Portfolio Update

BLACKROCK COMMODITIES INCOME INVESTMENT TRUST plc

All information is at 31 March 2013 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    -1.9%    2.7%    2.8%   0.0% -0.1%  -2.3%
Share price         0.6%    3.9%    3.1%  -2.2% -2.0%   0.2%

Sources: Datastream, BlackRock

At month end
Net asset value - capital only:      120.01p
Net asset value - cum income:        120.01p
Share price:                         121.00p
Premium to NAV (cum income):            0.9%
Net yield:                              4.9%
Gearing range (as a % of net assets):  0-20%
Net gearing including income:           5.6%
Total assets^^:                      £119.4m
Ordinary shares in issue:         94,258,000

^^includes current year revenue.

Sector                % Total         Country         % Total
Analysis           Cap Assets        Analysis      Cap Assets
Integrated Oil           31.4        Global              33.9
Diversified              17.7        Canada              22.3
Explortion & Production  15.4        USA                 18.7
Copper                    8.2        Latin America       10.0       
Gold                      8.0        Europe               6.2
Oil Services              5.5        Asia                 5.9
Oil Sands                 3.0        Australia            1.7
Iron Ore                  2.6        South Africa         1.4
Aluminium                 2.3        China                1.0
Distribution              2.1        Russia               0.5
Nickel                    1.3        Africa               0.4
Tin                       1.2        Current liabilities (2.0)
Fertilizer                1.2                            -----
Coal                      1.0                           100.0
Platinum                  0.6                            =====
Zinc                      0.5
Current liabilities      (2.0)
                         -----
                        100.0
                         =====

Ten Largest Equity Investments(in alphabetical order)

Company               Region of Risk

Anadarko Petroleum    USA
Antofagasta           Latin America
BHP Billiton          Global
BP                    Global
Chevron               Global
ExxonMobil            Global
Freeport-McMoran      Asia
Rio Tinto             Global
Teck Resources        Canada
Total                 Global

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

The Eurozone Sovereign crisis threatened to resurface in March after the
inconclusive Italian elections and news of a controversial bailout of Cyprus.
In a trying month for the Eurozone's third largest economy, Fitch, the ratings
agency, also downgraded Italy's credit rating and retained their negative
outlook on the country. Cyprus found itself the subject of media headlines and
much political debate when it was announced the country would be requiring a
bailout. The final agreement settled on a €10 billion injection. In return,
however, one of the country's banks will have to be wound down and major losses
have been imposed on the largest depositors in another. The US continued to
provide investors with a beacon of hope in the form of some strong economic
data.

In the energy sector, Brent crude declined 4.3% to finish the month at US$107.4
/Bbl. Meanwhile, West Texas Intermediate, buoyed by the relative strength of
the US economy, appreciated 5.7% to US$97.2/Bbl, narrowing the longstanding
discount between the North American crude and international blends. Natural gas
prices were the outperformers, with Henry Hub gaining 15.8% to close the month
at US$4.03/MMBTU. Cold weather in the US was the primary driver, but it is also
worth noting that the number of rigs drilling for gas in the US was standing at
a 7-year low by the end of March.

In energy equity markets, it was a good month for Anadarko. The US E&P company
announced back-to-back discoveries in the Gulf of Mexico of a magnitude that
exceeded market expectations for the basin. The stock also benefitted from the
read across from ENI's announcement that it had secured a farm down agreement
for a stake in its Mozambique gas discovery. ENI and Anadarko are the leading
energy companies operating offshore Mozambique. The MSCI World Energy Index
finished the month up 0.8% (in Sterling terms).

In the mining sector, precious metals outperformed the majority of base metals
and bulk commodities in March. The MG Base Metal Price Index fell 4.0%, while
gold prices rose 0.8% to US$1,595/oz. Iron ore prices fell 9.5% to US$137.5/t
(source: CLSA). In corporate news, the merger between Glencore and Xstrata has
been delayed until early May as the company awaits regulatory approval from the
Chinese government. The HSBC Global Mining Index fell 6.5% (in Sterling terms).

All data sourced from Datastream and quoted in US Dollars unless otherwise
stated.

22 April 2013

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.