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. Apple ( AAPL) shares were down 0.33% to $501.01 on share volume of 74,365. Research In Motion ( RIMM) was a major gainer, rising 5.9% to $15.79 after Jefferies upgraded the handset maker to buy and raised its price target to $19.50 from $13. The analyst firm predicted that RIM's May and August quarter results will be well above Wall Street's estimates, boosted by a $600 average selling price for its forthcoming BlackBerry 10 devices and guaranteed volumes from carriers. Jefferies analyst Peter Misek also noted that RIM will enable corporate email on iPhones and Google ( GOOG) Android devices. "This change we believe is unknown or not well understood but is important," he added. RIM was also one of the most active premarket Nasdaq stocks on share volume of 703,880. Dell ( DELL), which has been the subject of buyout rumors, was up 0.23% at $12.85 on Friday. Facebook ( FB) was also a modest gainer, rising 0.3% to $30.23, just days after the social networker unveiled its Graph Search technology at its headquarters in Menlo Park, Calif. Sirius XM ( SIRI) was another gainer, rising 0.79% to $3.17 on share volume of 251,662. --Written by James Rogers in New York. Follow @jamesjrogers >To submit a news tip, send an email to: email@example.com.