2024 Hyundai Engineering & Construction Co LtdChina State Construction Engineering Corp LtdBombardier Inc – extended observation 2023 Petrofac Ltd 2022 Leonardo SpA – termination of observationBombardier Inc 2021 Hyundai Engineering & Construction Co LtdThyssenKrupp AG 2020 PetroChina Co Ltd 2019 Petroleo Brasileiro SA 2018 JBS SA 2016 PetroChina Co LtdEni SpALeonardo SpASaipem SpA 2015 ZTE Corp. 2014 China Railway Group Ltd. 2010 Alstom SA 2007 Siemens AG
