The same investors are owning your competitors

Wealth & Business · Published 18 October 2026 Swipe more like this →

In short: Imagine a world where the largest shareholders of every major airline, car manufacturer, and tech giant are actually the same few companies. This isn't a dystopian fiction; it is a defining feature of modern capital markets known as common ownership.

Simultaneous holdings by identical investors across various rival companies define common ownership. While this might seem like a conflict of interest, it has become a global phenomenon over the last few decades. A systematic analysis of 49 countries and over 60,000 publicly listed firms from 2005 to 2019 reveals that overlapping ownership (κ) more than doubled in median countries during this period.

With an average intensity nearly double that of any other nation, the United States represents a distinct exception. Large-scale asset managers—namely State Street, Vanguard, and BlackRock—primarily fuel this high level of concentration. From a mere 3% in 2005, these 'Big Three' US entities now possess majority shares in almost 40% of all public firms. While their individual stakes might be modest outside the U.S., their expansive portfolios create significant overlap in markets like the UK, Germany, and Japan.

The implications for competition are profound because this concentration is most intense among the largest firms—those in the top tercile of market capitalization have roughly three times the common ownership of median firms. This puts the trend at the heart of industries where market power is most consequential. Interestingly, research suggests that stronger antitrust enforcement and stricter merger control laws correlate with lower levels of common ownership, suggesting that competition policy itself shapes how capital markets are structured.

While common ownership doesn't automatically mean coordinated behavior between companies, it creates complex incentives. The widespread presence of these managers means their voting power could have indirect effects on firm behavior. This structural shift is largely fueled by the rise of passive index investing, where investors accumulate stakes across entire markets rather than picking individual winners.

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