In recent years, the number of NGOs has been decreasing, after several years of growth. On 17 September 2012 22,490 associations, 2,324 institutes and 251 foundations were registered. On November 4, 2022, there were 27,550 NGOs, of which 23,459 were associations, 3,831 (private) institutions and 260 institutions. Not all registered NGOs are necessarily active. In accordance with the established practice, active organisations are those submitting their annual reports to AJPES, which is cca. 3 % less than the number of registered organisations. The data on active NGOs is only accessible for previous years and likely to be available each September when AJPES has processed aggregated data on submitted annual reports. In 2022, there were more than 27,500 active associations, institutes and foundations.

The data on associations also comprise data on society branches and youth councils, and data on institutes comprise data on religious communities having the humanitarian organisation status. The data exclude the associations, institutes and foundations that have been established by the Republic of Slovenia, municipalities or other public sector entities.

The number of non-governmental organisations decreased in 2023 compared to the previous year, with the number of associations decreasing by as much as 0.7 % (in 2022 it decreased by 1.03 %), the number of foundations decreasing by 0.41 % (in 2022 it increased by 2.10 %), and the number of institutions increasing by 1.78 % (it decreased by 2 % in 2022). In total the number of non-governmental organisations decreased by 0.03 % in 2023. 

The largest share by far among all non-governmental organisations is taken up by associations with 85.96 %. The smallest percentage – only 0.92 % – pertains to foundations, and there are also 13.12 % institutes. In the last fifteen years, the share that has increased the most was that of institutes, of which there were less than 7% of all NGOs in 2009.