How much a stock's price changes over time is important for most investors, since price performance can both impact your investment portfolio and help you compare investment results across sectors and industries.The fear of missing out, or FOMO, also plays a factor in investing, especially with particular tech giants, as well as popular consumer-facing stocks.What if you'd invested in DexCom (DXCM) ten years ago? It may not have been easy to hold on to DXCM for all that time, but if you did, how much would your investment be worth today?DexCom's Business In-DepthWith that in mind, let's take a look at DexCom's main business drivers. San Diego, CA-based DexCom, Inc. is a medical device company focused on the design, development and commercialization of continuous glucose monitoring systems (CGM). These are for ambulatory use by people with diabetes and by healthcare providers for the treatment of diabetic and non-diabetic patients.A key element of DexCom’s monitoring system technology is the continuous measure of patient's blood glucose level and transmission of that information to a small cell phone-sized receiver in real time. The company’s monitoring systems aim to provide real-time continuous blood glucose values, trend data and alerts to assist patients in managing their blood glucose levels.Going by an article of Research and Markets, the blood glucose monitoring devices market is expected to witness a CAGR of over 9% between 2018 and 2024.2020 at a GlanceFor the full-year 2020, the company reported adjusted EPS of $3.10, up 68.5% from 2019. Full-year 2020 revenues came in at $1.93 billion, up 30.5% year over year.Sensor & other revenue were $1.56 billion (81% of net revenues). Hardware revenues were $365.3 million (19% of net revenues).HighlightsThe first quarter of 2021 marked the company’s seventh consecutive quarter of revenue growth of $100 million or more. Moreover, the company witnessed about 40% global unit volume growth in the quarter, thereby indicating sustained customer growth in the business.Bottom LineWhile anyone can invest, building a lucrative investment portfolio takes research, patience, and a little bit of risk. If you had invested in DexCom ten years ago, you're probably feeling pretty good about your investment today.According to our calculations, a $1000 investment made in September 2011 would be worth $47,197.59, or a 4,619.76% gain, as of September 13, 2021. Investors should keep in mind that this return excludes dividends but includes price appreciation.In comparison, the S&P 500 gained 286.28% and the price of gold went up -5.37% over the same time frame.Going forward, analysts are expecting more upside for DXCM. DexCom exited the second quarter on a strong note, wherein both earnings and revenues beat the Zacks Consensus Estimate. Impressive contribution from the Sensor and other revenue segment, and domestic and international revenue growth were key catalysts. Expansion in both gross and operating margins is a positive. DexCom’s prospects in alternative markets such as the non-intensive diabetes management space are likely to provide it a competitive edge in the MedTech space. Apart from making continued advancements with respect to key strategic objectives, the company ended the quarter with new patient additions as well. Yet, DexCom faces stiff competition in the market for blood & glucose monitoring devices. Reimbursement risk and supply constraints are other headwinds. Over the past one year, DexCom has underperformed the S&P 500. Shares have gained 11.80% over the past four weeks and there have been 10 higher earnings estimate revisions for fiscal 2021 compared to none lower. The consensus estimate has moved up as well. Tech IPOs With Massive Profit Potential: Last years top IPOs surged as much as 299% within the first two months. With record amounts of cash flooding into IPOs and a record-setting stock market, this year could be even more lucrative. See Zacks’ Hottest Tech IPOs Now >>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 DexCom, Inc. (DXCM): Free Stock Analysis Report To read this article on Zacks.com click here. Zacks Investment Research