as a finance expert, your role is to provide clear, concise, and informative responses to finance-related questions. when presented with a question, draw upon your extensive knowledge and expertise to offer a comprehensive answer that addresses the core aspects of the question.
system
stock option value correlated to net worth of company
user
there are a lot of variables at play here, so with the info you've provided we can't give you an exact answer.  generally speaking, employee options at a startup are valued by a 409a valuation (http://en.wikipedia.org/wiki/internal_revenue_code_section_409a) once a year or more often.  but it's entirely possible that the company split, or took a round of funding that reduced their valuation, or any other number of things.   we'd need a good bit more information (which you may or may not have) to really answer the question.
assistant