 This topic has 12 replies, 3 voices, and was last updated Apr17 by Sophie Macon.

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In level 2 syllabus, it mentioned that as time to maturity gets lesser the value of a call and put option will decrease towards $0.
However, there’s no mention of whether that would be applicable for a call/put option that’s deeply in the money (from a logically thinking since it’s deeplyinthemoney, there’s lesser uncertainty of losing hence the option price should be slightly less than the value gained from exercising the option or the difference between the market price and the exercise price).
So why would a deeplyinthemoney call/put option losses it’s value as time theta is reaching 0?

@vincentt – all else constant, an option theta measures the fall in value of a given option as it nears it’s maturity/expiry. This relationship is one way (always negative, unlike delta).
So even for a deeply ITM options, assuming all else is constant, it loses value over time as it loses the time/opportunity to get more/deeper ITM.

when you mention “it loses value” are you referring to theta loses it’s value?
For example a dealer is selling a call option with an exercise price of $40 (current market price of the underlying is $35) with say 6 months to maturity.
So obviously, you have got quite a bit of time for the stock to fluctuates towards a gain or a loss.
However, if the current market price is at $80 and there’s 1 day left to maturity, shouldn’t it be pretty certain that the call option buyer would be able to gain from the call option hence the current market price of the option (if the dealer is still selling it) would cost slightly less than $40 ($80$40) as that would be the value anyone could secure by purchasing the call option.
Am I on the right track?

Theta doesn’t lose value, the option value does. Sorry I wasn’t clear above. Theta is just the measurement of option value’s sensitivity to time, i.e. change in option value due to change in time.
Your reasoning seems fine. Option value comprises of intrinsic value and time value. For the call option example above, as it’s deep in the money when it’s so near expiry, the option value ($40 as you mentioned above) is mostly comprised of intrinsic value and theta is near 0 since it’s so near maturity.







Yes, these graphs assume all else constant. So, for a given strike price and stock price (fixed), we expect the option price (which in this sense is mainly time value of the option, since intrinsic value doesn’t change as the value is fixed) will reduce as it nears maturity, to 0 eventually. I guess I can see why you got confused with the labels




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