Shares of Northern Oil and Gas, Inc. NOG surged 9.5% after the company reported first-quarter 2021 earnings of 62 cents per share, surpassing the Zacks Consensus Estimate of 53 cents.Cigna Corporation’s CI shares jumped 1.7% after the company reported first-quarter 2021 earnings of $4.73 per share, surpassing the Zacks Consensus Estimate of $4.42.Shares of EnPro Industries, Inc. NPO rose 2.8% after the company reported first-quarter 2021 earnings of $1.37 per share, beating the Zacks Consensus Estimate of $0.95.American Axle & Manufacturing Holdings, Inc. AXL shares surged 7.4% after the company reported first-quarter 2021 earnings of 57 cents per share, surpassing the Zacks Consensus Estimate of 25 cents.Want the latest recommendations from Zacks Investment Research? Today, you can download 7 Best Stocks for the Next 30 Days. Click to get this free report Cigna Corporation (CI): Free Stock Analysis Report American Axle & Manufacturing Holdings, Inc. (AXL): Free Stock Analysis Report EnPro Industries (NPO): Free Stock Analysis Report Northern Oil and Gas, Inc. (NOG): Free Stock Analysis Report To read this article on Zacks.com click here. Zacks Investment Research