On an ugly day for markets, here’s the S&P 500 level investors need to watch closely, says this trader By: MarketWatch November 26, 2021 at 07:04 AM EST It's a grim day for traders. Keep an eye on this S&P 500 level, says our call of the day. Read More >> Related Stocks: Amazon.com American Airlines Gp Astrazeneca Plc ADR Delta Air Lines Didi Global Inc ADR Gap Kohl's Corp Moderna Inc Nordstrom Pfizer SPX Target Corp United Airlines Holdings Inc Wal-Mart Stores, Inc.