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These are the companies that generate more than 20 percent of their revenue supplying to Apple, according to FactSet.
Since 1950, September is the worst performing month for the S&P 500 index.
Here's how to tell if excessive shorting will result in a reversal known as a short squeeze.
While U.S. indexes suffer from the dog days of summer, emerging markets look to be on a tear.
The Dow shattered through the 17,000-mark Thursday for the first time ever. So far this year, however, the index has been left behind.
The Dow and S&P 500 gained in at least 12 World Cups, on average more than 5 percent for the year.
The S&P 500 is on track for its best weekly gain since July, but if history is any indication, those gains may evaporate on Monday.
More new shorts were added in Nasdaq stocks in the end of March, but they declined on NYSE names.
Demand for small-cap stocks is increasing relative to established large-cap names, a divergence that signals continued risk appetite among investors.
With stocks near all-time highs, short interest reached the highest level in 20 months, but some investors are seeing the trend as a bullish sign.