Getting interviews at all 3 MBB firms from a non-Ivy

I think you should email an HR if you want a statistic - though I doubt they will tell you.

I got interviews at MBB for summer internships, but did not pass the interviews. I did not get full-time interviews afterwards. (I also went in with very minimal preparation since I already knew at that point I was going to do finance). YMMV

HR wouldnt be able to tell you which of their candidates got interviews at all 3 so dont bother emailing

It's definitely possible with a lot of networking. I go to a large state school and got an interview at MBB as well as one of my friends at school.

In regards to getting a FT interview if you don't get the summer offer, I know someone who made it to the last round with MBB but didn't get the offer. He kept in contact with them over the summer but still got passed up for a FT interview.

Bump

No one is going to be able to answer your first question, but regarding your second, MBB takes much less interns than they will need FT so there's significant FT recruiting and those who already interviewed for summer and did well but didn't get the job are highly encouraged to apply for FT (and often end up receiving a FT offer).

Its definitely possible, but you need to be very tactful. I know a bunch of guys from my school who've done it.

ALso, I'm looking for a case-interview practice buddy if anyone's interested. I'm applying for an MBB internship this fall and I'm starting my prep now. We can exchange LinkedIns to see if its a match

Depends what the non-Ivy is. Depends on the office too, I'm sure. In either case, with some networking and an otherwise competitive application, it can definitely be done.