The department filed suit April 6 to block the merger of Halliburton and Baker Hughes. It claims the transaction would unlawfully eliminate significant competition in almost two dozen markets crucial to the exploration and production of oil and natural gas in the United States.
"The companies' decision to abandon this transaction - which would have left many oilfield service markets in the hands of a duopoly is a victory for the US economy and for all Americans," Attorney General Loretta E. Lynch said in a statement on Sunday.
As part of the agreement, Halliburton will pay Baker Hughes the termination fee of USD 3.5 billion by Wednesday, according to a joint release from the companies.
"While both companies expected the proposed merger to result in compelling benefits to shareholders, customers and other stakeholders, challenges in obtaining remaining regulatory approvals and general industry conditions that severely damaged deal economics led to the conclusion that termination is the best course of action," Dave Lesar, Halliburton's chairman and CEO, said.
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Halliburton and Baker Hughes announced their plan to combine in November 2014, shortly after oil prices began to fall. Few, however, predicted the depth and duration of lower prices caused by a global oversupply of oil.
The glut slowed demand for drilling services and crushed the stock price of both companies.
The Justice Department indicated its concern about the acquisition in a lawsuit it filed against ValueAct Capital, a hedge fund that had bought more than USD 2.5 billion in stock of Halliburton and Baker Hughes.
Europe's top regulator, the European Commission, said it had also had concerns about the deal. It said that it had investigated its potential impact on competition together with regulators in the US, Brazil and Australia.