Transaction in Own Shares

BP PLC
18 October 2005

BP p.l.c. - Transaction in Own Shares
BP p.l.c. - 18 October 2005

BP p.l.c. announces that on 17 October 2005, it purchased 2,250,000 ordinary
shares at prices between 624.00 pence and 634.50 pence per share. The purchased
shares will all be held as Treasury shares.

Following the above purchase, BP p.l.c. holds 715,366,481 ordinary shares in
Treasury, and has 20,921,146,940 ordinary shares in issue (excluding Treasury
shares).

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


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