The stock market lost more than $2 trillion in October. Here's what happened By: CNBC.com News October 31, 2018 at 14:07 PM EDT October is on pace for one of the worst months since the financial crisis. Read More >> Related Stocks: 3M Co Adv Micro Devices Alphabet-A Amazon.com Applied Materials Caterpillar Facebook International Business Machines Micron Technology NVIDIA Corp Netflix