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This study uses Cremers and Petajisto’s (2009) method to separate active institutional investors from passive ones and shows that active investors can alleviate the anomalous comovement of stock returns. Focusing on 2 events linked to the excess comovement anomaly, Standard & Poor’s 500 Index additions and stock splits, I find that if an event stock has more active institutional investors trading in the post-event period, the anomalous comovement effect disappears. In contrast, if an event stock experiences a massive exit of active investors, this anomaly persists. The exit of active institutional investors also results in a strong price synchronicity effect.

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This paper examines whether one of the most important participants in the takeover market, the institutional investors of target companies, suffers from the disposition effect and, if so, how this selling bias influences the takeover outcomes. I report robust evidence that target institutional investors are reluctant to realize losses. This bias further allows their sunk cost to affect both the takeover price and the deal success. My results are explained by neither the undervalued targets nor the 52-week-high price effect. They are most pronounced among targets whose investors have a strong propensity to hold on to loser stocks.