The initial interview was on their montage system where you have to record two responses to prerecorded questions. Those questions were straightforward (Why BlackRock? Talk about a time where you were innovative). The next round of interviews was a skype interview with an employee. It was roughly a 30 minute interview. The questions were mainly behavioral (resume based and personality based) although I was asked to pitch two stocks as well (nothing serious, just two companies and why I liked them). A word of advice, it is always a good idea to have questions ready to ask your interviewer! After a few days I found out I was selected to attend their superday in Princeton. The superday was 4, 30 minute consecutive interviews with different directors and portfolio managers. Again mainly behavioral questions and questions based off of your resume. Be ready to talk about things off of your resume as well. This key to remember in this part of the process is that they want to see that you are sociable, well rounded and someone who they'll want to work with everyday. All around, a fantastic experience and HR ran a very smooth interview process.