Transaction in Own Shares

BP PLC
15 May 2006

BP p.l.c.  -  Transaction in Own Shares
BP p.l.c.  -  15 May 2006

BP p.l.c. announces that on 12 May 2006, it purchased 6,385,000 ordinary shares
at prices between 660.0 pence and 670.5 pence per share. The purchased shares
will all be held as Treasury shares.

Following the above transactions, BP p.l.c. holds 1,513,039,664 ordinary shares
in Treasury, and has 20,180,353,737 ordinary shares in issue (excluding Treasury
shares).

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


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