The cumulative value of SpaceX, Neuralink, the Boring Company, and xAI has shot up 45% on private markets since last November, according to data provided to Fortune by secondary market trading platform Caplight . Musk's social media company X was not factored into the calculation because of a lack of interest from investors on the secondary market.

The brother of Tesla CEO Elon Musk has been selling Tesla stock. Kimbal Musk has been offloading shares in recent months, just as Tesla stock has made a massive retreat from all-time highs that put the stock, however briefly, among the select group of trillion-dollar companies.

After a slight rebound earlier this week, Tesla's TSLA stock is back to falling, keeping with its recent performance. Even U.S. President Donald Trump's purchase of one hasn’t done much to spark real momentum for the electric vehicle (EV) leader.

In an unsigned letter, Tesla encourages trade representative to reconsider tariffs, saying they could hurt U.S.-based car manufacturers.

In a letter to Trump officials, Tesla raised concerns about the president's tariffs -- but it's unclear if CEO Elon Musk was personally involved in sending the letter.

"As a traditional investor, it doesn't fit any valuation system that makes any sense compared to any other stock," Ross Gerber said of Tesla.

Tesla (TSLA) took a brutal hit this past week, plunging 15% in a single day, one of its worst performances since going public. The drop erased