The 2023 Alternative Data Factbook (hereinafter referred to as the Factbook) is organised by Sompo Institute Plus on behalf of the Japan Alternative Data Accelerator Association (JADAA). The Factbook was first published in 2022 to present the results of a survey of JADAA members on (i) the current use of alternative data, (ii) the future outlook of the data, and (iii) the challenges associated with the use of the data. This 2023 Factbook therefore presents the results of the second year of the survey.