The latest broad market rally has pushed the tech-heavy Nasdaq Composite Index to new record highs above the 11,000 milestone. The Nasdaq's march from 10,000 to 11,000 has been the fastest-ever in 20 years. The benchmark hit 10,000 on June 10 and took 40 trading days to climb to the 1,000 point.With this, the Nasdaq Composite soared more than 60% since hitting a Mar 23 low, outperforming the other major indices. The S&P 500 and the Dow Jones Industrial Average index have climbed 50% and 47%, respectively. Most of the gains were driven by surging technology stocks, especially the mega-cap and the so-called FAANG stocks. These tech companies strengthened on stay-at-home trends (read: Best & Worst ETF Areas of July).Better-than-expected earnings and unprecedented stimulus have added to the strength, leading to a spike in stocks. Additionally, hopes of more stimuli and the positive development in coronavirus vaccines by a number of biotech and pharma companies instilled confidence.As a result, Invesco QQQ QQQ, which serves as a proxy to the index, has gained 29.7% so far this year. Let’s take a closer look at the fundamentals of QQQ.QQQ in FocusThis ETF provides exposure to the 103 largest domestic and international non-financial companies listed on the Nasdaq by tracking the Nasdaq 100 Index. Information technology accounts for 48.3% of the assets, while communication services and consumer discretionary holds 19.3% and 18.2% share, respectively. QQQ is one of the largest and most-popular ETFs in the large-cap space with AUM of $126.8 billion and average daily volume of around 37.5 million shares. It charges investors 20 bps in annual fees. The fund has a Zacks ETF Rank #1 (Strong Buy) with a Medium risk outlook.Though most of the stocks in the fund’s portfolio have delivered strong returns so far this year, a few are the real stars, having gained more than 50%. Below we have highlighted the 10 best-performing stocks in the ETF with their respective positions in the fund’s basket:Top-Performing Stocks in QQQTesla Inc. TSLA: This company designs, produces and sells electric cars, solar energy generation systems and energy storage products. The stock has surged nearly 256% this year and has 2.4% exposure in the fund’s basket. Its earnings are expected to increase to $8.66 per share this year from 13 cents reported last year. Tesla has a Zacks Rank #3 (Hold) (read: ETFs to Surge as Tesla Turns to Profit, Secures S&P 500 Entry).DocuSign Inc. DOCU: This company provides e-signature solutions offering services to mortgage, non-profit, government, real estate, insurance, technology and healthcare industries. This stock makes up for 0.4% share in the fund’s basket and has delivered robust returns of 191% this year. It has an expected earnings growth rate of 48.4% for the fiscal year (ending Jan 2021). The stock has a Zacks Rank #3.MercadoLibre Inc. MELI: This is one of the largest e-commerce platforms in Latin America. The stock has climbed 113.3% this year and has an expected earnings growth rate of 74.4%. MercadoLibre has a Zacks Rank #2 (Buy) and accounts for 0.5% of the fund.DexCom Inc. DXCM: This medical device company is focused on the design, development and commercialization of continuous glucose monitoring systems. DexCom has risen 100.7% so far this year and holds 0.4% share of the basket. It has an estimated earnings growth rate of 42.9% for this year and a Zacks Rank #3.NVIDIA Corporation NVDA: It is the worldwide leader in visual computing technologies and the inventor of the graphic processing unit, or GPU. The stock has a projected earnings growth rate of 36.4% for the fiscal year (ending Jan 2021) and has rallied 92.7% so far this year. It accounts for 2.5% of the fund’s portfolio and has a Zacks Rank #3.Advanced Micro Devices Inc. AMD: This semiconductor company has emerged as a strong contender to NVIDIA’s dominance in the graphic processing unit market based on its Radeon technology. The stock has surged about 89% so far this year. It has a massive earnings growth rate of 71.9% for this year. Advanced Micro Devices makes up for 0.9% share in QQQ and carries a Zacks Rank #3 (read: Semiconductor ETFs in Focus as AMD Soars).PayPal Holdings Inc. PYPL: This company is one of the largest online payment solutions providers. It has an expected earnings growth rate of 18.7% for this year and a Zacks Rank #2. PayPal makes up for 2.1% allocation and has delivered robust returns of 88.6% this year so far.JD.com Inc. JD: It operates as an online direct sales company in China. For this year, the company has an expected earnings growth rate of 20.2% and its shares have jumped 84.2% so far. It carries a Zacks Rank #1 (Strong Buy) and accounts for 0.5% share. You can see the complete list of today’s Zacks #1 (Strong Buy) Rank stocks here.Amazon.com Inc. AMZN: It is one of the largest e-commerce providers with extensive operations in North America and a rapidly increasing reach across the globe. The stock has risen 74.5% so far this year. Zacks Rank #3 Amazon has projected earnings growth of 39.1% for this year.Regeneron Pharmaceuticals Inc. REGN: This biopharmaceutical company is focused on the discovery, development and commercialization of treatments targeting serious medical conditions. It has gained 65.4% so far this year and has an estimated earnings growth rate of 14.3% for the full year. The stock accounts for 0.6% of assets in QQQ and has a Zacks Rank #4.Want key ETF info delivered straight to your inbox?Zacks’ free Fund Newsletter will brief you on top news and analysis, as well as top-performing ETFs, each week. Get it free >> Want the latest recommendations from Zacks Investment Research? Today, you can download 7 Best Stocks for the Next 30 Days. Click to get this free report NVIDIA Corporation (NVDA): Free Stock Analysis Report Amazon.com, Inc. (AMZN): Free Stock Analysis Report Regeneron Pharmaceuticals, Inc. (REGN): Free Stock Analysis Report DexCom, Inc. (DXCM): Free Stock Analysis Report Advanced Micro Devices, Inc. (AMD): Free Stock Analysis Report Tesla, Inc. (TSLA): Free Stock Analysis Report Invesco QQQ (QQQ): ETF Research Reports JD.com, Inc. (JD): Free Stock Analysis Report MercadoLibre, Inc. (MELI): Free Stock Analysis Report PayPal Holdings, Inc. (PYPL): Free Stock Analysis Report DocuSign Inc. (DOCU): Free Stock Analysis Report To read this article on Zacks.com click here. Zacks Investment Research Want the latest recommendations from Zacks Investment Research? Today, you can download 7 Best Stocks for the Next 30 Days. Click to get this free report