The Vanderbilt waitlist data used to be available. This link to a 2016 The Washington Post article, “Top colleges put thousands in waitlist limbo and some wont accept any,” shows in 2014 Vanderbilt waitlisted 6,018 students, 4,536 students accepted a spot on the waitlist and 210 students were eventually accepted. Since the article ran, Vanderbilt has removed waitlist data from their Common Data Set for all prior years.