Baker Hughes Co BKR.O tumbled 8.3% as the largest S&P percentage loser, as the oilfield services provider reported a bigger second-quarter loss, while its adjusted profit also missed estimates. By Echo Wang July 20 (Reuters) - U.S. stocks ended higher on Wednesday with the tech-heavy Nasdaq booking a 1.6 % gain on positive earnings signals with a wary eye on inflation and more interest rate hikes by the Fed. Runaway inflation initially led markets to price in a full 100-basis-point hike in interest rates at the Fed's upcoming meeting next week, until some policymakers signaled a 75-basis-point increase.