Transaction in Own Shares

BP PLC
21 March 2007


BP p.l.c. - Transaction in Own Shares
BP p.l.c. - 21 March 2007

BP p.l.c. announces that on 20 March 2007, it purchased for cancellation
3,900,000 ordinary shares at prices between 508.5 pence and 512.5 pence per
share.

Following the above transaction, BP p.l.c. holds 1,943,979,574 ordinary shares
in Treasury, and has 19,305,705,605 ordinary shares in issue (excluding Treasury
shares).

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




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