Portfolio Update

BLACKROCK COMMODITIES INCOME INVESTMENT TRUST PLC

All information is at 31 July 2010 and unaudited.

At month end                                                                   
Net asset value - capital only:                    121.17p                     
Net asset value - cum income**:                    122.20p                     
Share price:                                       124.25p                     
Premium to NAV (capital only):                        2.5%                     
Gearing - cum income:                                 4.3%                     
Revenue per share:                                   1.03p                     
Total assets^:                                       £96.51m                   
Ordinary shares in issue:                       75,600,000                     

**Includes net revenue of 1.03p.
^includes current year revenue.

                          % of Total                                 % of Total
Sector Analysis               Assets       Country Analysis              Assets
                                                                               
Integrated Oil                  26.2       Global                          20.4
Diversified                     17.9       USA                             19.2
Exploration & Production        13.7       Canada                          15.9
Copper                           9.2       Europe                          12.7
Oil Services                     6.0       Asia                            12.0
Coal                             4.8       Latin America                    8.8
Fertiliser                       4.1       South Africa                     6.2
Iron Ore                         3.7       Australia                        2.9
Gold                             3.0       China                            1.5
Aluminium                        3.0       Africa                           1.0
Platinum                         2.5       Russia                           0.7
Nickel                           2.3       Current liabilities             (1.3)
Zinc                             2.1                                      -----
Tin                              1.5                                      100.0
Distribution                     1.3                                      =====
Current liabilities             (1.3)                                           
                               -----                                           
                               100.0                                           
                               =====                                           

Ten Largest Equity Investments (in alphabetical order)                         
                                                                               
Company                                   Region of Risk                       
                                                                               
Anadarko Petroleum                        USA                                  
BHP Billiton                              Global                               
Exxon Mobil                               Global                               
Freeport-McMoRan                          Asia                                 
Kumba Iron Ore                            South Africa                         
Niko Resources                            Asia                                 
Occidental Petroleum                      USA                                  
Rio Tinto                                 Global                               
Statoil                                   Europe                               
Vale                                      Latin America                        

Commenting on the markets, Richard Davis, representing the Investment Manager
noted:

Commodity markets performed well in July, with mining and energy shares gaining
3.8% and 4.5% respectively, as data released during the month was generally
positive in terms of the outlook for the global economy. Base metals bounced
firmly off their June lows, with copper rising back above the US$3/lb to a
close of US$3.30/lb, its highest level since early May. Of note was the
drawdown in LME metal inventories during the month. Gold prices slipped back
below the US$1,200/oz level as investors took profits. In the energy sector,
oil prices moved higher to close at US$79/Bbl. BP remains on course to "kill"
the leaking Macondo well in early August.

Latest information is available by typing www.blackrock.co.uk/its on the
internet, "BLRKINDEX" on Reuters, "BLRK" on Bloomberg or "8800" on Topic 3 (ICV
terminal).

5 August 2010