Transaction in Own Shares

BP PLC
12 May 2006

BP p.l.c.  -  Transaction in Own Shares
BP p.l.c.  -  11 May 2006

BP p.l.c. announces that on 11 May 2006, it purchased 8,431,049 ordinary shares
at prices between 676.0 pence and 684.0 pence per share and between 1261.00
cents and 1274.83 cents per share. The purchased shares will all be held as
Treasury shares.

Following the above transactions, BP p.l.c. holds 1,506,654,664 ordinary shares
in Treasury, and has 20,186,498,642 ordinary shares in issue (excluding Treasury
shares).

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


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