An investment portfolio's return variance is the sum of variance generated by passive systematic risk factor exposure, active security selection and active systematic risk factor timing. We show that the components of active risk can be estimated without knowledge of portfolio holdings. In a...

This paper examines the investment behavior of different financial institutions in debt securities with a particular focus on their response to price changes. For identification, we use security-level data from the German Microdatabase Securities Holdings Statistics. Our results suggest that...

This paper examines the investment behavior in debt securities across financial institutions with a particular focus on how they respond to price changes. For identification, we use security-level data from the German Microdatabase Securities Holdings Statistics. Our results suggest that banks...

We conduct a volatility decomposition to identify the source of performance differences between low volatility and high volatility mutual funds. A higher level of return covariance of fund holdings is associated with more fund-level exposure to the idiosyncratic volatility effect. Average...

This paper studies a two-person trading game in continuous time that generalizes Garivaltis (2018) to allow for stock prices that both jump and diffuse. Analogous to Bell and Cover (1988) in discrete time, the players start by choosing fair randomizations of the initial dollar, by exchanging it...

This paper extends the notion of variance optimal hedging of contingent claims under the incomplete market setting to the hedging of entire processes, and applies the results to the problem of tracking stock indices. Sufficient conditions under which this is possible are given, along with the...

I study the effects of risk and ambiguity (Knightian uncertainty) on optimal portfolios and equilibrium asset prices when investors receive information that is difficult to link to fundamentals. I show that the desire of investors to hedge ambiguity leads to portfolio inertia and excess...

We consider dynamic sublinear expectations (i.e., time-consistent coherent risk measures) whose scenario sets consist of singular measures corresponding to a general form of volatility uncertainty. We derive a càdlàg nonlinear martingale which is also the value process of a superhedging...

Superior to the variance, "swap variance (SwV)" summarizes the entire probability distribution of returns and is unbiased to distributional asymmetry. Retaining the same simplicity as mean-variance (MV) model, the efficiency of mean-swap variance (MSwV) is necessary and sufficient conditions for...

Many electricity markets exhibit an oligopolistic structure with market participants whose individual trading activities may shift prices essentially. In this context, the question of how to optimally liquidate an existing electricity futures portfolio over a fixed time horizon under the...