Exxon, Pioneer Natural Resources

Scott Sheffield, the former CEO of Pioneer Natural Resources, is a hero of the Texas oil industry. But the U.S. government has accused him of working with OPEC to fix prices.
ExxonMobil said it completed its deal to buy Pioneer Natural Resources valued at nearly $60 billion after U.S. regulators ...
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Pioneer Natural Resources is an oil and gas exploration and production company that operates primarily in the Permian Basin in West Texas. Analyst Katherine Olexa says Pioneer is the largest pure ...