Transaction in Own Shares

BP PLC
31 May 2007


BP p.l.c. - Transaction in Own Shares
BP p.l.c. - 31 May 2007

BP p.l.c. announces that on 30 May 2007, it purchased for cancellation 3,150,000
ordinary shares at prices between 560.0 pence and 565.5 pence per share.

BP p.l.c. also announces that on 30 May 2007 it transferred to participants in
its employee share schemes 11,755 ordinary shares at prices between 326.0 pence
and 500.0 pence. These shares were previously held as treasury shares.

Following the above transactions, BP p.l.c. holds 1,943,877,092 ordinary shares
in Treasury, and has 19,173,566,957 ordinary shares in issue (excluding Treasury
shares).

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



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