Citigroup Derivs Mkt - EPT Disclosure

* Reuters is not responsible for the content in this press release.

Thu Apr 17, 2008 8:44am EDT

RNS Number:5746S
Citigroup Derivatives Markets Inc
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 Derivatives Markets Inc
Company dealt in                               Rio Tinto plc
Class of relevant security to which the        Ordinary Shares (dealt in the form of ADRs)
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                        7,700                            33,100
                                                          (0.00%)                       (0.00%)

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

(3) Options and agreements to purchase/sell   189,600                           211,000
                                                     (0.02%)                           (0.02%)

Total                                         197,300                           244,100
                                                     (0.02%)                           (0.02%)




(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


Convertible                                    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


Purchase                              Number of securities                   Price per unit (Note 4)

                                                                             USD (unless stated)
                                                       500                                   497.26
                                                       500                                    497
                                                       500                                   500.41
                                                       100                                   497.21
                                                       100                                   495.66
                                                       100                                   495.67
                                                       100                                   495.65
                                                       100                                   493.43
Total                                 2,000


Sales                                 Number of securities                   Price per unit (Note 4)

                                                                             USD (unless stated)



 (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,         Number of        Exercise        Type, e.g.       Expiry          Option money
                 selling,         securities to                    American,
e.g. call option purchasing,      which the option Price (USD)     European etc.    Date            paid/received
                 varying etc.     relates (Note 6)                                                  per unit (USD)
(C = call;                                                                                          (Note 4)

  P = put)
       P            purchasing          500              400           AMERICAN       2008-07-19          7.6
       C            purchasing          100              470           AMERICAN       2008-05-17          44.2
       C            purchasing          100              460           AMERICAN       2008-04-19          39.8
       C             selling            -100             470           AMERICAN       2008-05-17          44.2
       C             selling            -100             490           AMERICAN       2008-04-19          11.3
       C             selling            -100             500           AMERICAN       2008-04-19          9.1
       C             selling            -100             500           AMERICAN       2008-07-19          43.3
       C             selling            -100             440           AMERICAN       2008-05-17          68.2
       C             selling            -100             500           AMERICAN       2008-04-19          5.5
       C             selling            -100             510           AMERICAN       2008-04-19          3.3
       C             selling            -100             520           AMERICAN       2008-04-19          1.9
       C             selling            -100             470           AMERICAN       2008-04-19          29.1
       C             selling            -100             500           AMERICAN       2008-05-17          23.5
       P             selling            -100             450           AMERICAN       2008-05-17           9
       C             selling            -100             520           AMERICAN       2008-04-19          0.95
       C             selling            -100             520           AMERICAN       2008-04-19          1.75
       P             selling            -100             480           AMERICAN       2008-05-17          16.4
       P             selling            -100             500           AMERICAN       2008-07-19          44.7
       C             selling            -500             480           AMERICAN       2008-04-19          19.4
       C             selling            -600             460           AMERICAN       2008-05-17          50.5
       P             selling            -900             450           AMERICAN       2008-05-17          9.8
       C             selling           -1000             510           AMERICAN       2008-04-19          1.95



(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.


