By Ryan Vlastelica
NEW YORK (Reuters) - U.S. stock index futures were little changed on Tuesday, with investors finding few reasons to buy after a rally in the previous session that took the S&P 500 above 2,000 for the first time.
The S&P failed to hold that level on Monday, though the benchmark index ended at a new closing high. Equities have rallied lately, with both the Dow and S&P advancing in seven of the last 10 sessions, while the Nasdaq has climbed in eight of the last 10 trading days.
That momentum is still considered intact, and the S&P's price-to-earnings ratio is within historical norms, leading many analysts to believe the market is not overvalued. Nonetheless, further gains may be a challenge without positive catalysts and amid potential headwinds such as a reduction in Federal Reserve stimulus and a simmering conflict between Ukraine and Russia.
Much of the market's recent gains have come on low volume, suggesting many traders may be reluctant to jump in at current levels.
S&P 500 e-mini futures
Biotechnology stocks were among the biggest drivers during Monday's rally. That appeared to continue Tuesday, with Achillion Pharmaceuticals
Shares of Best Buy Co Inc
Digital Ally Inc
Amazon.com Inc
(Editing by Bernadette Baum)