S&P 500 (SPX) above ___ end of March? is a active prediction market event on Polymarket with 7 markets, $14.6K total volume, and $2.3K in liquidity. Key markets: Will S&P 500 (SPX) close over $7,100 on the final trading day of March 2026?; Will S&P 500 (SPX) close over $7,000 on the final trading day of March 2026?; Will S&P 500 (SPX) close over $6,900 on the final trading day of March 2026?.