Transaction in Own Shares

BP PLC
11 May 2006

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

BP p.l.c. announces that on 10 May 2006, it purchased 9,350,000 ordinary shares
at prices between 675.0 pence and 682.5 pence per share and between 1256.00
cents and 1270.83 cents per share. The purchased shares will all be held as
Treasury shares.

BP p.l.c. also announces that on 10 May 2006 it transferred to participants in
its employee share schemes 8775 ordinary shares at prices between 350.00 pence
and 511.00 pence. These shares were previously held as treasury shares.

Following the above transactions, BP p.l.c. holds 1,498,223,615 ordinary shares
in Treasury, and has 20,194,129,743 ordinary shares in issue (excluding Treasury
shares).

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


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