Goldman's Kostin: Expect pullback in 4-6 weeks By: CNBC.com News January 12, 2015 at 07:35 AM EST U.S. stock markets will experience a pullback at the end of February, according to David Kostin, Goldman Sachs' chief U.S. equity strategist. Read More >> Related Stocks: Goldman Sachs Group Sentinelone Inc Cl A Societe Generale Spo ADR