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Five warning signs that stocks could be getting too bubbly

Trader on the floor of the New York Stock Exchange.
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Stocks are at record highs and Wall Street is getting feverishly bullish. What could possibly go wrong?

While many analysts really don't see much that could derail the market's bull run between now and the end of the year there are some warning signs that investors seem to be ignoring.

"One of the biggest red flags out there is that there don't seem to be any red flags out there," said Paul Hickey, co-founder of Bespoke. "For every potential negative, people have a quick explanation to refute it."

For some bulls, the debt ceiling debate and government shutdown were a blessing in disguise because they pushed back expectations for a tapering of the Federal Reserve's easing program into next year, meaning lower Treasury yields and sunny skies for stocks. That and the seasonal high that usually drives stocks at the end of the year created a launch pad for optimism around U.S. equities.