There has been a lot of activity over the last year.

Musk's company has made progress in developing a rocket that can return humans to the moon, but its shares have plummeted.

A big part of Musk's wealth is tied up in the company. The drop in Musk's wealth was the largest of any billionaire to date.

He was worth $340 billion a year ago. Even though his net worth has fallen to $170 billion, he still remains the wealthiest person in the world.

Tesla Turmoil

The billionaire CEO is a shareholder in the electric car company. After hitting a two-year low on Monday, Musk's wealth was wiped out in just one day.

Adding to the chaos is the fact that Musk has been selling billions of dollars' worth of shares in order to keep the lights on at the company.

Musk is worried that he has less attention left for his other ventures because he has committed most of his recent time to spreading havoc at the micro-blogging site.

Bad Feeling

The economic downturn has been a factor inTesla's troubles. A "super bad feeling" about the economy led to Musk cutting 10% of his workforce.

The company's operations in China have had to contend with the country's strict zero- carbon policies.

Despite his car company's troubles, Musk is still the richest person in the world. One has to wonder how long he will be able to hold onto that title.

Musk's wealth loss is the largest on record for the first time.

Musk asked people to meet him on the 10th floor after he locked the employees out of the office.