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SPX vs SPY options: what actually differs

SPX options are cash-settled European-style index contracts roughly ten times the notional of SPY options, which are physically settled American-style contracts on an ETF. The difference decides assignment risk, capital per contract, and how each behaves into expiry.

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What are the core differences?

SPXSPY
UnderlyingS&P 500 indexS&P 500 ETF
Notional per contract~10x SPY~1/10 of SPX
SettlementCashPhysical (shares)
Exercise styleEuropean — expiry onlyAmerican — any time
Early assignmentNonePossible
DividendsNot applicableEx-dividend assignment risk

Why does European exercise matter?

SPX contracts cannot be exercised before expiry, so a short leg cannot be assigned early. Spreads keep their intended shape into the final session, which is why index spreads are the common structure for defined-risk positioning.

Which is better for smaller accounts?

SPY's smaller notional allows finer position sizing, and SPX's larger notional means fewer contracts and fewer commissions for the same exposure. Neither is better in the abstract; it depends on account size and the granularity a strategy needs.

Open interest concentration on SPX is visible on the live open interest page.

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SPX open interest by strike

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SPX open interest by strike · This is where SPX index option positioning sits right now: open interest for calls and puts at the strikes nearest spot, with the put/call ratio at each level. Concentrated open…

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