Halliburton Co. HAL, +0.66% and Baker Hughes Inc. BHI, +1.04% called off their merger, once valued at nearly $35 billion, which encountered opposition on several continents from regulators who claimed that it would hurt competition in the oil-field services business.
The deal to combine the world’s second- and third-largest oil-field services firms after Schlumberger Ltd. SLB, +0.70% appeared troubled since April 6, when the Justice Department filed a lawsuit to block it. The merger also had encountered opposition from regulators in Europe.