“One widely watched sentiment indicator is the weekly US Advisors’ Sentiment Report, published by Investors Intelligence. It looks at more than a hundred independent newsletters and assesses each author’s stance on the market: bullish, bearish or correction. The norm is about 35% bears. But as you can see from the chart below, the number of bears just came in at only 13.3% – the lowest level since February 1987. It’s another sign that US stocks are becoming a worryingly crowded trade. If you look, for example, at all the times the bears dropped below 14% going back to the 1970s, you’ll see that the following average 12-month returns for the S&P 500 were just 0.7%.”
http://bonnerandpartners.com/last-time-indicator-flashed-red-1987-sentiment/