Brown posted the Admissions rate for the Class of 2024 on the Undergraduate Admissions website: https://admission.brown.edu/explore/admission-facts
"36,793 applications to the Class of 2024 (2nd largest applicant pool ever,) and a 7.7% acceptance rate for the Class of 2024."
This means that 2,833 students were admitted this year, an increase of 94 students from the Class of 2023; which had 2,739 acceptances out of 38,674 total applications (largest applicant pool ever,) for a 7.1% acceptance rate.
Class of 2023 Profile: https://admission.brown.edu/sites/g/files/dprerj526/files/2019-11/Counselor Newsletter.pdf
However, the march Brown Admissions news article (https://www.brown.edu/news/2020-03-26/admitted)
states that 2,533 students were admitted Early Decision and Regular Decision. This, and the revised number, leaves a deficit of 300 students admitted off the wait-list.
The march Admissions article from the Brown Daily Herald (https://www.browndailyherald.com/2020/03/26/brown-admits-6-9-percent-applicants-amid-covid-19-crisis/)
states that ~800 students are on the wait-list, with "anywhere between two to 300 students [admitted] off the wait-list." With the 300 students admitted from the wait-list this year, that's a 37.5% acceptance rate; however, it's surprisingly not unusual for the Admissions Office.
My Thoughts: By admitting 1000 more students during both the Early and Regular Decision rounds, Brown Admissions was able to mitigate the impact of a potential increase in deferral requests. There was likely also a higher actual yield rate than the Admissions Office had predicted for this year, coupled with a lower number of deferral requests: likely because of Brown's strong financial aid policies (& the Brown Promise) given that 70% of admitted students intended to apply for financial aid (this number is definitely lower than the actual percentage of recipients, but still represents an increase.) At Brown at least, there likely won't be as huge of an impact on the potential available seats for the Class of 2025, though applying ED is playing an increasing role in enrollment management: ED admits by percentage of the class increased to 48% from 46% last year with ~30 additional admits (this is assuming that every student admitted ED committed, though the actuality is that a few will withdraw from the ED commitment due to finances.)
Also, I found it interesting that Brown ended up not pulling as many students from the wait-list as previously predicted at most similar schools. This is more informative than a discussion, but feel free to comment down below any thoughts about the admissions cycle this year.
Class of 2024 ED Profile: https://www.brown.edu/news/2019-12-12/early
Class of 2023 ED Profile: https://www.brown.edu/news/2018-12-13/admit