Transaction in Own Shares

BP PLC
28 September 2005


BP p.l.c. - Transaction in Own Shares
BP p.l.c. - 28 September 2005

BP p.l.c. announces that on 27 September 2005, it purchased 6,300,000 ordinary
shares at prices between 668.00 pence and 675.00 pence per share. The purchased
shares will all be held as Treasury shares.

Following the above purchase, BP p.l.c. holds 633,970,481 ordinary shares in
Treasury, and has 21,000,464,752 ordinary shares in issue (excluding Treasury
shares).

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



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