Transaction in Own Shares

BP PLC
17 May 2005


BP p.l.c.  -  Transaction in Own Shares
BP p.l.c.  -  17 May 2005

BP p.l.c. announces that on 16 May 2005, it purchased 2,550,000 ordinary shares
at prices between 527.50 pence and 532.00 pence per share. The purchased shares
will all be held as Treasury shares.

Following the above purchase, BP p.l.c. holds 210,131,000 ordinary shares in
Treasury, and has 21,277,292,483 ordinary shares in issue (excluding Treasury
shares).

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


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