How the S&P 500 experts got it wrong in 2015 By: CNBC.com News January 01, 2016 at 06:26 AM EST Proving that forecasting isn't all plain sailing, analysts from the world's biggest banks had mixed success with their predictions for the S&P 500. Read More >> Related Stocks: Goldman Sachs Group Sentinelone Inc Cl A Societe Generale Spo ADR