SAN FRANCISCO – Tech stocks showed signs of weakness Thursday, with Apple Inc. down slightly at $523.79. Activist investor Carl Icahn published a letter he sent to Apple Chief Executive Tim Cook in which he outlined a proposal for Apple to launch a $150 billion stock buyback plan. Losses also came from Fusion-io Inc. , Akamai Technologies Inc. and Angie's List Inc. in the wake of those companies' quarterly results late Wednesday. The Nasdaq Composite Index managed to rise almost 3 points to 3,910.
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