The Zacks Analyst Blog Highlights: Alphabet, Tesla, Costco, Applied Materials and NVIDIA. : Wall Street continues its dream run for 2021, with just six weeks left this year. Although the rally is broad-based, market participants are surprised with the performance of Nasdaq Composite. The tech-heavy index had an astonishing rally in the pandemic-ridden 2020. However, in the beginning of 2021, several economists and financial experts were skeptical about Nasdaq Composite due to the stretched valuation of the technology sector. The Nasdaq Composite itself has witnessed a broad-based rally so far this year.