Atlantic Richfield Co. added to its stake...

Atlantic Richfield Co. added to its stake in Tricentrol PLC and indicated an intent to buy the entire company. Arco, which swooped into the market and scooped up 14.6% of the oil exploration and development concern’s shares, said its further purchases brought the total stake to 14.8%, or 13.8 million shares. In addition, Arco said in a statement it was considering a full bid for Tricentrol, which also has been targeted for acquisition by Elf Aquitaine U.K.