In today’s equity markets, share buybacks have overtaken dividends to become the primary method of returning cash to shareholders among S&P 500 companies. Once hailed as a shareholder-friendly practice, recent research—such as Byungwook Kim’s 2025 study, “Do Share Repurchases Increase the Value of Non-repurchasing Firms?”—casts a shadow on the exuberance surrounding buybacks. Despite fueling bull markets, this phenomenon may undermine both market fundamentals and long-term investor returns.

The Capital Overhang: Tracing the Buyback Surge

The scale of buybacks is staggering. In 2024 alone, S&P 500 companies bought back a record $920 billion in shares, according to S&P Dow Jones Indices. Tech giants like Apple (AAPL)—which returned over $80 billion via buybacks in the last fiscal year—lead the charge, with Microsoft, Alphabet, and Meta following suit. By some estimates, buybacks now account for more than 60% of total cash returned to shareholders in the U.S. market, eclipsing dividends for the better part of the last decade.

Why has this happened? Persistently low interest rates through the 2020s encouraged cheap corporate borrowing, allowing firms to fund both operations and aggressive buybacks. As profit margins swelled during pandemic recoveries, boards opted to repurchase shares, often in large, sustained tranches. The result is a feedback loop: fewer shares outstanding boost metrics like earnings per share, making executive compensation targets easier to hit and stock prices more attractive—at least in the short term.

The Mispricing Feedback Loop

Kim’s 2025 study points to a crucial but underexplored consequence: capital from buybacks does not simply exit the market but is typically redeployed, often into stocks with similar characteristics. For example, when tech companies repurchase shares, investors tend to reinvest proceeds into other growth-oriented stocks. This creates a mispricing loop, artificially inflating prices for firms merely adjacent to the buyback magnates—even if their fundamentals have not changed.

This mechanism distorts essential signals for all market participants. Value firms—traditionally considered undervalued based on metrics like price-to-book or price-to-earnings ratios—are left behind, while growth counterparts enjoy premium valuations disconnected from underlying profitability. Data from MSCI indices in 2025 show growth stocks in high-buyback sectors, such as information technology, now trade at price/earnings multiples well above historical norms, while value sectors like utilities and industrials remain cheap despite solid fundamentals.

The Erosion of the Value Premium

The value premium—the long-standing tendency for undervalued stocks to outperform growth stocks—has broken down since the onset of the buyback boom. In 2023 and 2024, value portfolios underperformed growth counterparts by an average of 7 percentage points per annum, according to Russell 1000 style indices. Kim’s research and similar studies suggest this may stem directly from buyback-driven flows. Value stocks in low-buyback sectors are shut out of the capital windfall, exacerbating valuation gaps and frustrating value-oriented investment strategies.

Systemic Risks and Regulatory Attention

The dominance of buybacks heightens systemic risks. Buybacks are concentrated among a handful of mega-cap firms—over 40% of total S&P 500 buybacks in 2024 originated from just 10 companies. If economic conditions sour (through a recession or a sudden credit tightening), or if new regulations curtail buybacks (as proposed under the 2022 U.S. Inflation Reduction Act’s 1% excise tax on net share buybacks), capital that would have been recycled into markets could suddenly evaporate or exit into safer assets, sparking abrupt corrections.

This overreliance on buybacks also poses risks for market breadth. A sudden halt could pull the rug out from under inflated valuations, especially for non-buyback firms indirectly buoyed by the capital flow. Regulatory scrutiny is on the rise: The SEC and lawmakers in Washington are exploring mandatory disclosure of buyback timing, rationale, and executive share sales coinciding with repurchase activity. India, for example, introduced a 20% buyback tax in 2019, sharply curbing the practice.

Socioeconomic Consequences: A Growing Divide

While buybacks can drive share prices higher, they often do so at the cost of long-term reinvestment—on average, buyback-heavy sectors invest a smaller share of free cash flow into research, capital expenditures, or worker upskilling. According to the National Bureau of Economic Research, these outflows have contributed to widening wealth inequality, rewarding shareholders and executives while leaving employees and long-term stakeholders behind. Critics argue that, particularly when funded by debt, buybacks can jeopardize corporate resilience and economic growth.

Investor Strategies: Navigating an Uncertain Landscape

1. Diversify Away from Buyback Risk: Focus on sectors like utilities, consumer staples, and industrials, which prioritize dividends and organic growth over large-scale repurchases. These areas may present value opportunities if buyback-driven growth momentum recedes.
2. Approach Growth With Caution: Tech and financial sectors appear acutely vulnerable to a buyback slowdown. Investors overweight these sectors should reassess exposure as forward valuations climb and buyback capacity diminishes with rising rates or profit normalization.
3. Monitor Policy Signals: Stay alert to global regulatory trends—higher taxes on buybacks, enhanced disclosure, or direct intervention can rapidly alter incentives and capital flows.
4. Revisit Value: ETFs tracking value indices (e.g., iShares Russell 1000 Value ETF, IWD) may stage a comeback if the buyback bubble deflates and market fundamentals reassert themselves.

Conclusion: The Reckoning Ahead

Share buybacks have, for a decade, delivered windfalls for shareholders and helped fuel a historic bull market, but the tide may be turning. With valuation distortions, rising regulatory risks, and the weakening of value-oriented investment strategies, prudent investors should tilt back toward fundamentals, diversification, and heightened scrutiny.

The cyclical boom in buybacks is at risk of becoming a victim of its own popularity. If the global macroeconomic or policy environment shifts, participants ignoring structural risks could be swept up in a correction that is both sudden and severe. In this silent tsunami, only those anchored to fundamentals will weather the storm.

Data sources: Byungwook Kim’s 2025 study, S&P Dow Jones Indices, MSCI sector indices, corporate financial filings.