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Apple became the first U.S. company to top the $800 billion mark in market capitalization on Tuesday, slightly more than two years after it crossed the $700 billion threshold.

1. How much have the iPhone maker’s shares have gained this year?
2. What percentage does Apple make up of the entire S&P 500 .SPX index?
3. How have stock buybacks boltered Apple’s stock?
4. What stake does Berkshire Hathaway have in Apple?

Reuters Staff. APPLE MARKET CAP PASSES $800 BILLION. Newsweek, May 10 (Retrievable online at