Transaction in Own Shares

BP PLC
21 September 2007

BP p.l.c.  -  Transaction in Own Shares
BP p.l.c.  -  21 September 2007


BP p.l.c. announces that on 20 September 2007, it purchased for cancellation
2,530,000 ordinary shares at prices between 587.0 pence and 591.5 pence per
share.


Following the above transactions, BP p.l.c. holds 1,941,851,027 ordinary shares
in Treasury, and has 19,027,911,500 ordinary shares in issue (excluding Treasury
shares).



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


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