It was a rough month for investors in the market, but some stocks had more meaningful moves than others. These four stocks illustrate important trends that are likely to influence stock market performance over the next few months. Consider these dynamics before making changes to your portfolio. 

(NASDAQ: TSLA) stock dropped almost 20% last month due to a combination of bad news and unfavorable market conditions. The company reported weak third-quarter earnings with low delivery volume. Investors were prepared for bad news, and the results were even worse than feared.

Tesla's operating expenses and capital investments continue to rise, so the revenue weakness translated to deteriorating profit margins and lower cash flows. That's a disaster scenario for a growth stock with expensive valuation ratios and increasing competition.

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Source Fool.com