This dissertation is a collection of five independent chapters that aim to better understand the investment decisions of institutional investors. The share of institutional investors that holds and trades securities has substantially increased over the past decades. Since the eighties, the share of US equities held by institutional investors has grown by more than half, from 52 percent to approximately 80 percent (Stambaugh, 2014). This increase raises three important questions. First, what are the drivers behind the investment decisions of institutional investors? Second, how do their investment decisions subsequently aect asset prices? Third, and perhaps most importantly, how do their decisions aect the investors where we ultimately care about, namely, the households?