Elon Musk is $100 billion richer than in April thanks to Tesla's stock surge — and worth more than McDonald's or Pepsi

• Elon Musk is worth more than Salesforce or Pepsi after a $100 billion wealth gain since April.
• His fortune tanked by $65 billion in the spring but has rallied to $270 billion.
• The Tesla CEO has gone from the world's biggest wealth loser this year to its fourth-biggest gainer.

Elon Musk is riding high again after a rough start to the year.