In a new working paper,2 the same authors show that the same-month momentum effect is offset by a reversal effect in subsequent months, e.g. stocks that had the highest returns in past Januaries tend to underperform over the next February to December period. Although this reversal effect may be a bit less strong before costs, it has the benefit of involving considerably less turnover.
In our own research we have been able to replicate these results, making the strategy a potential candidate for inclusion in our models. Like with all calendar-based strategies the economic rationale is a bit of a concern. Likely suspects such as earnings announcements or dividend payments, which tend to occur in the same month every year, do not appear to be the source.
1Keloharju, Linnainmaa & Nyberg, “Return seasonalities”, Journal of Finance, Vol. 71, No. 4, pp. 1557-1590, 2016.
2Keloharju, Linnainmaa & Nyberg, “Seasonal Reversals in Expected Stock Returns”, working paper, 2018.
The information contained in the website is solely intended for professional investors. Some funds shown on this website fall outside the scope of the Dutch Act on the Financial Supervision (Wet op het financieel toezicht) and therefore do not (need to) have a license from the Authority for the Financial Markets (AFM).
The funds shown on this website may not be available in your country. Please select your country website (top right corner) to view the products that are available in your country.
Neither information nor any opinion expressed on the website constitutes a solicitation, an offer or a recommendation to buy, sell or dispose of any investment, to engage in any other transaction or to provide any investment advice or service. An investment in a Robeco product should only be made after reading the related legal documents such as management regulations, prospectuses, annual and semi-annual reports, which can be all be obtained free of charge at this website and at the Robeco offices in each country where Robeco has a presence.