This is bad news for Tesla shareholders: there's a theory that Elon Musk is deliberately keeping the stock cheap so his other company, SpaceX, can buy Tesla on the cheap.

• The idea is that a weak Tesla stock makes it cheaper for SpaceX to acquire Tesla.
• Musk controls about 81% of SpaceX's voting shares, so buying Tesla through SpaceX would hand him control of Tesla too.
• Tesla might sell off its Shanghai operations to clear the way for a SpaceX-Tesla merger.
• The takeover price being floated is around $100 a share, well below where Tesla trades now.

Outlook: Expect more weakness in Tesla stock if this plan is real, with a possible SpaceX buyout as the endgame.