Using a novel dataset, I show that hedge fund managers connected through shared employment histories hold and trade more of the same stocks than unconnected managers. A long-short portfolio of connected-unconnected overlapped trades generates 3.6% of annual alpha. Results are greater between fund-pairs with stronger social connections and longer relationships implying a socially reinforcing channel is responsible. Shock based tests confirm social channels lead to the main findings, supporting models of manager coordination. The findings identify common sources of risk and return for employment-linked hedge funds, except during severe drawdowns when common holdings are protected from fire sales.

We introduce an estimator that measures factor exposures and alphas of individual private equity funds, with minimal assumptions about the fund return data-generating process (DGP). Simulations using varying assumptions about the DGP indicate that our estimator exhibits lower mean-squared-error (bias plus variance) than competing time-series estimators. Applying our model to a newly available commercial dataset, PitchBook, we uncover new findings of economic importance: buyout managers have higher average skill levels than claimed by past studies; portfolios are marked with forward-looking and lagged multiples of factors; and skill and systematic exposures vary significantly over time.