Those who sponsor Visa for internship.
yes cisco does it. i see lots of international students at my floor
Everyone
Not everyone. Got rejected by three due to visa issue.
Which ones
Why do you need a visa for internship? Are you on F1? If so, you should be able to talk to international advisor and get approval for visa.
Not in USA.
Google, Microsoft, Facebook, Amazon, Palantir definitely do. If you're a student outside the US the visa type to ask them about is called J-1
Genentech does