If anyone has 2018 admission stats information (preferably quoting an authoritative online source such as a school press release, school newspaper article, etc.) please consider sharing it in this thread.
Andover: 13% acceptance rate, 80% yield, 3140 applicants (source: Phillips Academy website, April 19, 2018 )
Choate: 15% acceptance rate (source: Choate Admissions Dept, April 2018)
Exeter: 16% acceptance rate, 80% yield, 320 commits (source: The Exonian, April 19, 2018)).
Andover: 13% acceptance rate, 80% yield, 3140 applicants (source: Phillips Academy website, April 19, 2018 )
Choate: 15% acceptance rate (source: Choate Admissions Dept, April 2018)
Exeter: 16% acceptance rate, 80% yield, 320 commits (source: The Exonian, April 19, 2018)
Thacher: 12% admitted; 79% yield; 44% identify as people of color. Source: Message to incoming students.
UPDATE:
Andover: 13% acceptance rate, 80% yield, 3140 applicants (source: Phillips Academy website, April 19, 2018 )
Choate: 16% acceptance rate, 65% yield, approx. 2500 applicants, approx. 260 spots (source: Choate Admissions Pamphlet, September 2018)
Exeter: 16.6% acceptance rate, 79% yield, 2686 applicants, 353 spots (source: PEA website, Sept, 2018)).
Thacher: 12% admitted; 79% yield; 44% identify as people of color. Source: Message to incoming students.