Affiliation:
1. Economics and Finance Department Auckland University of Technology Auckland New Zealand
2. Michael Smurfit Graduate Business School University College Dublin Dublin Ireland
3. Adelaide Business School University of Adelaide Adelaide Australia
Abstract
AbstractWe examine the mechanism by which social media sentiment affects stock prices. Specifically, we assess the impact of Twitter feeds on stock returns at the intraday level. We find that an increase in buyer‐initiated trades has a significantly positive price impact. This impact, however, is stronger with an increase in the number of tweets and sentiment, and persists even after controlling for volatility, liquidity shock, and limit‐order activity. The impact of Twitter sentiment on prices causes a lingering mispricing effect that is not fully assimilated at the intraday level. Rather, this mispricing takes several days to correct.