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Why is stock dilution legal?
Theoretically, when a company issues more shares, it does not affect the value of your shares.  The reason is that when a company issues and sells more shares, the proceeds from the sale of those shares goes back into the company. Using your example, you have 10 out of 100 shares of the company, for a 10% stake.  Let's say that the shares are valued at $1,000 each, meaning that the market value of the company is $100,000, and your stake is worth $10,000. Now the company issues 100 more shares at $1,000 each.  The company receives $100,000 from new investors, and now the company is worth $200,000.  Your stake is now only 5% of the company, but it is still worth $10,000. The authorized share capital is the amount of shares that a company has already planned on selling.  When you buy stock in a company, you can look up how many shares exist, so you know what your percent stake in the company is.  When a company wants to sell more shares, this is called an increase of authorized share capital.  In order to do this, the company generally needs the approval of a majority of the existing shareholders.