Shares in Cal-Maine Foods ( CALM) jumped in premarket trading Monday after the food company said third-quarter profit tripled. The Mississippi-based egg producer had net income of $23.9 million, or $1.96 a share, on revenue of $165.7 million, vs. $7.6 million, or 64 cents a share, on revenue of $106.8 million, a year ago. There was no consensus estimate of analysts available. Shares rose $3.06, or 7.5%, to $43.11 before the opening bell. "Our strong revenue growth and improved profitability over the prior-year period reflects a much more favorable egg market and continued good performance in our operational efficiencies," the company said in a statement. "The demand for eggs continues to be very strong, and we believe that Cal-Maine is well positioned to benefit from this trend for the remainder of our fiscal year." The quarter included an after-tax charge of $6.1 million, or 50 cents a share, for stock compensation.