* Adobe Systems outlook tops Wall Street expectations
* Alpha Natural Resources bids for Massey Energy - report
* DSM to buy Martek Biosciences for $1.1 billion
* Futures up: Dow 36 pts, S&P 4.4 pts, Nasdaq 5.5 pts
* For up-to-the-minute market news see [
] (Adds Martek Biosciences deal in paragraph 6)By Edward Krudy
NEW YORK, Dec 21 (Reuters) - U.S. stock index futures rose on Tuesday as a higher earnings outlook from software maker Adobe Systems and more mergers looked to add fuel to the December rally.
Adobe Systems Inc <ADBE.O> forecast earnings late on Monday sharply above Wall Street's projections, contrasting with a pessimistic outlook three months ago. Its shares surged almost 7 percent in premarket trade.
Alpha Natural Resources Inc <ANR.N> made an offer for rival U.S. coal miner Massey Energy Co <MEE.N>, the Wall Street Journal reported, citing members of Massey Energy's board. Massey shares rose 2.7 percent in premarket trade to $53.20.
The U.S. stock market continues to make new highs after taking out key technical resistance levels. The S&P 500 has rallied nearly 6 percent so far this month, defying some expectations of a pullback, and is up around 21 percent from its lows this year.
"It looks as though the Santa year-end rally continues," said Peter Cardillo, chief market economist at Avalon Partners in New York. Cardillo said earnings and mergers were supporting a technically strong market.
Dutch group DSM <DSMN.AS>, the world's largest vitamins maker, is buying U.S. baby food ingredients maker Martek Biosciences Corp <MATK.O> for $1.1 billion, sending its shares up 34 percent to $31.30. [
]S&P 500 futures <SPc1> rose 4.4 points and were above 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 <DJc1> gained 36 points, while Nasdaq 100 futures <NDc1> rose 5.5 points.
The S&P 500 has gained for the last 3 weeks. The index broke through the 61.8 percent Fibonacci retracement of the 2007-2009 bear market slide earlier this month. Technicians say the next stop is the 76.4 percent retracement at 1,362.
Jabil Circuit Inc <JBL.N> posted late on Monday first-quarter results that topped analyst estimates, helped by growth across segments, and forecast a robust second quarter, sending shares of the electronics manufacturing services provider up 7 percent in premarket trading. [
]European stocks were up 0.6 percent in morning trade in thin volume, with record-high copper prices helping mining stocks. Investors brushed aside Moody's warning it may downgrade Portugal's debt' rating. [
].U.S. stocks tacked on further gains to push the S&P 500 to a two-year high on Monday, continuing a steady upward march investors say should continue in 2011. (Editing by Padraic Cassidy)