The Attock Oil Company Limited (AOC) was incorporated in England on December 1, 1913 and extended into Pakistan, as branch office of a foreign company for principal business of exploration, drilling and production of petroleum products.
AOC after incorporation in 1913 met its first discovery of Khaur district Attock in 1915. Thereafter, AOC has made significant contribution in promoting oil and gas exploration in the country by opening up the Potwar Basin as a new oil province. The Potwar Basin remained the only oil producing basin in Pakistan till the early 1970s. In 1978, AOC transferred its exploration, production and refining business to its subsidiaries namely Pakistan Oilfields Limited and Attock Refinery Limited respectively.