Transaction in Own Shares

BP PLC
18 May 2006

BP p.l.c.  -  Transaction in Own Shares
BP p.l.c.  -  18 May 2006

BP p.l.c. announces that on 17 May 2006, it purchased 8,250,000 ordinary shares
at prices between 622.0 pence and 644.5 pence per share. The purchased shares
will all be held as Treasury shares.

Following the above transactions, BP p.l.c. holds 1,534,344,164 ordinary shares
in Treasury, and has 20,159,522,211 ordinary shares in issue (excluding Treasury
shares).

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


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