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Why naked call writing is risky compare to Covered call?
If the buyer exercises your option, you will have to give him the stock.  If you already own the stock, the worst that can happen is you have to give him your stock, thus losing the money you spend to buy it.  So the most you can lose is what you already spent to buy the stock (minus the price the buyer paid for your option). If you don't own the stock, you will have to buy it.  But if the stock skyrockets in value, it will be very expensive to buy it.  If for instance you buy the stock when it is worth $100, sell your covered call, and the next day the stock shoots to $1000, you will lose the $100 you got from the purchase of the stock.  But if you had used a naked call, you would have to buy the stock at $1000, and you would lose $900. Since there is no limit to how high the stock can go, there is no limit to how much money you may lose.