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Cupertino, California-based Apple has become the most valuable firm of all time, as measured by stock market valuation. With each of its shares hitting a price of $664.75, Apple's total market value surpassed the $619 billion record held by ... Microsoft since 1999. Apple's market value has been surging in the past year. When Steve Jobs , its popular and visionary co-founder died in October, 2011, the firm's market value was approximately $378.55. Even without Jobs at the helm, Apple's market value has increased 43 per cent since then, a period of just ten months. New iPad, iPhone Rumors Cause ... (view more)