Portfolio Update

BLACKROCK COMMODITIES INCOME INVESTMENT TRUST plc

All information is at 31 March 2014 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  0.8%    2.2%    3.1%  -5.7%  -21.7%   54.4%
Share price     -0.2%   -0.2%    5.8%  -4.7%  -20.0%   47.4%

Sources: Datastream, BlackRock

At month end
Net asset value - capital only:          106.91p
Net asset value - cum income**:          107.03p
Share price:                             109.00p
Premium to NAV (cum income):                1.8%
Net yield:                                  5.5%
Gearing - cum income:                      11.2%
Total assets^^:                          £116.7m
Ordinary shares in issue:             99,608,000
Gearing range (as a % of net assets):      0-20%

**Includes net revenue of 0.12p.
^^includes current year revenue.

Sector                       % Total              Country         % Total
Analysis                Total Assets             Analysis    Total Assets
Integrated Oil                  36.2               Global            41.0
Diversified                     21.4               Canada            22.5
Exploration & Production        14.6                  USA            19.0
Copper                           7.4               Europe             9.9 
Gold                             5.5        Latin America             7.3
Oil Sands                        5.5               Africa             4.2
Oil Services                     3.9                 Asia             3.5
Iron Ore                         3.8            Australia             2.7
Distribution                     3.0                China             1.1           
Coal                             2.6  Current liabilities           (11.2)
Nickel                           2.0
Aluminium                        1.5
Fertilizers                      1.3                                -----
Silver                           1.0                                100.0
Uranium                          1.0                                =====
Platinum                         0.5
Current liabilities            (11.2)
                               -----
                               100.0
                               =====

Ten Largest Equity Investments(in alphabetical order)

Company               Region of Risk
BHP Billiton          Global
BP                    Global
Canadian Oil Sands    Canada
Chevron               Global
Enbridge Income Fund  Canada
Exxon Mobil           Global
Rio Tinto             Global
Royal Dutch Shell     Global
Statoil               Europe
Total                 Global

Commenting on the markets, Olivia Ker and Tom Holl, representing the Investment
Manager noted:

Mixed performance in the commodity equity universe during March resulted in a
share price fall of 0.2% for the Company during the month; total return was
0.8% (with dividends reinvested). The energy sector rose moderately by 2.5% during
the month (MSCI World Energy Index) whereas the mining sector (Euromoney Global
Mining Index) fell by 1.5% (all data in £ Sterling).

In the mining sector there was quite divergent performance between the
different commodities. Most of the industrial metals fell during the month -
for example copper and zinc both fell by just over 5% - as weaker than expected
economic data from China disappointed the market and the reports of a corporate
bond default in China by a small solar company added to financing risk concerns
in China. However, there were some notably brighter areas in the mining market
with nickel prices rising by almost 8% as the Indonesian ban on exporting
nickel-bearing ore to China remains in place. The Company has exposure to
nickel via two companies that focus on the production of nickel and through its
holdings in diversified mining campanies, some of whom are significant producers of
the metal.

The month of March was a volatile one for European energy markets as the
situation in Crimea caused volatility in European gas prices given the
importance of Russian gas into the region. However, the Company has most of its
exposure in the energy sector to either global integrated producers, such as
Chevron, or North American exploration and production companies. The Company's
US gas holdings performed particularly well during the month as the Henry Hub
gas price continued to trade around $4.40/MMBtu and one of the Company's
holdings, Southwestern Energy, announced a new land acquisition. Some of the
Company's E&P holdings have been strong outperformers in the first quarter of
2014 and this presented an opportunity to write covered calls at attractive
price levels in a number of holdings.

11 April 2014

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.