"While the issue of insider trading of private companies is a sensitive one, Twitter was apparently able to see Brown's side of the story." Brown had purchased Facebook shares on the secondary market last fall out of an apparent desire to take a bigger stake in the company he pitched to entrepreneurs. Facebook fired him in February, based on its policy against insider trading by employees. In a public statement, Brown admitted to the stock purchase but said he had "absolutely no knowledge" of a coming $1.5 billion funding round from Goldman Sachs.