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Value of a call option spread
You have to look at the real price of the share to calculate the value of the spread. 42$ at the start, 46$ at the end.  Think of it this way: When price was 42$ the call 45$ was out of the money, worth 100$ of time value only=100 the call 40$ was in the money and worth 200$ of intrinsic + 100 time value=300 the difference was 200$ Now that price is 46$ the call 45$ is worth 100$ in the money, real or intrinsic value the call 40$ is worth 600$ in the money, real or intrinsic value the difference is 500$ NOTE: 1. Commission fees are not included. 2. Time value of 100$ on both calls when price is 42$ is incorrect and for teaching purpose only.