(Reuters) - Abu Dhabi state investor Mubadala sold a 4.5% stake in Oil Search Ltd for A$362.8 million ($274.82 million), the oil and gas producer said in a filing late on Thursday. Mubadala, an investor since 2008, sold 94 million shares on Tuesday, the filing showed, lowering its stake to 4.94%, below the 5% threshold to be considered a substantial shareholder in Australia. The state fund did not immediately respond to a request for comment. Mubadala, which initially bought a 17.6% stake in 2008, declined to participate in a A$1.16 billion capital raise conducted by Oil Search in April 2020. The state fund’s representative, Bakheet Al Katheeri, also stepped down from Oil Search’s board, the company said in a separate statement earlier on Thursday. Reporting by Nikhil Kurian Nainan in Bengaluru; Editing by Shounak Dasgupta Our Standards: The Thomson Reuters Trust Principles.