On the upside
Strong growth of manufacturing activity in China in December lifted shares of Cliffs Natural Resources (NYSE: CLF).
Three Amyris (Nasdaq: AMRS) directors purchased significant shares of company stock.
On the downside
Savient Pharmaceuticals (Nasdaq: SVNT) director Lee S. Simon, M.D. resigned. Cal-Maine Foods (Nasdaq: CALM) disappointed with sharply lower second quarter earnings as expenses climbed.
Motley Fool wrote that Rite Aid (NYSE: RAD) was a speculative investment among retail drugstore chains.
In the broad market, advancing issues outpaced decliners by a margin of 9 to 2 on the NYSE and by more than 4 to 1 on Nasdaq. The broader S&P 500 index surged 23 points to 1426.