Stocks have trimmed losses late Tuesday, ahead of the start of the fourth-quarter earnings season. The Dow Jones industrial average and S&P 500 lost 0.5% each. Meanwhile, the Nasdaq was down 0.4%. All three were off by 0.7% at Tuesday's low. Turnover was tracking lower on the Nasdaq and a touch higher on the NYSE. Regeneron Pharmaceuticals (REGN) has cut its earlier 7% loss by half. The drugmaker earlier reported net fourth-quarter sales of $276