Tesla's Musk approaches a $1.8 billion bonanza

Fueled by stronger-than-expected car deliveries, shares of Tesla have surged over 40% in the past seven sessions, elevating the company's market capitalization to $259 billion.More important for Musk's personal finances, Tesla's six-month average market capitalization has reached a record $138 billion.Hitting a six-month average market capitalization of $150 billion would trigger the vesting of the second of 12 tranches of options granted to the billionaire to buy Tesla stock as part of his 2018