Although Nvidia (NASDAQ: NVDA) provided a streak of impressive earnings quarters, the upward momentum of Nvidia stock was stopped by profit-taking, concerns regarding export restrictions to China, and valuation concerns.On January 8, the stock had its worst trading day in 5 months — having shed 6.22% of its value to close at $140.14.At press time, NVDA shares were trading at a price of $138.06, having marked a 0.90% loss on the weekly chart. NVDA stock price 1-month chart. Source: FinboldWhile the Jensen Hu ...