 Shares of Labcorp LH, 1.03 gained 4.2 in premarket trading on Thursday after beating earnings expectations for the second quarter and announcing plans to spin off its clinical-development business, which provides contract-research organization services, next year. The company reported earnings of 358.6 million, or 3.87 per share, in the second quarter of 2022, compared with 467.4 million, or 4.76 per share, in the same three months of last year. 