financials) now trade at historic premiums versus low-buyback, high-dividend sectors. In 2025, sectors like utilities allocate less than 10% of their net profits to buybacks, while tech and consumer discretionary can exceed 30-40%.

Systemic Risk: What Happens When Buybacks Slow?

The dangers of this trend are twofold. First, the growing reliance on buybacks for market support introduces a vulnerability: if the economic climate sours, regulations tighten (such as through an increase in buyback taxes or disclosure requirements, as discussed post-2019 in India and more recently in the EU), or credit becomes harder to access, companies may sharply reduce or halt repurchase programs. This would abruptly interrupt the positive capital flow dynamics that currently support elevated valuations. A sudden reversal could spark a rapid shift as investors withdraw support from non-fundamental holdings—potentially triggering a cascading correction.

Second, the concentration of buybacks in a handful of mega-cap stocks amplifies systemic risk. When buybacks slow, these market leaders are no longer the upward anchor for the indices, and the correlations built up during the buyback boom can quickly unspool in a risk-off environment. As witnessed in 2022 during heightened volatility, any pivot away from buybacks can lead to sharp, broad market drawdowns.

Broader Impacts: Inequality and Market Behavior

Critics also point to broader social and economic costs. Buybacks are often funded by taking on debt rather than investing in long-term innovation, hiring, or infrastructure. This can prioritize shareholder returns over the broader workforce and future competitiveness, contributing to income inequality. In addition, research shows that many buybacks are executed near market peaks rather than troughs—potentially providing poor timing for both companies and investors.

Investment Strategy for a Buyback-Dominated Market

Given these risks, how should investors respond?

1. Sector Reallocation: Focus on sectors with lower buyback rates but sustainable fundamentals. Utilities, industrials, and consumer staples are less likely to face buyback-driven overvaluation and may offer defensive value if market sentiment changes.
2. Valuation Vigilance: Be wary of high-growth stocks trading on excessive multiples driven by buybacks. Scrutinize the underlying business health, not just EPS growth.
3. Monitor Regulatory Landscape: Stay alert to possible policy changes on buybacks. The Biden administration’s 1% excise tax on repurchases in 2023 marks a potential global trend toward curbing excessive buybacks.
4. Contrarian Value Opportunities: Seek strong balance sheet companies in low-buyback sectors or those that prioritize reinvestment over engineering EPS growth through repurchases.

The Road Ahead

As of mid-2025, a growing consensus among academics, market analysts, and institutional investors warns that the buyback boom may be reaching its zenith. Should macroeconomic or policy headwinds trigger a slowdown, companies and investors wedded to the buyback narrative could face dramatic losses. Meanwhile, those prepared with diversified, fundamentals-based strategies stand a better chance of weathering the next market dislocation.

In sum, while buybacks remain a valuable tool under the right circumstances, their unchecked proliferation has sown hidden risks across the market. For prudent investors, vigilance and adaptability are the most valuable buybacks of all.