Top 10 Feeder Schools for 100 Tech Companies

[sanantone]

The reason Harvard, Yale, or MIT didn't make the list is mainly because of their low enrollment figures. 

Harvard undergraduate enrollment is 1662 vs. UCLA at 30,000+

That's partially the reason. Some of these state universities are just ranked higher in computer science and engineering.

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Ranking and location is probably more of a factor than student body size. But, also keep in mind that just because a school has a lot of undergraduate students doesn't mean that it has a lot of computer science, IT/IS, and engineering students. For example, even though UT has almost 10X as many students as MIT, it only has a little over twice as many computer science students. 

Here are the undergraduate enrollments.

Top 10 Feeder Schools

University of Washington - 36,302
Carnegie Mellon - 7,365
Stanford - 7,645
Berkeley - 32,143
USC - 20,790
San Jose State University - 28,288
University of Michigan - 32,282
UT Austin - 40,916
Georgia Tech - 17,477
UIUC - 34,779

Ivy League and MIT

Brown - 7,349
Columbia - 8,148
Cornell - 15,503
Dartmouth - 4,556
Harvard - 7,153
Penn - 9,962
Princeton - 5,321
Yale - 6,536
MIT - 4,638

Universities with most undergraduate students

Arizona State University 64,716 
University of Central Florida 60,075 
Texas A&M University 56,723 
Liberty University (VA) 48,135 
Ohio State University 47,106 
Florida International University 46,079 
University of Maryland Global Campus 45,100 
University of Texas at Austin 40,916 
Pennsylvania State University 40,600 
Utah Valley University 40,542

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The reason Harvard, Yale, or MIT didn't make the list is mainly because of their low enrollment figures. 

Harvard undergraduate enrollment is 1662 vs. UCLA at 30,000+

I'm not sure where you got that figure for Harvard, but Harvard has over 7,000 undergraduate students. They might admit around 1,600 students each year, but you'd have to compare that figure to how many students UCLA admits each year, and UCLA is not admitting over 30,000 students every year.