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Can you see all shareholders of a company?
There is no list that shareholders can access to see everyone who is invested in the company. Many websites will list the biggest shareholders, but that’s it. According to the Securities and Exchange Commission (SEC), a company must provide shareholders with the means to contact other shareholders during proxy solicitations and in connection with a tender offer. In both cases, the SEC says: “the company may choose to either give the list to the person who requested it or mail the shareholder's soliciting or tender offer materials to other shareholders at the requesting shareholder's expense.”18It’s also possible that state laws or a company's charter and by-laws make a shareholder list accessible in other circumstances.

https://www.investopedia.com/investing/know-your-shareholder-rights/