"In a regulatory filing, PG&E disclosed it will file for Chapter 11 bankruptcy protection. Three of its retirement plans -- the Supplemental Retirement Savings Plan (SRSP), Supplemental Executive Retirement Plan (SERP), and Defined Contribution Executive Supplemental Retirement Plan (DC-ESRP) -- are likely to experience substantial losses and may be worthless, as participants in these plans acquire status as General Unsecured Creditors (GUC).... Over the last three months, PG&E stock has lost more than 80% of its value, causing the company's valuation to crater to $2.8 billion from a peak of more than $36 billion in 2017.... Not a single analyst or market expert predicted such a precipitous decline."