[BirdieNZ]

Wikipedia says in 2022 there were 4.4 million software developers in the USA. H1bs are ~85,000 added per year. Say over the last 20 years, every h1b slot was filled (by software developers), they never left the USA, and remained on h1b without becoming permanent residents or citizens. That would be 1.7 million H1b software developers currently working.

In reality a large amount become permanent residents or leave. However, FAANG and FAANG-adjacent are probably only around 1 million employees (not including Amazon's non-AWS workforce, but including non-USA employees). Still, FAANG+ are unlikely to be typically anywhere near 80%+ active H1b visa employees. Maybe AWS is a standout exception.

Now, how many software developers in FAANG+ are not born in the USA might be a very different story.