What is ex-date risk for call sellers?
In one line: Ex-date risk is the chance that an in-the-money call you sold is exercised early, the day before the ex-dividend date, so you lose the shares and the dividend.
How it works
To get a dividend, you must own the shares before the Ex-dividend date. Someone holding a call doesn't get it. So if a call is in the money, the holder may exercise it the day before the ex-date, to own the shares in time.
They do this when the dividend is worth more than the call's remaining time value. Exercising throws the time value away but picks up the dividend. If the dividend is bigger, exercising wins for them.
For you, the seller, that's early Assignment. Your shares are sold at the strike, and the dividend goes to the holder. It can happen because US stock options are American-style options.
The check is simple: time value = call price − (stock price − strike). If that's less than the dividend, expect possible assignment.
An example (hypothetical)
You bought 100 shares of XYZ at $55 (an illustration, not a trade idea). It fell to $49. To bring in some premium, you sold a $48 call for $1.50, below what you paid.
XYZ bounces to $52. Tomorrow it goes ex-dividend, paying $0.80. The $48 call is $4 in the money and trades at $4.20, so only $0.20 is time value. That's less than the $0.80 dividend.
| What happens | Shares (paid $55) | Call | Dividend | Total |
|---|---|---|---|---|
| Assigned tonight, shares sold at $48 | −$700 | +$150 | $0 | −$550 |
| Not assigned; called away at $48 at expiry | −$700 | +$150 | +$80 | −$470 |
| You buy the call back today at $4.20 and keep the shares at $52 | −$300 on paper | −$270 | +$80 | −$490, still holding |
Most of this loss was built when you sold a call below your cost. Ex-date risk is what locked it in early, and it took the $80 dividend with it. Buying the call back doesn't escape it either. It just swaps a locked-in loss for a paper loss on shares you still hold. A math example, not a promise.
Why it matters for sellers
If you sell covered calls on dividend stocks in the wheel strategy, put every ex-date in your calendar. The night before, check any call that's in the money. If its time value is below the dividend, decide on purpose: let it go, buy it back, or roll it out to a date with more time value.
The best defense is a strike you'd be happy to sell at on any day, ex-date or not. Avoid strikes below what you paid unless you've already accepted that loss.
Questions
How do I know if my call will be assigned before the ex-date?
Work out the time value: the call's price minus how far it's in the money. If that's smaller than the dividend, early exercise makes sense for the holder. It isn't certain, but plan for it.
Do I get the dividend if I'm assigned the day before?
No. The shares are gone before the ex-date, so the dividend goes to whoever owns them.
Does ex-date risk apply to puts?
Not in the same way. A coming dividend makes early exercise of a put less likely before the ex-date, not more.
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