Semiconductor stocks fell on Tuesday, pressuring the overall technology sector as chipmakers retreated from their best session in more than two years. The PHLX Semiconductor Index SOXX, -2.16% lost 0.8%. On Monday, the index spiked 4.2%, its biggest one-day jump since January 2016. Among the biggest decliners in the industry on Tuesday, Nvidia Corp. NVDA, -7.38% fell 4.1% while Advanced Micro Devices AMD, -3.39% was off 2.6%. The two comprised the two largest percentage decliners among components of the Technology Select Sector SPDR ETF XLK, -1.75% the largest exchange-traded fund to track the tech sector, which fell 0.5%. The weakness in tech pressured the Nasdaq Composite Index COMP, -1.56% which fell 0.5%. The Dow Jones Industrial Average DJIA, -0.05% rose 0.6% and the S&P 500 SPX, -0.50% was up 0.1%. Despite the day's retreat, the semiconductor index remains up 9.2% for 2018.