Go deeper: USA vs. Elon Musk

Illustration: Sarah Grillo/Axios

Tesla Motors has been subpoenaed by U.S. securities regulators, related to Tesla CEO Elon Musk's efforts to take the company private.

Why it matters: Musk is one of America's most consequential tech executives. Not only because of his unparalleled audacity and futuristic vision, but also because he has no clear successor at his largest company, Tesla. Now, both Musk's and Tesla's futures are at risk.

DoorDash is now valued at $4 billion

DoorDash co-founder and CEO Tony Xu. Photo by Noam Galai/Getty Images.

Food delivery startup DoorDash on Thursday said it has raised $250 million in new venture capital funding at a $4 billion post-money valuation.

Why it's a big deal: This comes just five months after the company raised $535 million at a $1.4 billion valuation, in a round led by SoftBank Vision Fund.