Investors have been dipping into growth-oriented cyclicals, the sectors that have been under appreciated most of the year, and if it continues, the trend could add more momentum to the stock market rally.

"We are continuing to see a lot of money coming into the market, whether it's coming off the sidelines or into the mutual funds—$150 billion came out of money markets so far this year," said David Lutz, managing director and head of exchange-traded fund trading at Stifel Nicolaus. "We may see a pullback at some point, but it should be relatively short-lived and I'd be watching for a sector rotation."