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2020issue C0616-20

Dividend early assignment risk for short calls

A pending dividend raises early assignment risk on a short in-the-money call unless remaining time value exceeds the dividend. Pre-dividend call quotes can cheapen, so same-strike put time value and open-interest drops are the practical gauges.

  • Early assignment risk rises when a short call is in the money and remaining time value is low, and a pending dividend raises that risk further unless remaining time value exceeds the dividend.
  • A call with 30 or more days to expiration often still has time value larger than a typical dividend, while that comparison becomes much tighter in the final weeks or days.
  • Pre-dividend quoted call time value is not a reliable assignment gauge; same-strike out-of-the-money put time value is the cleaner read of true in-the-money call time value.
  • If remaining call time value is not above the dividend, the practical choices are to close, roll to a higher strike, or roll farther in time.
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Current trackOption expiration analysis38 readingsOpen interest analysis130 readingsImplied volatility analysis176 readings

A checkpoint for short-call sizing

Editorial: TradersWeek treats an approaching ex-dividend date as a risk-and-sizing checkpoint for covered-call writers. The question is whether a short in-the-money call still has enough remaining premium relative to the dividend to keep, reduce, or roll the position, using option prices, implied volatility, and position context to place that single trade inside a broader market and dividend regime.

When early assignment risk rises

When a short call is in the money and remaining time value is low, early assignment risk rises. A pending dividend raises that risk further unless remaining time value exceeds the dividend.

Reading days to expiration, moneyness, and the ex-dividend date versus expiration is how that rise is judged. A call with 30 or more days to expiration often still has time value larger than a typical dividend, while that comparison becomes much tighter in the final weeks or days.

Quoted call time value can mislead

On the ex-dividend date the stock is marked down by the dividend. In one 2019 case a 1.17 cash amount corresponded to an overnight mark from 85.95 to 84.78.

Because market makers price in the coming markdown, calls that expire after the ex-date tend to cheapen and puts tend to richen. Pre-dividend quoted call time value is not a reliable assignment gauge.

Away from a dividend, same-strike call and put time values line up. With a pending ex-date, same-strike out-of-the-money put time value is the cleaner read of true in-the-money call time value.

After the dividend adjustment

After the dividend adjustment, in-the-money call time values normalize and option prices reflect the lower stock level. At-the-money prices need not fall in line with delta because implied volatility can rise.

Implied volatility around the dividend event is how to interpret that gap. In one post-ex-date example, an 85-strike call with 31 days left moved from 1.54 at 11.54% implied volatility to 1.61 at 18.08% implied volatility.

Open interest around the ex-date

Open interest in in-the-money calls dropped sharply after recent ex-dividend dates, consistent with widespread exercise or closing. Not every contract with time value below the dividend disappeared.

Changes in call open interest around an ex-dividend date serve as a filter for whether holders exercised or closed in-the-money contracts.

Philip Morris call open interest before and after the $1.17 dividend

In-the-money December 2019 Philip Morris calls were largely exercised or closed into the $1.17 ex-dividend: open interest at strikes 82.50 through 85.50 collapsed, while the slightly out-of-the-money 86 strike held. Counts come from the article’s before-and-after open-interest table, with the stock at $85.95 before the adjustment and $84.76 after.
In-the-money December 2019 Philip Morris calls were largely exercised or closed into the $1.17 ex-dividend: open interest at strikes 82.50 through 85.50 collapsed, while the slightly out-of-the-money 86 strike held. Counts come from the article’s before-and-after open-interest table, with the stock at $85.95 before the adjustment and $84.76 after.Philip Morris (PM) · Dec. 20, 2019 expiration · 2019-12-17T00:00:00.000Z to 2019-12-18T00:00:00.000Z

The same table also lists AbbVie January 2020 calls, which show the same in-the-money collapse; only Philip Morris is plotted so the strike axis stays on one name. The article’s prose quotes an opening adjustment of $84.78; the table uses $84.76.

Keep, reduce, or roll

Keeping short-call assignment risk down requires remaining call time value above the dividend. If it is not, the practical choices are to close, roll to a higher strike, or roll farther in time.

Editorial: those choices are the historical workflow for cutting assignment risk, not a ranking of later outcomes.

Educational research material, not investment advice. Historical source context does not establish present-day performance.
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  23. 2020Dividend early assignment risk for short calls
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