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← Back to Research | 0DTE Algo Execution Aug 01, 2026 1 min read

SPX vs. QQQ Options Market Structure: Key Differences for Scalpers

A comparison of cash-settled SPX index options versus equity-settled QQQ ETF options for active intraday traders.

While SPX and QQQ often exhibit strong positive correlation, their underlying options market structures differ significantly. SPX features European-style, cash-settled contracts with 60/40 tax treatment, whereas QQQ features American-style physical delivery contracts susceptible to early exercise risk.

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