… James X. Xiong, CFA, is a senior research consultant and Thomas M. Idzorek, CFA, is chief
investment officer and director of research at Ibbotson Associates, a Morningstar company, …

What is the relative importance of asset allocation policy versus active portfolio management
in explaining variability in performance? Considerable confusion surrounds both time-…

The authors found that the rise in popularity of index trading—assets invested in index funds
reached more than $1 trillion at the end of 2010—contributes to higher systematic equity …

This article examines the impact of environmental, social, and governance (ESG) risk on US
stocks through the lens of Sustainalytics’ ESG risk-rating measure over the past decade. …

… Idzorek, CFA, is president and global chief investment officer and James X. Xiong, CFA,
is senior research consultant at Morningstar Investment Management, Chicago. Roger G. …

The spike (S) protein of SARS-CoV-2 mediates receptor binding and cell entry and is the
dominant target of the immune system. It exhibits substantial conformational flexibility. It …

Short-term probabilistic forecasts of the trajectory of the COVID-19 pandemic in the United
States have served as a visible and important communication channel between the scientific …

Classical and behavioral finance are often seen as being at odds, but the idea of “popularity”
has been introduced as a way of reconciling the two approaches. Investors like or dislike …

Research that has led to the low-volatility anomaly in cross-sectional stocks from a similar
universe indicates that volatility is not compensated with a volatility premium. The authors find …

Altered microglial states affect neuroinflammation, neurodegeneration, and disease but
remain poorly understood. Here, we report 194,000 single-nucleus microglial transcriptomes …