SAN FRANCISCO (MarketWatch) -- Tech stocks mostly headed north in early trading Tuesday, led by Apple Inc. AAPL, +0.30% and upbeat reaction to the company's earnings results. Apple shares rose 2.4% to $102.10 after the company late Monday reported a fourth-quarter profit of $1.42 a share on $42.1 billion in revenue. Lexmark International Inc. LXK, +0.00% was also having a good day, as the printing-technology company's stock rose by 7% to $42.34 a share. Lexmark reported better-than-expected quarterly results prior to Tuesday's market open. Yahoo Inc. YHOO, +1.05% was up by 1% at $39.74 a share ahead of the company's earnings results, due after the close of trading. The tech-heavy Nasdaq Composite Index COMP, -0.09% rose 51 points to 4,367.