Today's Trading Plan: Weakness In High Gear By: TalkMarkets September 12, 2016 at 11:03 AM EDT S&P 500 had one of its biggest sell-offs of the year on Friday, catching the large majority of market participants by surprise. Read More >> Related Stocks: Dow Chemical GameStop Corp Goldman Sachs Group Microsoft PowerShares QQQ S&P Depository Receipts Target Corp