Intel, AT&T, HP, Apple, RIM: Tech Premarket (Update 1)

Research In Motion has been added to this story, along with updated share prices.

NEW YORK (TheStreet) -- Intel(INTC) shares plunged 6% in premarket trading on Friday following the chip giant's fourth-quarter results.

The No. 1 chipmaker on Thursday reported revenue of $13.5 billion and earnings of 48 cents a share, exceeding analysts' forecast of $13.53 billion and 45 cents a share. Intel's first-quarter and full-year 2013 guidance, however, was weaker than Wall Street expected, pushing the company's shares down in extended trading.

Shares of the Santa Clara, Calif.-based tech giant fell 6% to $21.32 before market open. Intel was also the most active pre-market Nasdaq stocks on share volume of 2,484,155.

AT&T(T) was another premarket laggard, dipping 0.99% to $32.87. Late Thursday the telecom giant announced that it will take a $10 billion fourth-quarter charge related to its pension and benefit plans.

"We expect to record a non-cash, pre-tax charge of approximately $10 billion related to actuarial gains and losses on pension and postemployment benefit plans," AT&T revealed in a regulatory filing."

HP(HPQ) was also down in premarket trading, off 1.23% at $16.90. Shares of the PC maker had spiked earlier this week following a news report that potential purchasers are evaluating the company's Autonomy and EDS units.