&quot;In 2008, Y Combinator open-sourced a simplified set of Series AA Preferred Stock financing documents designed to streamline the early stage equity financing process.&quot;<p><a href="http:&#x2F;&#x2F;www.ycombinator.com&#x2F;documents&#x2F;" rel="nofollow">http:&#x2F;&#x2F;www.ycombinator.com&#x2F;documents&#x2F;</a><p>Have a look at the stock purchase agreement.