Regeneron stock closed at 488.87 on Friday. You receive 500 options valued at $244,435. You have the option to buy it at that price in 4 years. Let's say the stock increases by 10% and is now valued at $537.757 per share. You are in the money and you exercise your options and sell. You sell them for $268,878.50. That's a gross profit of $24,443.50. Then you have to deduct capital gains tax (20%) and that leaves you with $19,554.80 You also will have transaction fees to pay as well.
Here's where the value of working for a company with a high stock price comes in. Let's say the stock price was at $170 on Friday instead (which is where Amgen's stock price is). 500 shares are valued at $85,000. The stock increases in value by 10% over four years and the new price is $187. Your are in the money. You exercise your options for $93,500 and your gross profit is $8,500. Your Regeneron stock options' gross profit is 287% higher than if you worked for Amgen and they issued the same number of stock options to you!!