Purpose - The study aims to test the existence of a meeting clustering effect in the Spanish StockExchange (SSE). Design/methodology/approach - This paper studies the relationship between the clustering of annual general meetings and stock returns in the SSE. A multivariate analysis is carried out in order to analyse the relationship between monthly returns and the clustering of general meetings in the SSE. Findings - The authors show that meeting clustering exists and that some months exhibit significant and positive additional returns related to the holding of ordinary or extraordinary general meetings. Research limitations/implications - The authors have explored some possible explanations for the meeting clustering effect, such as a potential link with the "Halloween" effect or the presence of higher-thannormal levels of volatility, trading volumes or investor attention. However, none of these can explain the meeting clustering effect that emerges as a new anomaly in the SSE. Practical implications - The authors have documented significant and positive abnormal returns in some months that coincide with the holding of general meetings. Therefore, the holding of ordinary and/or extraordinary meetings in some months involves the release of relevant information for investors. Originality/value - This study complements the financial literature because it is focused on the clustering ofmeetings and its effect on a stock market whose legal order is based on civil law. This fact allows us to shed new light on meeting clustering and its effect on other types of markets.