Finance

Business

Archaeology

Stock (firearms)

Public information

History

Private information retrieval

Financial economics

News analytics

Political science

Econometrics

Economics

Public relations

Computer science

Systematic risk

Computer security

Volatility (finance)

Review of Financial Studies

What moves stock prices? Prior literature concludes that the revelation of private information through trading, and not public news, is the primary driver. We revisit the question by using textual analysis to identify fundamental information in news. We find that this information accounts for 49.6% of overnight idiosyncratic volatility (vs. 12.4% during trading hours), with a considerable fraction due to days with multiple news types. We use our measure of public information arrival to reinvestigate two important contributions in the literature related to individual |$R^{2}$|s of stock returns on aggregate factors. Received February 24, 2016; editorial decision May 19, 2018 by Editor Andrew Karolyi.

Information, Trading, and Volatility: Evidence from Firm-Specific News