Portfolio Update

BLACKROCK COMMODITIES INCOME INVESTMENT TRUST plc

All information is at 31 August 2012 and unaudited.

Performance at month end with net income reinvested

                        One    Three       Six      One    Three     Five
                      Month   Months    Months     Year    Years    Years
Net asset value        1.0%     6.1%    -13.0%   -10.8%    20.3%    12.2%
Share price            1.3%     3.6%    -11.9%    -9.4%    23.1%    18.8%

Sources: Datastream, BlackRock

At month end
Net asset value - capital only:     114.80p
Net asset value - cum income**:     116.09p
Share price:                        116.25p
Premium to NAV (cum income):           0.1%
Net yield:                             5.0%
Gearing - cum income:                   nil
Total assets^^:                     £108.6m
Ordinary shares in issue:        93,508,000

**Includes net revenue of 1.29p.
^^includes current year revenue.

Sector                   % Total     Country                   % Total
Analysis              Cap Assets     Analysis               Cap Assets

Integrated Oil              27.6     Global                       28.9
Exploration & Production    18.1     Canada                       23.3
Diversified                 17.8     USA                          20.0
Gold                         7.2     Asia                          8.2
Copper                       5.7     Latin America                 6.9
Oil Sands                    4.5     Europe                        6.3
Oil Services                 3.9     South Africa                  2.7
Coal                         3.1     Africa                        1.5
Iron Ore                     2.7     China                         1.5
Aluminium                    2.0     Australia                     1.3
Distribution                 2.0     Current liabilities          (0.6)
Fertilizer                   2.0                                 -----
Nickel                       1.4                                 100.0
Tin                          1.3                                 =====
Platinum                     0.7
Zinc                         0.6
Current liabilities         (0.6)
                           -----
                           100.0
                           =====

Ten Largest Equity Investments (in alphabetical order)

Company                      Region of Risk

Anadarko Petroleum              USA
BHP Billiton                    Global
Chevron                         Global
ExxonMobil                      Global
Occidental Petroleum            USA
Peyto Exploration & Development Canada
Rio Tinto                       Global
Schlumberger                    USA
Teck Resources                  Canada
Total                           Global

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

In the energy market, Brent crude made robust gains in reaching a high of
US$117.9/Bbl before ending the month at US$114.4/Bbl, a US Dollar gain of
8.1%.  The on-going unrest in Syria combined with escalating tension between
Israel and Iran provided the market with a degree of uncertainty on future oil
supply and a "risk premium" was added to the oil price.

In the mining sector, commodity performance diverged: copper was flat; iron ore
fell sharply; and precious metals were stronger.  Gold advanced 3.3% and silver
was up 8.2% over the course of the month as investors looked for ways to hedge
their portfolios against the potential inflationary impacts of any forthcoming
stimulus.  Sales of bullion coins in the US jumped by 28% during the month and
gold held in exchange-traded products hit a record level, with the total held
now only exceeded by the national reserves of the U.S. and Germany.

Continued concerns about the health of the Chinese economy weighed upon
sentiment in the mining sector during the month of August.  Manufacturing
survey data, higher levels of unsold goods and news that the five biggest banks
had seen a 27% jump in overdue loans in the first half of the year encouraged a
more bearish stance on the health of the Chinese economy.  However, this
pessimism was somewhat offset by growing expectations that central banks may
propose further stimulus in coming weeks and mounting optimism that Europe's
debt crisis may be containable.  By the end of the month, mining equities had
risen by 0.2% (in Sterling terms) and energy shares were up 1.6%.

13 September 2012

ENDS

Latest information is available by typing www.blackrock.co.uk/brci on the
internet, "BLRKINDEX" on Reuters, "BLRK" on Bloomberg or "8800" on Topic 3 (ICV
terminal).  Neither the contents of the Manager's website nor the contents of
any website accessible from hyperlinks on the Manager's website (or any other
website) is incorporated into, or forms part of, this announcement.