By Barbara Kollmeyer, MarketWatch Strategist: S&P 500 could be a sell at 2,078

NEW YORK (MarketWatch) -- U.S. stock index futures nudged slightly higher on Tuesday as bulls seek to extend a four-day run of record closes for the S&P 500 and the Dow Jones Industiral Average, though the Veterans Day holiday could make for thin volume.

Also in focus for investors, the dollar tapped a fresh seven-year high against the Japanese yen above Yen116, and Alibaba Group Holding Ltd. retailer raked in more than $2 billion in sales in a single hour.

Futures for the Dow Jones Industrial Average (DJZ4) rose 15 points to 17,568, while S&P 500 index futures (SPZ4) added 2.2 points to 2,036.30. Nasdaq-100 index futures (NDZ4) rose 8 points to 4,178.50.

A thinly traded session on Monday still sent the S&P 500 index (SPZ4) and Dow industrials (DJZ4) to fresh closing record highs of 2,038.26 and 17,613.74, respectively. The CBOE Volatility index (VIX) fell to its lowest level in seven weeks.

A sell signal for the S&P? Chris Weston, chief market strategist at IG, said the S&P 500 could be a sell at 2,078. He noted that over the last 18 months, whenever markets reach a point when about 85% of stocks are trading above the medium-term 50-day moving average, the index has hit a ceiling. Four near-term catalysts for the next stock market crash

"Currently 78% of stocks are above the 50-day now, so a move to 2,078 would probably coincide with the top of the channel and back up my view that funds may take some long exposure off the table," said Weston, in a note.

The Veterans Day holiday could weigh on volumes. While for Wall Street stocks it is business as usual, bond markets and government offices are closed, with no data for investors.

Investors will also be watching the dollar(USDJPY), which hit fresh seven-year highs against the yen as it tapped Yen116. The dollar pared gains to change hands at Yen115.74 in recent action. As the yen fell, the Nikkei 225 index rose 2.1%.

"The catalyst of a stronger yen in the medium term could be a major change in the Federal Reserve policy. i.e. to keep interest rates lower for longer, or to announce another QE [quantitative easing] program if the U.S. economy slides in to a recession," said Nour Al-Hammoury, chief market strategist at ADS Securities in a note.

Boston Fed President Eric Rosengren said late Monday until there is stronger evidence that inflation will return to 2%, policy makers should stay patient about removing accommodation.

In an otherwise light day for economic data due to the Veterans Day holiday, the National Federation of Independent Business said its small-business optimism index rose 0.8 point to 96.1 in October, a two-month high.

Alibaba's big shopping day: Shares of Alibaba(BABA) slipped 1.8% in premarket trade even after its big online shopping day -- "Singles Day" -- raked in more than $2 billion in sales in one hour. See Alibaba's 'Singles Day' bigger than Black Friday

Need to Know: Alibaba's potential 959,729% return and the retail roar of Singles Day

Juniper Networks Inc.(JNPR) late Monday named Rami Rahim chief executive officer, replacing Shaygan Kheradpir, who resigned with immediate effect. Read: Juniper CEO resignation clouded in mystery

D.R. Horton Inc.(DHI) reported a rise in fiscal fourth-quarter earnings, but missed consensus estimates. Shares slipped 1%.

Zynga Inc.(ZNGA) shares rose 5.6% in thin premarket trade after Jefferies lifted shares to buy from hold, citing potential from high growth in mobile games.

The U.S.-listed shares of U.K. telecoms giant Vodafone PLC (VOD) jumped more than 6% in premarket action after the company said it is improving across its key European markets.

Other markets: European stocks tracked global markets higher. Gold prices (GCZ4) fell around $5.30 an ounce as the dollar climbed. Oil prices (CLZ4) also declined, with Brent trading at four-year lows. Read: Gold will signal when stocks have peaked.

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