None







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




Date of disclosure                                                17 April 2008

Contact name                                                      Pavla Trskova

Telephone number                                                  02890 409544

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

        C              purchased             14900               470              American           2008-07-19
        C              purchased             11700               460              American           2008-04-19
        P               written              7800                300              American           2008-07-19
        P               written              5200                350              American           2008-04-19
        C              purchased             5000                580              American           2008-07-19
        P               written              4400                410              American           2008-04-19
        C              purchased             4300                590              American           2008-07-19
        C              purchased             4000                600              American           2008-07-19
        C              purchased             3900                400              American           2008-04-19
        P               written              3800                410              American           2008-04-19
        P               written              3700                360              American           2008-04-19
        P               written              3600                370              American           2008-04-19
        C              purchased             3600                470              American           2008-04-19
        P               written              3500                410              American           2008-04-19
        P               written              3400                300              American           2008-04-19
        C              purchased             3200                500              American           2008-04-19
        C              purchased             3000                590              American           2008-04-19
        C              purchased             3000                570              American           2008-07-19
        C              purchased             2900                550              American           2008-04-19
        P               written              2700                400              American           2008-04-19
        C              purchased             2600                450              American           2008-07-19
        C              purchased             2200                370              American           2008-04-19
        P               written              2200                380              American           2008-04-19
        P               written              2000                310              American           2008-04-19
        P               written              2000                330              American           2008-04-19
        P               written              2000                340              American           2008-04-19
        P               written              2000                450              American           2008-04-19
        C              purchased             2000                570              American           2008-04-19
        C              purchased             2000                580              American           2008-04-19
        P               written              2000                370              American           2008-05-17
        P               written              2000                380              American           2008-05-17
        C              purchased             2000                440              American           2008-07-19
        C              purchased             2000                550              American           2008-07-19
        C              purchased             2000                560              American           2008-07-19
        C              purchased             2000                580              American           2008-07-19
        C              purchased             2000                420              American           2008-10-18
        P               written              1900                290              American           2008-04-19
        C              purchased             1800                440              American           2008-10-18
        C              purchased             1700                480              American           2008-04-19
        P               written              1500                300              American           2008-04-19
        C              purchased             1500                430              American           2008-04-19
        C              purchased             1400                400              American           2008-04-19
        C              purchased             1400                550              American           2008-04-19
        C              purchased             1400                360              American           2008-07-19
        P               written              1400                500              American           2008-07-19
        P               written              1300                430              American           2008-04-19
        P               written              1300                370              American           2008-05-17
        C              purchased             1200                450              American           2008-04-19
        P               written              1200                440              American           2008-10-18
        P               written              1100                490              American           2008-07-19
        C              purchased             1100                540              American           2008-07-19
        P               written              1000                260              American           2008-04-19
        C              purchased             1000                340              American           2008-04-19
        C              purchased             1000                360              American           2008-04-19
        P               written              1000                370              American           2008-04-19
        C              purchased             1000                440              American           2008-04-19
        C              purchased             1000                520              American           2008-04-19
        P               written              1000                250              American           2008-07-19
        P               written              1000                260              American           2008-07-19
        P               written              1000                290              American           2008-07-19
        P               written              1000                310              American           2008-07-19
        P               written              1000                370              American           2008-10-18
        C              purchased             1000                420              American           2008-10-18
        P               written              1000                420              American           2008-10-18
        C              purchased             1000                430              American           2008-10-18
        C              purchased             1000                450              American           2008-10-18
        C              purchased             1000                470              American           2008-10-18
        C              purchased             1000                500              American           2008-10-18
        C              purchased             1000                500              American           2008-10-18
        C              purchased              900                510              American           2008-04-19
        P               written               900                380              American           2008-05-17
        P               written               900                400              American           2008-05-17
        C              purchased              900                330              American           2008-07-19
        P               written               900                330              American           2008-07-19
        C              purchased              800                390              American           2008-04-19
        C              purchased              800                390              American           2008-04-19
        C              purchased              800                400              American           2008-04-19
        C              purchased              800                460              American           2008-10-18
        P               written               700                280              American           2008-04-19
        P               written               700                470              American           2008-04-19
        P               written               700                300              American           2008-07-19
        C              purchased              600                310              American           2008-04-19
