Expiration time
Expiration time is the cut-off point on an option's expiration date after which the option contract ceases to exist and can no longer be exercised. Every listed option has an expiration date (the calendar day it dies) and, layered on top of that, an expiration time (the specific moment on that day when exercise rights stop being accepted).
The mechanics work in two stages. There is an official, exchange-set time — often something like the end of the trading day or shortly after the market closes — by which the options clearing organization must have received exercise instructions. But individual retail traders don't deal with the clearing organization directly; they go through their broker, and brokers set their own, earlier internal deadline so they have time to process everything and pass instructions up the chain before the official cut-off. That broker deadline is usually on the same day, sometimes even the evening before expiration, and it varies firm to firm.
The nuance that trips people up is confusing the expiration date with the expiration time, and assuming the well-known "official" time (often quoted as a round number like 5:00 or 5:30 in the afternoon) is the deadline that applies to them personally. In practice, a retail trader's real deadline is whatever their own broker imposes, which can be hours earlier. Missing your broker's window means your in-the-money option may not get exercised even though the contract technically hadn't expired yet by the exchange's clock.
This term depends on a rule or threshold that changes over time, so no specific figure is quoted here. The current entry states specific clock times (5:00 PM and 5:30 PM Eastern) for exercise cut-offs. These figures should be confirmed against the current OCC (Options Clearing Corporation) rules and the relevant exchange's rulebook, since exact cut-off times and the preceding-day notification deadline for public holders can be revised. Do not republish the specific times without checking the current OCC/exchange documentation; also note that individual brokers set their own, typically earlier, deadlines, which should be confirmed with the broker directly rather than assumed.
A day trader holding options into the close needs to know their broker's specific exercise deadline, not just the exchange's official one, because acting a few minutes too late can mean an option that should have been exercised for profit instead expires worthless.
A trader holds a call option that finishes $2 in the money at the close on expiration Friday. The exchange's official exercise cut-off might be stated as 5:00 or 5:30 PM Eastern, but the trader's broker requires exercise instructions by 4:30 PM Eastern that same day. If the trader tries to submit instructions at 4:45, the broker's window has already closed, even though the exchange deadline hasn't passed yet.
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