Both the Dow Jones and S&P 500 ended the month down by more than 3%.

Shares of hamburger chain Shake Shack sizzled on Friday following its IPO while Amazon’s rallied after a strong earnings report. But a few bright spots couldn’t ward off another day of losses for the stock market, which closed out January in the red.

Concerns about weak domestic economic growth weighed down the market on Friday after the Commerce Department said that U.S. gross domestic product grew at a lower-than-expected annual rate of 2.6% in the fourth quarter of 2014 — down from 5% during the previous quarter. Friday also brought renewed concern over economic stability in Europe, where Greece’s new finance minister said the country would not negotiate new bailout terms with the European Union and International Monetary Fund.