US STOCKS-Futures point to quiet open with S&P at record
* S&P 500 coming off first close above 2,100
* Investors looking to Fed minutes for hints of rate timing
* Exxon down in premarket, Berkshire drops investment
* Futures down: Dow 20 pts, S&P 3.25 pts, Nasdaq 2.5 pts (Updates prices, adds data)
By Ryan Vlastelica
NEW YORK, Feb 18 (Reuters) - U.S. stock index futures pointed to a very slightly lower open on Wednesday, a day after the S&P 500 ended above 2,100 for the first time, as investors waited to see whether a debt deal would be reached with Greece.
Wall Street stocks have been tied to signs of progress or difficulty with Greece's bailout program of late, even though the United States has little direct exposure to the country. Market participants are concerned that if a deal isn't reached by Feb. 28, when a bailout program for Greece expires, increased volatility could spread through the euro zone.
European shares rose 0.6 percent, hitting a seven-year high after the Greek government confirmed it would ask for an extension of its loan agreement. Shares in Greek banks rose 6 percent.
Still, the situation in Greece remained uncertain, with the government in Athens also looking to renegotiate Greece's debts. U.S.-listed shares of the National Bank of Greece fell 8 percent in premarket trading. Continuación...