Apple's required filing of form 8-K with the SEC, a formal notice to the regulatory body as well as shareholders of major changes within the company, reveals that the board of directors has offered new CEO Tim Cook a strong incentive to stay for the long haul -- an offer of one million shares of "restricted" stock that, if valued by today's stock price, would be worth $383 million, AppleInsider reports. Cook will receive half of the units on his fifth anniversary as CEO, and the other half on his tenth.