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2006issue C101

Call credit spread execution, leftover premium and expiration decay

Listed options and employee-grant options are different contracts, so grant-timing investigations do not rewrite listed-option mechanics. A call credit spread is then a three-state procedure: open for a net credit, hold so both calls expire, or flatten with a closing debit. Leftover time value and daily decay remain separate inputs when short-strike moneyness forces an early close.

  • Listed options and employee-grant options are different contracts, so grant-timing investigations do not change day-to-day listed-option mechanics.
  • A call credit spread opens as a net credit, is meant to be held so both calls expire, and can be flattened with a closing debit if the underlying rises.
  • Time value is leftover premium above intrinsic value, while theta measures expected daily decay. The two readings generally will not match.
  • In the mid-June illustration, an early close one week before July expiration, with the underlying at 37, turned a 2.00 opening credit into a 0.35 net loss.
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Current trackOption expiration analysis38 readingsOption premium analysis103 readingsOption spread138 readings

Listed options are not employee-grant options

Listed options are standardized exchange-traded contracts bought and sold independently of employer compensation awards. Employee-grant options are company-awarded compensation contracts whose grant date and strike are set by the employer, not by an options exchange. The two are different contracts, so grant-timing investigations do not change the day-to-day mechanics of listed-option strategies.

A grant-timing investigation can still affect a strategist indirectly if they already hold a position in that company and the share price reacts to the news.

A call credit spread has three states

A call credit spread is opened by selling one call and buying another call with a higher strike so the opening cash flow is a net credit. The intended hold path is that the underlying stays in a range or declines so both calls expire and the opening credit is retained.

If the underlying rises, the spread can be flattened before expiration by buying back the short call and selling the long call. That early close produces a closing debit equal to the short-call repurchase price minus the long-call sale price.

The mid-June credit and the July early close

In the supplied mid-June illustration, selling a 35-strike call at 2.50 and buying a 40-strike call at 0.50 opens the spread for a 2.00 credit.

With the underlying at 37 one week before July expiration, buying the 35-strike call at 2.45 and selling the 40-strike call at 0.10 produces a 2.35 debit and a 0.35 net loss versus the opening credit. The underlying then sits above the sold 35 strike.

Time value and theta are different readings

Time value is option price minus intrinsic value, while theta measures expected daily decay. The two quantities are not the same and generally will not match.

With the underlying at 37, a 35-strike call priced at 2.45 has 2.00 of intrinsic value and 0.45 of time value. A theta of 0.10 implies a 0.10 decline the next day if the stock is unchanged.

Editorial reading of the execution loop

Editorial reading: listed-option execution is one testable loop. First keep employee-grant news from rewriting the listed-option rule set. Then specify the call credit spread as open, hold to expiry, or flatten. Then read leftover premium and daily decay separately if short-strike moneyness forces an early close.

Educational research material, not investment advice. Historical source context does not establish present-day performance.
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20061-1 pp.Next on Option expiration analysisExpiration-aware call construction and automatic exerciseA call buyer holds a right, not an obligation, and can lose no more than the premium paid for the contract.
All readings on this track · 23 readings
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  4. 2004Index option execution through expiration and volatility context
  5. 2005Constructing credit spreads around settlement and implied volatility
  6. 2006Call credit spread execution, leftover premium and expiration decay
  7. 2006Expiration-aware call construction and automatic exercise
  8. 2007Expiration, leftover premium, and seasonal context for option construction
  9. 2007Seven option mistakes in premium, expiration, and implied volatility
  10. 2008Long straddle construction around implied volatility and expiration
  11. 2008Option income critiqued through volatility and expiration
  12. 2011Covered call writing as income holding or buy-write turnover
  13. 2011A five-day Treasury bond option sale as a market-regime choice
  14. 2011Session-access gaps, expiration exercise, and spread coverage
  15. 2011Weekly option tenor construction and premium drivers
  16. 2012PM-settled index expiration in a defensive sector regime
  17. 2014Weekly covered-call income and the expiration hold test
  18. 2016Weekday option expirations as a catalyst-timing overlay
  19. 2017Overlapping condors and expiration windows
  20. 2017Small-cap index futures listing change as a margin and options checkpoint
  21. 2017Pin risk as an expiration-day execution problem
  22. 2019Stock, index, and futures options as a capital and expiration filter
  23. 2020Dividend early assignment risk for short calls
By fieldOptions and volatility435 readingsBy year2006150 readings
All 38 readings tagged Option expiration analysis
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