Elon MuskAP

Elon Musk is worth $13.1 billion as of September 2015, but allegedly doesn't believe in the word "business."

The tech entrepreneur, born in South Africa in 1971, reportedly told Wait But Why earlier this year that "there's no such thing as a business, just pursuit of a goal."

Whatever Musk labels his efforts, he sure has involved himself in a bunch of them — major online payment services, building and launching spacecraft, and trying to cover the world with solar panels, to name a few.

The breadth of his reach is astounding, and it's enough to make anyone feel exhausted.

To cut through that complexity, we've highlighted 18 entities that Musk has reportedly founded, cofounded, invested in, or supported in some way.

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