Here's a slideshow list of Silicon Valley's most generous corporations; thus far, 2013 giving has jumped nearly 30 percent over last year.
"Silicon Valley's corporate philanthropy tracked the region's economic gains last year, with giving increasing by double-digit percentages. The total contributed by businesses on our List of corporate donors jumped 29.8 percent in 2013 to $102.7 million. That’s compared to an 8.7 percent increase in giving from 2011 to 2012." -- Silicon Valley Business Journal