SPX vs SPXW Options: A.M. vs P.M. Settlement

Q: What is the difference between SPX and SPXW options?

Both are cash-settled, European-style options on the S&P 500 index. Standard A.M.-settled SPX contracts use the SET opening calculation and generally stop trading the prior business day. SPXW identifies weekly and other P.M.-settled series that generally use the expiration-day closing value.

Q: What is the SPX options settlement price?

It depends on the series. Standard A.M.-settled SPX options use a special opening quotation published under SET, built from the official opening price of each S&P 500 component. P.M.-settled SPXW series use the index's closing value under their contract specifications.

Q: What is the difference between A.M. and P.M. SPX settlement?

A.M.-settled standard series settle from an opening-price calculation on expiration morning and generally stop trading the prior business day. P.M.-settled SPXW series settle from the expiration day's closing value and generally trade on that day.

Q: Are SPX options cash settled?

Yes. In-the-money value is converted to dollars using the $100 contract multiplier. No S&P 500 shares are delivered because the SPX index is not a shareholding.

Q: Can SPX options be assigned early?

No. SPX options are European-style, so exercise occurs only at expiration. A trader can still close a position before expiration by trading an offsetting order.

By VantureCap · Published July 30, 2026 · Updated August 13, 2026 · 8 min read

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SPX options are European-style and cash-settled, but not every SPX expiration uses the same settlement moment. Some standard contracts use a special Friday-morning opening calculation; many SPXW daily, weekly, and end-of-month contracts use an expiration-day closing value. The series label changes which market move decides the final cash amount.

SPXW is not a different index. Both SPX and SPXW options derive their value from the S&P 500 index, use the same $100 multiplier, settle in cash, and use European exercise. The label distinguishes expiration series and, most importantly for a trader holding through expiration, their settlement convention and last trading window.

SETspecial opening quotationstandard A.M.-settled SPX
Closeexpiration-day index closeP.M.-settled SPXW
× $100contract multipliercash value per index point
No sharescash settlementEuropean exercise

Do not infer settlement style from the weekday alone. SPX lists multiple expiration series. Confirm the exact symbol, expiration, A.M./P.M. designation, last trading time, and broker cutoff before entering the trade.

SPX vs SPXW at a glance

Feature	Standard A.M.-settled SPX	P.M.-settled SPXW
Typical series	standard third-Friday monthly	daily, weekly, and end-of-month series
Settlement input	special opening quotation, symbol SET	expiration-day closing index value
Opening or closing prices?	official opening price of every S&P 500 component	closing value under the series specification
Last trading day	generally the business day before expiration	generally the expiration day
Delivery	cash	cash
Exercise style	European	European

Why SET is not simply the SPX opening print

For a standard A.M.-settled contract, S&P calculates a special opening quotation from each constituent stock’s official opening trade on its primary exchange. Those 500 stocks do not all open at the same instant. SET is published only after the required opening prices are established.

That makes SET a different calculation from the real-time SPX index you see shortly after the bell. Cboe notes that SET can differ from the displayed open and, in some expiration sessions, can even fall outside that day’s later high-low range. The trade stopped changing when its last trading session ended, but the settlement input had not yet been calculated.

Thursday close

The last visible market for a standard A.M.-settled Friday expiration is generally the prior business day.

Friday SET

The final exercise value comes from Friday component opening prices. A gap can change the result after the option has stopped trading.

Where the A.M.-settlement risk lives

you can still tradefrozen, but the market is notSET being calculated

The risk sits in the middle span: after the Thursday close the position is locked, but the settlement input does not exist until the components open on Friday. A gap in between changes the result of a trade you can no longer touch. Schematic timeline, no dates or prices. P.M.-settled SPXW series close this gap by settling to the expiration day's closing value instead.

How cash settlement works

At expiration, each in-the-money SPX option receives intrinsic cash value. Out-of-the-money options expire with zero intrinsic value. The $100 multiplier converts index points into dollars:

call settlement value = max(settlement − strike, 0) × $100
put settlement value = max(strike − settlement, 0) × $100

No shares appear. For a vertical spread, calculate both legs at the same official settlement value, net them, then include the opening credit or debit to get the expiration P&L.

Worked A.M.-settled put-spread example

Suppose a bull put spread is short the 6,000 put, long the 5,950 put, and collected 6.00 points = $600. Friday’s official SET value is 5,972.

Line item	Calculation	Cash result
Short 6,000 put	(6,000 − 5,972) × $100	−$2,800
Long 5,950 put	max(5,950 − 5,972, 0)	$0
Opening credit	6.00 × $100	+$600
Net P&L	$600 − $2,800	−$2,200

The long put still matters even though it expires worthless in this example. If SET were below 5,950, the long leg would gain value and cap the spread’s loss at $4,400.

Worked P.M.-settled call example

Suppose one 6,020 call is held through a P.M.-settled expiration and the official closing settlement value is 6,027.50. Its intrinsic cash value is:

(6,027.50 − 6,020) × $100 = $750 ← cash settlement value before the original premium

That $750 is not automatically profit. Subtract the premium paid for the call, or combine both legs and the net debit or credit if it was part of a spread.

Knowledge check: SET prints at 5,972 — what does the 6,000/5,950 put spread from the example above actually lose?

Work the legs at the same settlement value. The short 6,000 put owes (6,000 − 5,972) × $100 = $2,800; the long 5,950 put is out of the money and pays $0; the opening credit keeps +$600. Net: −$2,200. And note what did not matter: where SPX traded on Thursday afternoon. Only the Friday-morning SET decides an A.M.-settled contract.

Five checks before holding SPX into expiration

Read the full series description.
Confirm standard SPX or SPXW and the exact expiration date.
Confirm A.M. or P.M.
Do not rely on the weekday or a remembered convention.
Confirm the last trading time.
The option may stop trading before the settlement value is known.
Calculate both legs.
Use the same official settlement value and the $100 multiplier.
Check broker procedures.
Cutoffs, display labels, and expiration handling can differ.

SPX vs SPXW settlement FAQ

What is the difference between SPX and SPXW options?

Both reference the S&P 500 index. Standard A.M.-settled SPX contracts use SET and generally stop trading the prior business day; P.M.-settled SPXW series generally use the expiration-day closing value and trade on that day.

What is the SPX options settlement price?

Standard A.M. series use SET, a component-opening calculation. P.M.-settled SPXW series use the expiration-day closing value under their specifications.

What is the difference between A.M. and P.M. settlement?

The final input comes from opening prices for A.M. contracts and a closing value for P.M. contracts; their last trading days also generally differ.

Are SPX options cash settled?

Yes. Intrinsic value becomes cash using the $100 multiplier; no shares move.

Can SPX options be assigned early?

No. SPX uses European exercise, although a trader can close the contract before expiration with an offsetting trade.

Authoritative references

Practice SPX expiration scenarios →10 free rounds a session · real market history · no signup

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Practise this on real history: the trainer deals these structures on seventeen decks, and every one has a page showing how they actually settled — SPX, SPY, TSLA and GLD among them. The same structure behaves differently on an index than on a single stock, which is easier to see side by side than to be told. Compare the decks.

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Playbook Trainer is an educational game built on historical market data. Nothing on this page is investment advice or a recommendation to trade. Options involve substantial risk; defined-risk spreads can lose their full maximum loss. Scenario dates are masked, and prices reflect historical option quotes with simplified fills.