Secondary research uses outside information assembled by government agencies, industry and trade associations, labor unions, media sources, chambers of commerce, and so on. It's usually published ...

Shares of Tesla Inc., Elon Musk’s public company, have been in freefall for the last few months. But shares in his private companies aren’t.

But shares in his private companies aren’t. Secondary market investors have sent the collective valuation of four of Musk’s private entities up 45% since the US election, according to a new ...