US STOCKS-Futures point to early drop from record levels
* S&P has ended higher 11 times in past 13 sessions
* CBOE Volatility index remains near lowest since 2007
* Achillion Pharma jumps in heavy premarket volume
* Futures down: Dow 20 pts, S&P 4.4 pts, Nasdaq 8.25 pts (Updates prices, adds RadioShack)
By Ryan Vlastelica
NEW YORK, June 10 (Reuters) - U.S. stock index futures edged lower on Tuesday, as investors found few reasons to keep buying with the Dow and S&P 500 just below the latest in a string of records.
* Equities have been strong lately, with the S&P ending at records for the past four sessions, and rising in 11 of the past 13. While Wall Street's upward trend is still seen as intact, it may be harder to continue notching solid gains in the absence of big catalysts. There are no major economic indicators on tap for Tuesday.
* Investors continue to watch trading volume, which has been below average of late, potentially making the market more susceptible to big swings. The CBOE Volatility index, which typically moves inversely to the S&P, rose 3.9 percent on Monday despite the market's advance. The "fear index" recently fell to its lowest since February 2007, and remains at levels that are very low from a historical perspective.
* S&P 500 futures fell 4.4 points and were below fair value, a formula that evaluates pricing by taking into account interest rates, dividends and time to expiration on the contract. Dow Jones industrial average futures fell 20 points and Nasdaq 100 futures lost 8.25 points. Continuación...