What: Shares of Haynes International (Nasdaq: HAYN) popped 11.7% in intraday trading today, although there seems to be no recent news on this company.

So what: Haynes International operates in an unsexy industry, providing nickel- and cobalt-based alloys for use in manufacturing. What prompted the stock's major pop today is anybody's guess.

Now what: Investors should steer clear of buying stocks that reflect a sudden surge of inexplicable bullishness. Haynes doesn't even look like a bargain stock, since it trades at 66 times earnings. If there's no real catalyst, it's a good time to count to 10 and do more research.

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