Common ownership—the simultaneous ownership of equity of two competing companies by the same investor—has been rising steadily. This trend has been largely triggered by increasing institutional investor participation, including index funds owned by asset managers such as Vanguard and BlackRock. However, as highlighted by Oxera Partner, Professor Julian Franks, and Oxera Associate, Professor Vikrant Vig, the rise has been accompanied by an important debate on the potential anticompetitive effects of common ownership
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