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Persistence of announcement effects on the intraday volatility of stock returns: Evidence from individual data
Author(s) -
Uctum Remzi,
RenouMaissant Patricia,
Prat Georges,
LecarpentierMoyal Sylvie
Publication year - 2017
Publication title -
review of financial economics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.347
H-Index - 41
eISSN - 1873-5924
pISSN - 1058-3300
DOI - 10.1016/j.rfe.2017.03.001
Subject(s) - inefficiency , economics , volatility (finance) , equity (law) , stock (firearms) , financial economics , competitor analysis , econometrics , stock market , monetary economics , microeconomics , mechanical engineering , paleontology , management , horse , political science , law , biology , engineering
We analyze the persistence effects in the empirical relationship between announcement releases and return volatilities of four major companies of the French stock market using high frequency data over the period 1995–1999. Besides its institutional stability, this sample period avoids the econometric difficulties inherent to simultaneous news arrivals. Our approach contributes to the relevant literature in that we focus on individual stock volatilities rather than indices, we distinguish firm‐specific and macroeconomic announcements, and we endogenize both the durations of announcement effects and the response patterns of equity prices. We find that our individual volatilities are affected by a systematic market effect, calendar effects, announcements related to the firms’ macroeconomic environment and announcements related to the firms’ and their competitors’ strategic dealings and commercial outcomes. We find evidence that all volatility responses are gradual with persistence horizons ranging from one to three hours, revealing a significant degree of inefficiency of the French stock market over the period. This inefficiency can be viewed as a breeding ground for the implementation of more performant informational and trading systems that allowed markets to move towards more efficiency.