[cmsmith]

>If Mr. Musk were somehow to increase the value of Tesla to $650 billion — a figure many experts would contend is laughably impossible and would make Tesla one of the five largest companies in the United States, based on current valuations — his stock award could be worth as much as $55 billion

Except that as the article says, he already owns 20% of Tesla, so his current shares would rise in value by $110B. He could fail to meet any of performance targets and still be pulling in a billion dollars a year in capital gains.