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Exercise
The option holder uses the contractual right to buy or sell the underlying according to the contract terms.
Lesson · Options Trading
Exercise, Assignment, and Expiration
Determine how moneyness, holder or writer status, exercise style, share ownership, and brokerage procedures can turn an expiring option into a stock or cash obligation.
Synthetic educational examples
Core concepts
Exercise is the holder’s act; assignment is what it does to a writer; expiration handling is the broker’s.
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Assignment
The writer is selected to fulfill the obligation created by a holder’s exercise.
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Expiration handling
In-the-money standardized options may be exercised by exception, but contrary instructions and brokerage policies can change the result.
Interactive lesson
Choose side, type and style, set the expiration price and the shares you hold, and read what changes hands.
In-the-money by $5.00Standard exercise-by-exception handling may apply, subject to contrary instructions and firm policy.
Exercise: buy 100 sharesCash required at strike: $10,000.
Resulting shares: +100The option position is replaced by the stock transaction if exercised.
Option P/L: +$300Expiration option P/L before fees; stock consequences continue afterward.
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Determine moneynessCompare final underlying price with strike.
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Apply holder or writer roleLong positions may exercise; short positions may be assigned.
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Determine stock or cash settlementThis lab models physically settled equity options.
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Verify broker handlingFirm deadlines, liquidation practices, and exercise instructions can differ.
Manage expiration deliberately
Operational risk can remain even when maximum theoretical loss is defined.
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Identify settlement and style
Confirm physical versus cash settlement and American versus European exercise.
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Review moneyness and extrinsic value
Do not wait until the final minutes to discover an exercise or assignment exposure.
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Check buying power and shares
Know the cash, margin, and deliverable requirements for every possible outcome.
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Submit or close before firm deadlines
Use your broker’s actual instructions and cutoff times rather than assumptions.
Exercise and assignment
Score 0 / 0Choose the best answer.
Lesson rule
Change the inputs, calculate the result, and explain the risk before selecting a contract.
Common mistakes
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Assuming an OTM option can never be exercisedA holder can sometimes provide exercise instructions even when exercise appears economically unusual.
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Ignoring early assignment on short American optionsAssignment can occur before expiration, especially when remaining extrinsic value is low.
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Letting one spread leg expire ITM and the other OTM without reviewAfter-hours movement and separate exercise decisions can leave an unexpected stock position.
Completion standard
✓
Finish when you can say, for any expiring position, whether it is exercised or assigned, what shares or cash move, and which broker step you would verify first.
The drill includes a spread whose legs finish on different sides of the stock; say what you hold on Monday.
Model scope: Theoretical values use a simplified European Black–Scholes model with a fixed 4.5% annual rate and no dividend input, so a number here can be reproduced in any calculator that takes those inputs. Listed products, early exercise, dividends, spreads, fees, and market conditions can produce different prices and outcomes.