Amazon seems to get moved to the back burner when discussing Apple and Google. But that is not because it is not dominant in its own right. The company is without question one of the best tech stories today. Not only is it a wonderful company but, in my opinion, it has one of the top three visionary CEOs in Jeff Bezos. The company has always demonstrated a commitment to tackle new markets and to seek growth opportunities. The only concern for investors has been with its stock price, one that has been expensive now for quite some time. However, the company has shown an ability to overcome the pressures of expectations and has not only met them but continues to exceed them. So an argument can be made that perhaps the stock has not been that expensive after all. As perfect as it must be to maintain its lofty valuation, it seems the company is executing to perfection. In terms of reported sales, there aren't many companies the size of Amazon producing the level of growth it has demonstrated. I don't see this suddenly changing, especially as it seeking to launch a bigger Kindle tablet along with a smartphone. As with Apple, Google and Microsoft, Amazon continues to push the envelope to seek new markets and maintain its growth trajectory to return value to its investors. The next four years will be a critical time for each of these companies, a time of getting through a possibly saturated mobile device market and furthering their respective cloud strategies. What is clear is they will be four of the most dominant names within not only the tech sector, but in the entire market. Investors would be wise to make certain that they are anchors within their portfolios. Follow @rsaintvilusAt the time of publication, the author was long AAPL and held no position in any of the other tocks mentioned. This article is commentary by an independent contributor, separate from TheStreet's regular news coverage.Richard Saintvilus is a private investor with an information technology and engineering background and has been investing and trading for over 15 years. He employs conservative strategies in assessing equities and appraising value while minimizing downside risk. His decisions are based in part on management, growth prospects, return on equity and price-to-earnings as well as macroeconomic factors. He is an investor who seeks opportunities whether on the long or short side and believes in changing positions as information changes.