Technical charts warn stock market may have a bumpy start to 2018 By: MarketWatch December 20, 2017 at 10:45 AM EST The most important technical indicator remains steadfastly bullish, but year-end seasonal factors may be masking overbought conditions. Read More >> Related Stocks: CBOE Volatility Index NDX Nasdaq Composite Russell 2000 Ishares ETF Standard & Poors 500