I'm new, haven't made any trades yet. want to know this from the brokers point of view. He has to supply me with a stock at the strike price if I choose to exercise the option. Say the contract is for $10 and now the stocks value is up to $15. How does the broker go about buying the stock for me at $10 when the market is now costing him $15 to purchase it? Is he paying the $5 difference out of his own pocket? Or does he procure it in some way for $10? 