Both stocks are also down from their highs over the past month — Tesla by 14% and Solar City by 20%. Tesla topped out during the trading day at $291 on Sept. 4, and Solar City hit $76 on Sept. 12.
Elon Musk is CEO of Tesla and chairman of Solar City, so he's been shedding net worth. How much net worth? He owns over 33 million shares of Tesla and almost 21 million shares of Solar City.
The declines from the peak trading values for those companies have personally cost Musk something on the order of .7 billion.
JPMorgan recently joined a chorus of sell-side firms that have sounded a more cautious note on Tesla in recent weeks — a chorus that includes Morgan Stanley, Goldman Sachs, and several other market observers.
Both Tesla and Solar City closed down on Monday: Tesla at $250 per share and Solar City at $61.
On a more upbeat note, Musk is also CEO of the private space company SpaceX, which had a successful rocket blastoff over this past weekend and has begun building its own launch facility in Texas.
You might also like: