DETROIT (AP) Elon Musk sold another $3.58 billion worth of Tesla stock this week, but it wasnt clear where the proceeds were being spent.

The Tesla CEO, and new owner of Twitter, sold the shares from Monday through Wednesday, according to a filing posted Wednesday night by the U.S. Securities and Exchange Commission.

Musk has sold nearly $23 billion worth of Tesla stock since April, with much of the money likely going to help fund his $44 billion acquisition of Twitter.

The sale comes as shares of the electric vehicle and solar panel maker have collapsed, losing over half their value since Musk first disclosed in April that he was buying up Twitter stock.

The falling shares have bumped Musk from his status as the worlds wealthiest person, with his net worth falling to $174 billion, according to Forbes. He was passed last week by French fashion and cosmetics magnate Bernard Arnault.