Studies on the financial markets proved that not all calendar anomalies are persistent in time. Some of them experienced various types of changes, including passing from the classical form to an extended one, with an enlarged specific time interval. This paper approaches the Holiday Effect...

The passing from quiet to turbulent periods could generate significant changes on some calendar anomalies of the capital markets. This paper approaches the persistence in time on Bucharest Stock Exchange of a seasonality associated to winter days. We investigate this calendar effect for three...

Very often, the holiday effects are studied only for the first day before and for the first day after any public holiday. Beside these traditional forms of the holiday effects it was revealed an extended one, which refers to the abnormal stocks returns occurring in intervals, containing some...

The classical Friday the 13th Effect refers to a calendar anomaly of financial markets which is generated by the fear of bad luck shared by the superstitious investors. As a result of their behavior, the returns from the supposed unlucky day of Friday the 13th are significant lower than those...

Empirical researches proved that many calendar anomalies of the financial markets were not persistent in time. Sometimes, the abnormal returns, detected for specific trading days, migrated to adjacent days. This paper explores the changes suffered by Friday the 13th Effect on the four indexes of...

Romanian Abstract: Aceastǎ lucrare abordeazǎ unele particularitǎţi ale evoluţiei variabilelor financiare precum: comportamentul pieţelor financiare în cursul bulelor sau crizelor, riscurile sistematice şi legǎturile dintre pieţele financiare internaţionale. Sunt prezentaţi, de...

This paper approaches the behavior of stock prices from Bucharest Stock Exchange during winter school vacations from Romania. We employed closing values of five indexes from Bucharest Stock Exchange covering the period December 2012 - January 2023. We found, for all five indexes, high abnormal...

Efficient Market Hypothesis states that financial markets react instantaneous and unbiased to new information. However, in the last decades empirical researches revealed some anomalies in investors reactions to the events that caused shocks on the financial markets. There are two main hypotheses...

The Halloween Effect is one of the main calendar anomalies used to challenge the Efficient Market Hypothesis. It consists in significant differences between the stock returns from two distinct periods of a year: November - April and October - May. In the last decades empirical researches...

The objective of the paper is to examine the possible holiday effects in the stock returns from a group of 28 countries. In our investigation we employ daily values of some representative indexes from January 2000 to December 2011. We split this sample in two sub-samples: before and during the...