expiration date
Expiration date is the last day an option or contract is valid, after which it simply stops existing and any right you had to use it disappears.
In plain English
The bread in your kitchen has a date stamped on the wrapper that tells you when it stops being bread and starts being a problem. Nobody argues with that date. Once it passes, the bread does not become 'a little bit expired', it is simply done, and you either used it in time or you did not.
An option contract on the stock market works the same way, except instead of bread going stale, the right to buy or sell a stock calmly stops existing. Say a trader in Lagos buys a call option on a company listed abroad, giving them the right to buy the shares at a fixed price before a certain Friday in March. That Friday is the expiration date. Use the right before then, or lose it, there is no extension, no grace period, no begging the baker for one more day.
This matters because options are priced partly on how much time is left before that date. Two options on the same company can look similar in every way except one expires next week and the other expires in six months, and the six month one will usually cost more, simply because more time means more chances for things to go your way.
A Nigerian in London trading contracts for difference or options through an app back home has probably watched the value of a position melt away as the expiration date crept closer, even though the share price barely moved. That melting is time running out, the same way milk does not need anyone to touch it to go off, it just needs enough days to pass.
Bonds and some other instruments carry a similar deadline called maturity, but expiration is the word you will meet most often in the world of options and futures, where timing is not a detail, it is half the whole game.
An investor buys a call option on Nigerian Breweries shares with an expiration date of 30 June, giving them the right to buy at a fixed price before that day. If the share price has not risen above that fixed price by 30 June, the option expires worthless and the investor simply loses what they paid for it, nothing more.
Questions people ask
What happens if I forget about an option's expiration date?
If the option is not exercised or sold before the deadline, it simply expires and becomes worthless if it was not profitable to use, and you lose whatever you paid for it, so it pays to set a reminder rather than trust memory alone.
Is expiration date the same thing as maturity date?
They mean something similar, a final deadline, but expiration date is the term used mostly for options and futures contracts, while maturity date is the word used for bonds and other debt instruments where a fixed sum is repaid.
Does a stock itself have an expiration date?
No, ordinary shares you buy on the Nigerian Exchange or any stock exchange do not expire, you can hold them for decades, it is derivative contracts like options and futures that carry an expiration date, not the underlying shares themselves.
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