Transaction in Own Shares

BP PLC
21 June 2005


BP p.l.c. - Transaction in Own Shares
BP p.l.c. - 21 June 2005

BP p.l.c. announces that on 20 June 2005, it purchased 3,240,000 ordinary shares
at prices between 588.00 pence and 594.00 pence per share. The purchased shares
will all be held as Treasury shares.

Following the above purchase, BP p.l.c. holds  289,428,000 ordinary shares in
Treasury, and has  21,200,736,967 ordinary shares in issue (excluding Treasury
shares).

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



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