Combination Deal with Arco Completed

BP Amoco PLC
18 April 2000

BP AMOCO COMBINATION WITH ARCO COMPLETED

BP Amoco announced today that its combination deal with Atlantic Richfield
Company (ARCO) was completed at 08.00 hours London time today (April 18).

In replacement for shares of ARCO Common Stock which ceased trading at the
close of business yesterday, BP Amoco has listed new BP Amoco securities on
the Stock Exchanges on which its shares are quoted.