Transaction in Own Shares

BP PLC
20 December 2007

BP p.l.c. -  Transaction in Own Shares
BP p.l.c. -  20 December 2007

BP p.l.c. announces that on 19 December 2007, it purchased for cancellation
2,275,000 ordinary shares at prices between 600.50 pence and 608.00 pence per
share.

BP p.l.c. also announces that on 19 December 2007 it transferred to participants
in its employee share schemes 39,816 ordinary shares at prices between 350.00
pence and 500.00 pence. These shares were previously held as treasury shares.

Following the above transaction BP p.l.c. holds 1,940,659,887 ordinary shares in
Treasury, and has 18,922,087,505 ordinary shares in issue (excluding Treasury
shares).

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


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