Has to be both a new industry he wasn't in before, and a new/acquired company/brand. So it can't be a new industry by an existing Musk company/brand, or a new Musk company/brand in an industry he was already in.

So if SpaceX starts making weapons that's not a new company in a new industry, but if Musk buys Raytheon then it counts. Twitter buying Mastadon would not count, because that's the same industry.

The spirit of the question is that his current major, distinct companies/brands and their industries are:

Twitter/X - Social Media

xAI - Generative Artificial Intelligence

Tesla - Electric Vehicles / Batteries

SolarCity - Renewable Energy (Acquired by Tesla, but distinct enough to count)

SpaceX/Starlink - General Aerospace Company / Telecommunications

Neuralink - Neurological Research / Cybernetics

The Boring Company - Construction / Tunnels

These are what I think a reasonably informed layperson might say if you asked them to name all the Elon Musk companies. A distinct new entry in this list resolves this market.

I am open to defining more formal criteria of what would resolve this market, and may update these criteria to better fit the spirit of the question.

Please try to avoid submitting industries that are too similar to existing answers in the market, if I judge something to be overlapping I may label it invalid.

If Musk starts/acquires a large company that is in several distinct industries, I will resolve to the answer that best describes them. I may privilege older accurate answers over newer, more specific answers that are added only after news breaks.

I've set the initial resolution date to mid 2024 to remind myself to check on this question, and will continue extending the close date by 6 months each time I do so.

If Elon does not start/acquire a new major company/brand in a new industry by 2028, this resolves to [No new industry/company/brand by 2028].