Transaction in Own Shares

BP PLC
31 May 2005


BP p.l.c.  -  Transaction in Own Shares
BP p.l.c.  -  31 May 2005

BP p.l.c. announces that on 27 May 2005, it purchased 3,950,000 ordinary shares
at prices between 552.00 pence and 558.00 pence per share. The purchased shares
will all be held as Treasury shares.

Following the above purchase, BP p.l.c. holds 238,658,000 ordinary shares in
Treasury, and has 21,249,021,783 ordinary shares in issue (excluding Treasury
shares).

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


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