Conversion of Securities

Conversion of C Shares

BlackRock Commodities Income Investment Trust plc

19 October 2010

BlackRock Commodities Income Investment Trust plc (the "Company") announces 
that the C Shares currently in issue will be converted into Ordinary Shares at 
the following rate calculated in accordance with the Company's prospectus dated
1 September 2010 (the "Prospectus"):

0.7454 Ordinary Shares for every C Share (the "Conversion Ratio")

On the basis of the Conversion Ratio, a holder of 1,000 C Shares will receive
745 Ordinary Shares in accordance with the following timetable:

Admission of new Ordinary Shares to                           2 November 2010
the Official List and to trading on                                          
the London Stock Exchange                                                    
                                                                             
Crediting of CREST accounts with new                          2 November 2010
Ordinary Shares                                                              
                                                                             
Share certificates in respect of new          week commencing 8 November 2010
Ordinary Shares expected to be                                               
despatched by                                                                


The C Shares will be delisted on 2 November 2010 and an application will be
made for 14,908,000 new Ordinary Shares to be admitted to the Official List and
to trading on the London Stock Exchange from the same date.

The new Ordinary Shares will not receive the Second Special Dividend but will
rank pari passu with the existing Ordinary Shares in all other respects from 
2 November 2010.

The C Shares will also convert, in aggregate, into 185,092,000 Deferred Shares.
The Deferred Shares will be purchased by the Company on 2 November 2010 for an
aggregate value of £0.01 per 1,000,000 Deferred Shares and automatically
cancelled.

Terms defined in the Prospectus shall have the same meaning in this
announcement.


For further information:

Blackrock Commodities Income Investment Trust plc
Jonathan Ruck Keene / Kerry Higgins
[phone]

J.P. Morgan Cazenove Limited
William Simmonds
Tel: [phone]