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I don't think that means what you think it means, perhaps you are international? A Public company is one that is owned by shareholders of a public exchange. This is why Elon can buy into it and become a member of the board. If it were a private company he could not do that.

No, it is literally a public company. TWTR is traded on NASDAQ. Which is why we are having this discussion based off of SEC filings. Private companies are not required to file with the SEC.

I believe they mean public in the publically-traded sense, but I agree with you. It's not in the public (citizen controlled) sense

If it wasn't a public company, it wouldn't be under the SEC's jurisdiction.

> If it wasn't a public company, it wouldn't be under the SEC's jurisdiction

All securities are under the SEC's jurisdiction, including those issued by unlisted companies, e.g. start-ups.