Offer your thoughts or opinion on the input financial query or topic using your financial background.

What percent of a company are you buying when you purchase stock?
Your question has already been answered, you divide the amount of shares you own * 100% by the total amount of shares. However, I feel it is somewhat misleading to talk about owning a percentage of the company by owning shares. Strictly speaking, shares do not entitle you to a part of the company but instead give you a proportional amount of votes at shareholder meetings (assuming no funky share classes). What this means is that someone who owns 30% of a company's shares can't just grab 30% of the company's assets (factories, offices and whatever) and say that they are entitled to own this. What they actually own is 30% of the voting rights in this company, this means that they control 30% of all available votes when the company calls a vote on corporate actions, choosing a new director etc. which is how shareholders exert their influence on a company.