The settlement price is the official price used to determine final profit or loss on expiring options and futures. For equity options it is typically the closing price; for index options it can be the AM or PM settlement value depending on the contract.
⚡ KEY TAKEAWAY: Cash-settled index options use a settlement price that may differ from the index close. Always know whether your short SPX or NDX options use AM or PM settlement to avoid unexpected assignment outcomes.
Why It Matters
The settlement price is the final arbiter of profit and loss for expiring options. For cash-settled index options, the settlement price can differ materially from any price the index traded during the session, creating unexpected outcomes for premium sellers.
How It Works
Equity options settle to the underlying's closing price (or assigned via stock delivery). Cash-settled index options use either AM or PM settlement. AM settlement calculates a value from individual component opening prices. PM settlement uses the index closing value.
Example
Your short NDX 18000 put expires on monthly expiration. NDX closed Thursday at 18050. Friday's AM settlement uses opening prints of all 100 Nasdaq components, producing a settlement value of 17985. Despite NDX never trading below 18000 on your screen, your put settles $15 ITM, costing $1,500 per contract.
Common Mistakes
Traders hold index options through settlement assuming the closing price determines their outcome. AM-settled options use a calculated value that can deviate significantly from the index close. Always close AM-settled index positions before expiration to avoid settlement risk.
The settlement price is the official price used to determine final profit or loss on expiring options and futures. For equity options it is typically the closing price; for index options it can be the AM or PM settlement value depending on the contract.
Why does Settlement Price matter for premium sellers?
Cash-settled index options use a settlement price that may differ from the index close. Always know whether your short SPX or NDX options use AM or PM settlement to avoid unexpected assignment outcomes.
How does Settlement Price work?
Equity options settle to the underlying's closing price (or assigned via stock delivery). Cash-settled index options use either AM or PM settlement. AM settlement calculates a value from individual component opening prices. PM settlement uses the index closing value.
What are common mistakes with Settlement Price?
Traders hold index options through settlement assuming the closing price determines their outcome. AM-settled options use a calculated value that can deviate significantly from the index close. Always close AM-settled index positions before expiration to avoid settlement risk.
