Pioneer Natural ResourcesNYSE: PXD

Nearly two dozen Democratic senators, led by Majority Leader Chuck Schumer, D-N.Y., wrote a letter to the Justice Department urging a probe of alleged collusion between the oil industry and OPEC.

Scott Sheffield, the former CEO of Pioneer Natural Resources, has requested the US Federal Trade Commission to vacate its order that barred his inclusion on Exxon Mobil's board.

Exxon Mobil (XOM) has finalized the purchase of Pioneer Natural Resources (PXD) in a significant oil deal. Chairman and CEO Darren Woods speaks with Yahoo Finance's Brian Sozzi and Akiko Fujita about the acquisition and the outlook for Exxon Mobil.

Vistra Corp, which is based in Texas, will be added to the S&P 500 index on Wednesday morning, according to S&P Dow Jones Indices.

According to Exxon Mobil's top shale executive, it will take approximately 1.5 to 2 years for the company to achieve the production synergies it aims for from acquiring U.S. shale oil producer Pioneer Natural Resources for $60 billion.

ExxonMobil announced on Friday that it has finalized the acquisition of Pioneer Natural Resources for almost $60 billion, following approval from U.S. regulators. With debt included, ExxonMobil is investing approximately $64.5 billion in the purchase of Pioneer.

The former CEO of Pioneer Natural Resources Corp, Scott Sheffield, has been sanctioned by the US Federal Trade Commission (FTC) and is prohibited from joining Exxon Mobil's board during its $60 billion acquisition of Pioneer. The FTC claims that Sheffield was involved in a plan with other oil executives in the US and OPEC to limit production and increase profits.

ExxonMobil has been given the green light by the Federal Trade Commission to finalize its $65 billion purchase of Pioneer Natural Resources this week.

U.S. regulators approved Exxon Mobil's $60 billion acquisition of Pioneer Natural Resources on Thursday, but prohibited Pioneer's ex-CEO from joining Exxon's board due to accusations of colluding with OPEC to increase oil prices.