Citigroup GM UK Eqty - EPT Disclosure

RNS Number:5604S
Citigroup Global Markets UK EqtyLtd
17 April 2008

DEALINGS BY CONNECTED EXEMPT PRINCIPAL TRADERS

WITHOUT RECOGNISED INTERMEDIARY STATUS, OR WITH RI STATUS

BUT NOT DEALING IN A CLIENT-SERVING CAPACITY

(Rule 38.5(b) of the Takeover Code)

1. KEY INFORMATION

Name of exempt principal trader Citigroup Global Markets UK Equity Limited

Company dealt in Rio Tinto Plc

Class of relevant security to which the Ord/Equity
dealings being disclosed relate (Note 1)

Date of dealing 16 April 2008

2. INTERESTS, SHORT POSITIONS AND RIGHTS TO SUBSCRIBE

(a) Interests and short positions (following dealing) in the class of
relevant security dealt in (Note 2)

Long Short

Number (%) Number (%)

(1) Relevant securities 0 (0.00%) 0 (0.00%)

(2) Derivatives (other than options) (0.00%) (0.00%)

(3) Options and agreements to purchase/sell 27,200 (0.00%) (0.00%)

Total 27,200 (0.00%) 0 (0.00%)

(b) Interests and short positions in relevant securities of the
company, other than the class dealt in (Note 2)

Class of relevant security: Long Short

Number (%) Number (%)

(1) Relevant securities (0.00%) (0.00%)

(2) Derivatives (other than options) (0.00%) (0.00%)

(3) Options and agreements to purchase/sell (0.00%) (0.00%)

Total (0.00%) (0.00%)

(c) Rights to subscribe (Note 2)

Class of relevant security: Details

3. DEALINGS (Note 3)

(a) Purchases and sales

Purchases Number of securities Price per unit (Note 4)
GBP (unless stated)
Total

Sales Number of securities Price per unit (Note 4)

GBP (unless stated)
50,000 60.8500
37,750 61.0500
Total 87,500

(b) Derivatives transactions (other than options)

Product name, Long/short (Note 5) Number of securities (Note 6) Price per unit (Note 4)
e.g. CFD

(c) Options transactions in respect of existing securities

(i) Writing, selling, purchasing or varying

Product name, Writing, selling, Number of securities Exercise Type, e.g. Expiry Option money
purchasing, to which the option American,
e.g. call option varying etc. relates (Note 6) price European etc. date paid/received per
unit (Note 4)

(ii) Exercising

Product name, e.g. call option Number of securities Exercise price per unit (Note 4)

(d) Other dealings (including new securities) (Note 3)

Nature of transaction (Note 7) Details Price per unit (if applicable) (Note 4)

4. OTHER INFORMATION

Agreements, arrangements or understandings relating to options or derivatives

Full details of any agreement, arrangement or understanding between the person disclosing and any other person relating
to the voting rights of any relevant securities under any option referred to on this form or relating to the voting
rights or future acquisition or disposal of any relevant securities to which any derivative referred to on this form is
referenced. If none, this should be stated.

Is a Supplemental Form 38.5(b) attached? (Note 8) YES

Date of disclosure 17 April 2008

Contact name Ciaran Lavery

Telephone number 02890 409539

Name of offeree/offeror with which connected BHP Billiton Plc

Nature of connection (Note 9) Corporate Broker/Financial Advisor

Notes

The Notes on Form 38.5(b) can be viewed on the Takeover Panel's website at
www.thetakeoverpanel.org.uk

SUPPLEMENTAL FORM 38.5(b)

DETAILS OF OPEN POSITIONS

(This form should be attached to Form 38.5(b))

OPEN POSITIONS (Note 1)

Product name, Written or Number of securities Exercise price Type, e.g. Expiry date
purchased to which the option or (Note 2) American,
e.g. call option derivative relates European etc.

Call Option Purchased 27,200 GBP 66.2900 European 29 May 2008

Notes

1. Where there are open option positions or open derivative positions (except
for CFDs), full details should be given. Full details of any existing
agreements to purchase or to sell should also be given on this form.

2. For all prices and other monetary amounts, the currency must be stated.

For details of the Code's dealing disclosure requirements, see Rule 8 and its
Notes which can be viewed on the Takeover Panel's website at
www.thetakeoverpanel.org.uk

This information is provided by RNS
The company news service from the London Stock Exchange
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