Transaction in Own Shares

BP PLC
11 May 2005


BP p.l.c.  -  Transaction in Own Shares
BP p.l.c.  -  11 May 2005


BP p.l.c. announces that on 10 May 2005, it purchased 2,900,000 ordinary shares
at prices between 543.50 pence and 549.00 pence per share. The purchased shares
will all be held as Treasury shares.

Following the above purchase, BP p.l.c. holds 196,131,000  ordinary shares in
Treasury, and has  21,291,104,601 ordinary shares in issue (excluding Treasury
shares).


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


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