Key TakeawaysSLB stock has lost 15.3%, underperforming the 2.9% gain this year of the oil and gas field services industry.Still, the stock has a premium valuation suggesting the market has confidence in the company - is it warranted?Register now to see our 7 Best Stocks for the Next 30 Days report - free today!SLB (SLB) is currently considered expensive on a relative basis, with the stock trading at a trailing 12-month Enterprise Value to Earnings Before Interest, Taxes, Depreciation and Amortization (EV/EB ...