Transaction in Own Shares

BP PLC
23 May 2005


BP p.l.c. - Transaction in Own Shares
BP p.l.c. - 23 May 2005

BP p.l.c. announces that on 20 May 2005, it purchased 3,500,000 ordinary shares
at prices between 543.50 pence and 548.00 pence per share. The purchased shares
will all be held as Treasury shares.

Following the above purchase, BP p.l.c. holds 223,481,000 ordinary shares in
Treasury, and has 21,264,036,463 ordinary shares in issue (excluding Treasury
shares).

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



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