Current concerns about environmental issues have led to many new trends in technology and financial management. Within this context of digital transformation and sustainable finance, Fintech has emerged as an alternative to traditional financial institutions. This paper, through a literature review and case study approach, analyzes the relationship between Fintech and sustainability, and the different areas of collaboration between Fintech and sustainable finance, from both a theoretical and descriptive perspective, while giving specific examples of current technological platforms. Additionally, in this paper, two Fintech initiatives (Clarity AI and Pensumo) are described, as well as several proposals to improve the detection of greenwashing and other deceptive behavior by firms. The results lead to the conclusion that sustainable finance and Fintech have many aspects in common, and that Fintech can make financial businesses more sustainable overall by promoting green finance. Furthermore, this paper highlights the importance of European and global regulation, mainly from the perspective of consumer protection.

This paper explores the state of the art in the cryptocurrency literature, with a special emphasis on the links between financial dimensions and ESG features. The study uses bibliometric analysis to illustrate the history of cryptocurrency publication activity, focusing on the most popular subjects and research trends. Between 2014 and 2021, 1442 papers on cryptocurrencies were published in the Web of Science core collection, the most authoritative database, although only a tiny percentage evaluated ESG factors. One of the most common criticisms of cryptocurrencies is the pollution derived from energy consumption in their mining process and their use for illicit purposes due to the absence of effective regulation. The study allows us to suggest future research directions that may be beneficial in illustrating the environmental effect, studying financial behavior, identifying the long-term sustainability of cryptocurrencies, and evaluating their financial success. This study provides an in-depth examination of current research trends in the field of cryptocurrencies, identifying prospective future research directions.

We analyse the herding phenomenon in the management style of Spanish equity funds. Using the methodology of Lakonishok et al. (1992) Lakonishok, J. , Shleifer, A. and Vishny, R. 1992. The impact of institutional trading on stock prices. Journal of Financial Economics, 32: 23–43. [Crossref], [Web of Science ®] [Google Scholar] and Sharpe's style analysis (1992) Sharpe, W. F. 1992. Asset allocation: management style and performance measurement. Journal of Portfolio Management, 18: 7–19. [Crossref], [Web of Science ®] [Google Scholar] , we find interesting conclusions in the investment behaviour of fund managers, a barely-explored aspect, especially in the Spanish market.

Past literature shows that tests of performance persistence do not agree in the most important mutual fund markets and so there is a need for further research in other smaller countries such as Spain, one of the biggest growth fund markets in Europe in the nineties. Spanish equity funds investing in domestic stocks exhibit mixed results when performance persistence is analysed. These results were obtained from an exhaustive application of parametric and non-parametric procedures proposed in the past financial literature.