Here's What's Coming Up On PreMarket Prep For October 31 By: Benzinga via Benzinga October 31, 2017 at 08:04 AM EDT On Tuesday's edition of PreMarket Prep, we're discussing earnings from Mastercard, Under Armour, and Pfoizer, among ... Read More >> Related Stocks: MasterCard Pfizer Qualcomm, Inc. S&P Depository Receipts Under Armour