As of 31 March 2011, all pension insurance companies announced on their web sites information about the volume and structure of the investments by types of assets and securities issuers for each managed supplementary pension insurance fund. The information is disclosed in accordance with Art. 180 of the Social Insurance Code and the Requirements to the advertising and written information materials of the pension funds and of the pension insurance companies under Art. 123i, para 2 and Art. 180, para 2, Item 1 and Item  2 of the Social Insurance Code.

At 31.12.2010, the investments of all pension funds in debt instruments (bonds) were in overall 11 types of debt securities and 228 different issues, evaluated at the market value of BGN 1 761 111 030. The bonds occupied a share of 45.04% of the balance sheet assets of the universal pension funds, 41.27% of the balance sheet assets of the occupational pension funds, 41.59% of the balance sheet assets of the voluntary pension funds and 47.02% of the balance sheet assets of the voluntary pension funds under occupational schemes.

As of 31 December 2010, the investments of all pension funds in shares and other equity instruments were in overall 9 types of equity securities and 344 different issues evaluated at market value of BGN 1 055 964 344. The equity financial instruments account for 25.20%  share of the balance sheet assets of the universal pension funds, 28.23% of the balance sheet assets of the occupational pension funds, 31.20% of the balance sheet assets of the voluntary pension funds and 4.25% of the balance sheet assets of the voluntary pension funds under occupational schemes.

The data on the investments in 228 issues of debt and 344 issues of equity financial instruments at the end of 2010, in comparison with 184 issues of debt and 235 issues of equity financial instruments at the end of 2009, were indicative of the running of diversification processes in the pension funds through investments in a bigger number of issues, which if  appropriately combined had to result in reduction of the risk to the individual issuers and more optimal investment of the funds as rate of return-risk ratio.