Now is the right time to turn cautious on the stock market By: MarketWatch May 02, 2019 at 09:55 AM EDT The S&P 500 and Nascaq Composite have recently set new records, but there are plenty of warning signs, writes Michael Brush. Read More >> Related Stocks: Amazon.com Apple Facebook Microsoft Nasdaq Composite Nasdaq ETF Russell 2000 Value Ishares ETF SPDR S&P 500 ETF Trust Short Dow30 -1X ETF Short QQQ -1X ETF Short S&P500 -1X ETF Ultrashort S&P500 -2X ETF VIX