Amazon just announced a shake-up to its senior ranks, with a new second-in-command starting early next year. Here are the other high-powered executives behind some of the biggest CEOs in tech.

Business Insider

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· Many CEOs at the world's most valuable tech companies rely on No. 2 executives to help them get the job done. 
· Some of these execs may go on to run the company one day, while others may leave for big opportunities somewhere else. 
· For example, top executives like Sheryl Sandberg and Ted Sarandos are second-in-command...

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