SFBF publishes both daily historical data from the time when it took over the calculation and administration of the STIBOR benchmarks as well as periodic averages data across various periods back to 2013. The data is freely available for non-commercial use and can be accessed via the newly launched SFBF data information portal (https://swfbf.se/sfbf-benchmarks/information-portal/) area on the SFBF web site. As part of this process users need to register their details on access and can then utilise the data in support of academic/research periods as they see fit.
In addition to and for the time before SFBF took over, daily historical data is published at (https://swfbf.se/sfbf-benchmarks/previous-data/)