The generous stock bonus is supposed to convince important employees to stay with Apple instead of flirting with one of the many competitors who continuously try to snatch highly qualified software developers and hardware engineers from the Cupertino-based iPhone maker.
https://www.notebookcheck.net/Apple-rewards-some-of-its-software-developers-and-hardware-engineers-with-a-massive-US-200-000-stock-bonus.610132.0.html