Multiple choice general knowledge When did Lehman brothers file Chapter 11 bankruptcy protection? September 16 2008 September 15 2008 September 22 2008 January 20 2008 Reveal answer Fill a bubble to check yourself B Correct answer Explanation Lehman Brothers filed for Chapter 11 bankruptcy protection on September 15, 2008. This event is widely considered the tipping point of the 2008 global financial crisis, marking the largest bankruptcy filing in U.S. history at that time.