Google Chairman Eric Schmidt is planning on trading in some 3.2 million of his shares in the company. That equates to roughly 42 percent of his stake in the company which currently stands at about 7.6 million shares of Class A and Class B common stock. Currently, he has about 8.2 percent of the voting power.

At the current stock price, this transaction will net him around $2.5 billion. He intends to sell the stock over a period of one year and will use the cash to diversify his investment portfolio. Google said in today's filing, "Eric can diversify his investment portfolio and can spread stock trades out over a period of one year to reduce market impact."

For comparison, Google founder Sergey Brin holds about 8.5 percent of the voting power and co-founder Larry Page, the current CEO of Google, holds about 8.7 percent. We'll keep an eye on Google's stock to see how this affects the price.