Transaction in Own Shares

BP PLC
13 May 2005


BP p.l.c. - Transaction in Own Shares
BP p.l.c. - 13 May 2005

BP p.l.c. announces that on 12 May 2005, it purchased 3,450,000 ordinary shares
at prices between 534.00 pence and 541.00 pence per share. The purchased shares
will all be held as Treasury shares.

Following the above purchase, BP p.l.c. holds 204,031,000 ordinary shares in
Treasury, and has 21,283,320,521 ordinary shares in issue (excluding Treasury
shares).

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



                      This information is provided by RNS
            The company news service from the London Stock Exchange