Since they are all based in California now, I would think yes. But since Larry and Sergey Bin are both from Stanford, I'd expect a disproportionate number of Stanford grads at Google.

In any case, one way universities market themselves is by looking at the average income of their alumni. Since Harvard grads often end up on Wall Street, I would not be surprised if Harvard comes up on top.

But you could argue that's just the financial industry connection. What if you restrict your search on science and engineering majors? Well then we already know MIT and Caltech are better.