        P               written               500                320              American           2008-04-19
        P               written               500                360              American           2008-04-19
        C              purchased              500                430              American           2008-04-19
        C              purchased              500                430              American           2008-05-17
        P               written               500                400              American           2008-07-19
        P               written               500                450              American           2008-07-19
        C              purchased              500                470              American           2008-07-19
        C              purchased              500                550              American           2008-07-19
        C              purchased              400                420              American           2008-05-17
        C              purchased              400                250              American           2008-07-19
        C              purchased              400                370              American           2008-07-19
        C              purchased              300                370              American           2008-04-19
        C              purchased              300                410              American           2008-04-19
        C              purchased              300                600              American           2008-04-19
        C              purchased              300                300              American           2008-07-19
        C              purchased              300                330              American           2008-07-19
        C              purchased              300                410              American           2008-07-19
        C              purchased              300                480              American           2008-07-19
        P               written               200                460              American           2008-05-17
        C              purchased              200                320              American           2008-07-19
        P               written               200                330              American           2008-07-19
        P               written               200                390              American           2008-07-19
        P               written               100                450              American           2008-04-19
        C              purchased              100                500              American           2008-05-17
        C              purchased              100                250              American           2008-07-19
        P               written               100                250              American           2008-07-19
        P               written               100                280              American           2008-07-19
        P               written               100                320              American           2008-07-19
        C              purchased              100                390              American           2008-07-19
        C              purchased              100                500              American           2008-07-19
        C              purchased              100                520              American           2008-07-19
        C              purchased              100                520              American           2008-07-19
        P               written               100                520              American           2008-07-19
        P               written               100                570              American           2008-07-19
        P               written               100                580              American           2008-07-19
        C               written              -100                350              American           2008-04-19
        C               written              -100                490              American           2008-04-19
        C               written              -100                530              American           2008-04-19
        C               written              -100                560              American           2008-04-19
        C               written              -100                410              American           2008-05-17
        P              purchased             -100                410              American           2008-05-17
        P              purchased             -100                440              American           2008-05-17
        P              purchased             -100                450              American           2008-05-17
        P              purchased             -100                480              American           2008-05-17
        C               written              -100                500              American           2008-05-17
        C               written              -100                320              American           2008-07-19
        C               written              -100                350              American           2008-07-19
        C               written              -100                360              American           2008-07-19
        C               written              -100                430              American           2008-07-19
        C               written              -100                440              American           2008-07-19
        P              purchased             -100                460              American           2008-07-19
        P              purchased             -100                490              American           2008-07-19
        C               written              -100                530              American           2008-07-19
        P              purchased             -100                400              American           2008-10-18
        P              purchased             -100                430              American           2008-10-18
        C               written              -200                420              American           2008-04-19
        P              purchased             -200                510              American           2008-04-19
        C               written              -200                520              American           2008-04-19
        C               written              -200                400              American           2008-05-17
        P              purchased             -200                440              American           2008-05-17
        C               written              -200                470              American           2008-05-17
        P              purchased             -200                310              American           2008-07-19
        C               written              -200                420              American           2008-07-19
        C               written              -200                460              American           2008-07-19
        P              purchased             -300                410              American           2008-05-17
        C               written              -300                420              American           2008-07-19
        P              purchased             -400                240              American           2008-04-19
        C               written              -400                380              American           2008-04-19
        P              purchased             -400                380              American           2008-04-19
        C               written              -400                590              American           2008-04-19
        C               written              -400                460              American           2008-05-17
        P              purchased             -500                350              American           2008-04-19
        C               written              -500                410              American           2008-04-19
        P              purchased             -500                510              American           2008-04-19
        C               written              -500                600              American           2008-04-19
        C               written              -500                400              American           2008-05-17
        P              purchased             -500                420              American           2008-07-19
        P              purchased             -600                390              American           2008-04-19
        C               written              -600                510              American           2008-04-19
        P              purchased             -600                400              American           2008-05-17
        C               written              -600                440              American           2008-05-17
        P              purchased             -600                380              American           2008-07-19
        P              purchased             -600                420              American           2008-07-19
        C               written              -600                450              American           2008-07-19
        C               written              -600                440              American           2008-10-18
