Stock index futures pointed to a stronger open on Wall Street on Wednesday, with futures for the S&P 500 up 0.8 percent, Dow Jones futures up 0.5 percent and Nasdaq 100 futures up 0.8 percent at 0847 GMT.

* Tech majors Intel Corp and Yahoo Inc beat revenue expectations after the market's close on Tuesday, an encouraging trend for the sector and sparking a strong rally in Asian and European tech shares.

* Intel shares traded in Frankfurt were up 4.8 percent, while Yahoo shares traded in Frankfurt were up 1.8 percent.

* IBM shares traded in Frankfurt were down 2 percent. The company reported a decline in signings of new business at its global services division during the first quarter, even as it reported profit and revenue ahead of analysts' projections.

* Companies scheduled to report quarterly results on Wednesday include Apple Inc , American Express Co , AT&T Inc, United Technologies and Freeport-McMoRan Copper & Gold .

* Apple is expected to report quarterly results on Wednesday, tempered by caution over how supply constraints will squeeze margins and restrain iPhone and iPad sales.

* Economic indicators include March existing home sales.

* On the M&A front, U.S. power company AES Corp said it would buy smaller rival DPL Inc for $3.5 billion in cash to expand its footprint in the midwest region by adding 500,000 retail customers in West Central Ohio.

* Tokyo stocks snapped a three-day losing streak on Wednesday after Intel's earnings guidance sparked short-covering in chip-related stocks, while European stocks were up 1 percent in morning trade, led by tech shares such as ASML and Infineon .

* U.S. crude oil futures were up $1.32 at $109.60 a barrel on Wednesday, as a rebound in equities and a weaker dollar eclipsed fears over eroding demand.

* Encouraging results from health care and materials companies lifted U.S. stocks on Tuesday, but weak earnings from Goldman Sachs limited gains in a market skeptical of the growth outlook.

* The Dow Jones industrial average <.DJI> gained 65.16 points, or 0.53 percent, to 12,266.75 at the close. The Standard & Poor's 500 Index <.SPX> added 7.48 points, or 0.57 percent, to 1,312.62. The Nasdaq Composite Index <.IXIC> advanced 9.59 points, or 0.35 percent, to 2,744.97.

(Reporting by Blaise Robinson; Editing by Louise Heavens)