Standard&Poor's today affirmed its triple-'B'-minus long-term local and foreign currency ratings on PTT Exploration and Production Public Co. Ltd. and revised the rating outlook to stable from negative. Standard and Poor's also affirmed its triple-'B'-minus local and foreign currency ratings on Advanced Info Service Public Co. Ltd (AIS) and revised the rating outlook of the foreign currency rating to stable from negative. The outlook of the long-term local currency rating on AIS remains at stable. The outlook changes follow Standard&Poor's outlook revision on the Kingdom of Thailand's credit ratings to stable from negative (see related press release dated May 5, 1999). Yesterday, Standard&Poor's affirmed its single-'A'-minus long-term local currency and its triple-'B'-minus long-term foreign
