By Ryan Vlastelica
NEW YORK (Reuters) - U.S. stock index futures pointed to a modestly lower open on Thursday as investors continued to digest comments from Federal Reserve Chair Janet Yellen, who raised the specter of an earlier-than-expected rate hike.
Yellen's comments indicated that the first increase in interest rates could come early next year, rather than in the second half of 2015, as had been widely expected by analysts. The comments ended a two-day advance on Wall Street that had taken the S&P 500 near record levels.
Geopolitical concerns also continued to weigh on sentiment as Russian troops seized two Ukrainian naval bases, including a headquarters in the Crimean port of Sevastopol. The United States warned Russia that it was on a "dark path" to isolation in the biggest crisis between the two countries since the Cold War.
While few U.S. companies have outsized exposure to the region, investors are concerned about the fallout to any escalation in tension.
Lennar Corp
In a statement released on Wednesday, the U.S. central bank made clear that it would rely on a wide range of measures in deciding when to raise interest rates, dropping the unemployment rate as its definitive metric. Subsequently, Yellen said the "considerable period" between the end of the Fed's bond-buying stimulus program and the first rate increase from the central bank could be six months, raising questions about the timing of a rate hike.
S&P 500 futures fell 4.7 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 39 points and Nasdaq 100 futures fell 10.25 points.
The S&P 500 is within 1 percent of its record closing high, but volume has been anemic on positive market days, suggesting limited conviction behind the move.
Volume is expected to surge on Friday as options expiration takes place alongside multiple index rebalances. Credit Suisse estimates $14 billion in gross trading will stem from the S&P 500 index rebalance, with another $6 billion coming from rebalancing in other indexes.
In the latest economic data, jobless claims rose by 5,000 in the latest week, less than expected. At 10 a.m. (1400 GMT), February existing home sales and the March business activity index from the Philadelphia Federal Reserve will be released, with both seen rebounding from weakness in the previous month.
Jabil Circuit Inc
U.S. shares of GlaxoSmithKline
(Editing by Nick Zieminski)