Cummins ( CMI) was among the NYSE's losers Thursday, with shares plunging 20% after the engine and components maker missed Wall Street's third-quarter earnings targets.Cummins earned $184 million, or $1.84 a share, for the quarter, up 7.6% from a year earlier. Analysts polled by Thomson Financial expected earnings of $1.95 a share. Sales rose 20% to $3.37 billion, topping analysts' target of $3.22 billion. The company said it is on pace to meet its full-year profit forecast of $7.15 to $7.65 a share, which is slightly below analysts' target of $7.70 a share. Shares were sliding $26.96 to $106.77. Shares of Big Lots ( BIG) sank 15% after the discount retailer cut its third-quarter sales forecast, even though it backed its profit guidance. Big Lots said it now expects a slight drop in same-store sales, or sales open at least a year, for the quarter. Previously, it projected a 1% to 3% rise. Big Lots said it has seen significant operating improvement due to inventory management and cost controls, so it expects earnings for the period to be at the high end of its prior guidance of 9 cents to 13 cents a share. Nonetheless, shares were losing $4.18 to $23.34. Terex ( TEX) shares dropped 9% after the industrial manufacturer posted third-quarter results below Wall Street's expectations. Terex earned $151.5 million, or $1.45 a share, on sales of $2.20 billion. Analysts, on average, expected earnings of $1.47 a share and sales of $2.21 billion. For the full year, Terex backed its prior view for earnings of $5.50 to $5.70 a share and sales of $8.8 billion to $9 billion. Shares were falling $7.33 to $75.60.