PG&E Corp. shares PCG, +2.09% fell 4.8% Wednesday to lead S&P 500 decliners, after a report that the California Public Utilities Commission has initiated a process to decide whether or not the company should be split up. The report by Bloomberg News said that regulators were concerned about the potential liabilities the company is facing from its exposure to recent wildfires in California that killed more than three dozen and caused billions in property damage. The company has acknowledged that one of its power lines was damaged right before the outbreak of the huge Camp Fire in northern California last month. The cause of the fires is still under investigation. The stock has fallen about 51% in 2018, while the S&P 500 SPX, +1.59% has fallen 11%.