Here's a look at what you need to know about Enron.
Before its collapse, Enron marketed electricity and natural gas, delivered energy and other physical commodities, and provided financial and risk management services to customers around the world.
Facts: Most of the top executives were tried for fraud after it is revealed in November 2001 that Enron's earnings have been overstated by several hundred million dollars.
Enron was once ranked the 6th largest energy company in the world.
Enron shares were worth $90.75 at their peak in August 2000 and dropped to $0.67 in January 2002.
Top Enron executives sold their company stock prior to the company's downfall.
Lower-level employees were prevented from selling their stock due to 401k restrictions and many subsequently lost their life savings.
Enron paid the top 140 executives $680 million in 2001. Kenneth Lay received $67.4 million and Jeffrey Skilling received $41.8 million.
Timeline: July 1985 - Enron is formed by the merger of Houston Natural Gas and Omaha-based InterNorth.
2000 - Enron reaches #7 on the Fortune 500 list.
August 14, 2001 - Jeffrey Skilling resigns as CEO, and Kenneth Lay becomes CEO again. (He had been CEO from 1985-2000.)
August 15, 2001 - Sherron Watkins sends a memo to Kenneth Lay about accounting issues.
October 16, 2001 - Enron announces a 3rd quarter loss of $618 million.
October 31, 2001 - The SEC opens a formal investigation in to Enron's transactions.
November 9, 2001 - Enron and Dynegy announce the $7.8 billion merger agreement. It would form Dynegy Corp, in which Dynegy would own 64% and Enron 36%.
November 28, 2001 - Dynegy announces it has terminated merger talks with Enron.
December 2, 2001 - Enron files for Chapter 11 protection, becoming the largest bankruptcy in U.S. history at that time and leaves thousands of workers with worthless stock in their pensions.
January 9, 2002 - U.S. Department of Justice opens a criminal investigation into Enron's collapse.
January 11, 2002 - The SEC widens its investigation to include Enron's chief auditor, Arthur Andersen, due to reports of document shredding.
January 15, 2002 - The NYSE suspends trading of Enron shares.
January 17, 2002 - Enron ends its partnership with Arthur Andersen.
January 23, 2002 - Kenneth Lay resigns as chairman of the board and CEO.
January 25, 2002 - Former Enron vice chairman J. Clifford Baxter commits suicide in Sugarland, Texas.
January 30, 2002 - Enron appoints Stephen Cooper as its interim CEO.
February 4, 2002 - Kenneth Lay resigns from Enron's board of directors.