Why Tesla Stock Popped, Then Dropped Today

Shares of Tesla (NASDAQ: TSLA) raced out of the gate Wednesday morning, climbing 2.3% in the first couple minutes of trading before beginning to fall back. Tesla's first big pop seems to have been sparked by a bit of corporate theater. In an apparent poke at the phenomenon of whistleblowers trying to embarrass their bosses, Elon Musk tweeted last night that Tesla is now selling a "limited-edition Cyberwhistle" shaped like its still-unavailable Cybertruck.