Technology companies and startups throughout Silicon Valley may see a talent drain because of Trump’s immigration policies. The industry relies heavily on immigrants, and over half of all tech startups in the U.S. have CEOs or founders who are immigrants. Additionally, approximately two-thirds of employees working in the United States’ mathematics or computer industries are also immigrants.
See "Tump Win is Silicon Valley’s Loss on Immigration", Shira Ovide, Bloomberg Technology, November 11, 2016