Transaction in Own Shares

BP PLC
27 September 2005


BP p.l.c. - Transaction in Own Shares
BP p.l.c. - 27 September 2005

BP p.l.c. announces that on 26 September 2005, it purchased 6,000,000 ordinary
shares at prices between 655.00 pence and 663.00 pence per share. The purchased
shares will be held as Treasury shares.

Following the above purchase, BP p.l.c. holds 627,670,481 ordinary shares in
Treasury, and has 21,006,593,260 ordinary shares in issue (excluding Treasury
shares).

Enquiries: Fergus MacLeod, BP p.l.c. Tel : [phone]



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