Dec '26 SPX Box Spreads

S&P 500 Index (SPX)
updated daily, quoted in USD

Calculate

LongShort

Days to expiry

Spread

Quantity

Commission

Rate

Limit order price

Borrow 100,000 today, repay 100,000 for a cost of 0 on December 18th, 2026

Sell 1 SPX 18DEC26 4000 CALL
Buy  1 SPX 18DEC26 4000 PUT
Buy  1 SPX 18DEC26 5000 CALL
Sell 1 SPX 18DEC26 5000 PUT

Order Book(1 min delay)

Rate	Size	Spread	Price