The answer to your question depends on a number of things: what type of entity the company is, what state it is organized in, and most importantly, what the organizational documents say. Generally, it is the fiduciary duty of the Board (if it is a corporation), and in some cases (e.g. Delaware) the majority stockholders, to act int he best interest of ALL shareholders, including minority shareholders, in making decisions for the company, including those that involve significant dilution. And, in some states, there are statutes that require the vote of minority shareholders for some types of actions. However, the organizational documents of the company can often override these protections. So, it would be impossible to give you a reliable picture of your "rights" without that information. I am a startup attorney and would be happy to help you get to the root of your questions, if you would like to provide more info or set up a call.