10. SK Hynix
- Market cap: $379.47 billion* (as of April 2)
- Revenue (TTM): $64.3 billion*
- Gross profit (TTM): $38.9 billion*
- Five-year annualized return: 42.6%
- Year founded: 1983
*Converted from South Korean won.
SK Hynix (OTC:HXSCL) is one of the world's leading memory makers and semiconductor suppliers. While based in South Korea, this company also has production sites in China and research and development (R&D) facilities in the U.S., Taiwan, Italy, and Belarus.
Recent success with AI memory chips has driven significant growth for SK Hynix. In 2025, it overtook rival Samsung in operating profit for the first time.
Technology sector takeaways for investors
The tech sector is an exciting one, and it's not unusual for companies in this sector to deliver market-beating returns. Most companies on this list have outperformed the S&P 500 over the last five years. Nvidia, Broadcom, and Micron have done particularly well, largely due to their crucial roles in AI chips and memory. The tradeoff is that tech stocks tend to be volatile and frequently trade at high valuations.
There's a greater risk associated with investing in tech stocks, and it's important to carefully research growth prospects for any you're considering. Even with the risk, technology companies are well worth it for the potential returns. After all, many of the world's most successful companies are in the tech sector.