        C               written              -700                420              American           2008-04-19
        P              purchased             -700                420              American           2008-04-19
        C               written              -700                530              American           2008-04-19
        C               written              -800                350              American           2008-04-19
        P              purchased             -900                450              American           2008-05-17
        C               written              -900                370              American           2008-07-19
        P              purchased             -900                470              American           2008-07-19
        P              purchased             -900                600              American           2008-07-19
        P              purchased             -1000               390              American           2008-04-19
        P              purchased             -1000               480              American           2008-04-19
        C               written              -1000               490              American           2008-05-17
        P              purchased             -1000               270              American           2008-07-19
        P              purchased             -1000               340              American           2008-07-19
        P              purchased             -1000               350              American           2008-07-19
        P              purchased             -1000               350              American           2008-07-19
        C               written              -1000               380              American           2008-07-19
        P              purchased             -1000               440              American           2008-07-19
        P              purchased             -1000               470              American           2008-07-19
        P              purchased             -1000               550              American           2008-07-19
        C               written              -1000               590              American           2008-07-19
        P              purchased             -1000               370              American           2008-10-18
        P              purchased             -1000               380              American           2008-10-18
        P              purchased             -1000               390              American           2008-10-18
        P              purchased             -1000               460              American           2008-10-18
        P              purchased             -1000               480              American           2008-10-18
        P              purchased             -1100               250              American           2008-04-19
        P              purchased             -1100               420              American           2008-04-19
        C               written              -1100               500              American           2008-04-19
        P              purchased             -1100               340              American           2008-07-19
        C               written              -1100               430              American           2008-07-19
        P              purchased             -1100               540              American           2008-07-19
        P              purchased             -1100               450              American           2008-10-18
        C               written              -1200               330              American           2008-04-19
        P              purchased             -1200               360              American           2008-07-19
        P              purchased             -1200               410              American           2008-07-19
        C               written              -1200               500              American           2008-07-19
        P              purchased             -1200               590              American           2008-07-19
        P              purchased             -1300               430              American           2008-04-19
        C               written              -1300               540              American           2008-04-19
        C               written              -1300               510              American           2008-07-19
        P              purchased             -1400               370              American           2008-04-19
        P              purchased             -1400               360              American           2008-07-19
        C               written              -1500               380              American           2008-04-19
        C               written              -1500               460              American           2008-04-19
        C               written              -1500               480              American           2008-04-19
        C               written              -1600               400              American           2008-07-19
        P              purchased             -1800               440              American           2008-04-19
        P              purchased             -1900               460              American           2008-04-19
        C               written              -1900               570              American           2008-04-19
        C               written              -1900               600              American           2008-07-19
        P              purchased             -2000               230              American           2008-04-19
        P              purchased             -2000               240              American           2008-04-19
        C               written              -2000               580              American           2008-04-19
        P              purchased             -2000               320              American           2008-07-19
        P              purchased             -2000               410              American           2008-07-19
        P              purchased             -2000               450              American           2008-07-19
        P              purchased             -2500               290              American           2008-04-19
        C               written              -2500               470              American           2008-04-19
        C               written              -2900               450              American           2008-04-19
        P              purchased             -3000               460              American           2008-04-19
        P              purchased             -3000               440              American           2008-07-19
        C               written              -3000               480              American           2008-07-19
        C               written              -3100               300              American           2008-07-19
        C               written              -3100               560              American           2008-07-19
        P              purchased             -3200               430              American           2008-07-19
        P              purchased             -3400               390              American           2008-04-19
        P              purchased             -3500               270              American           2008-04-19
        P              purchased             -3600               280              American           2008-04-19
        P              purchased             -3600               310              American           2008-04-19
        P              purchased             -3600               470              American           2008-04-19
        C               written              -3800               410              American           2008-07-19
        C               written              -4000               490              American           2008-04-19
        C               written              -4000               560              American           2008-04-19
        C               written              -4100               440              American           2008-04-19
        P              purchased             -4100               460              American           2008-07-19
        P              purchased             -4500               340              American           2008-04-19
        P              purchased             -4600               320              American           2008-04-19
        P              purchased             -4700               440              American           2008-04-19
        C               written              -5600               540              American           2008-04-19
        P              purchased             -6100               250              American           2008-04-19
        P              purchased             -6100               260              American           2008-04-19
        P              purchased             -6900               230              American           2008-04-19
        P              purchased             -7700               400              American           2008-04-19
        C               written             -17100               460              American           2008-07-19







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 Rules 8 and 38.5
and their 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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