Charter schools have become a significant part of the education sector in New York City since enabling legislation was passed in 1999. They now educate 123,000 students, or 10% of all public school students in the city, in 236 schools. The state law that allows the creation and funding of charter schools limits the number of charters that can be operated in the city and state. New York City is fast approaching the current cap, with only seven slots remaining for new charters. Unless the state legislature raises or eliminates the cap, the creation of new charter schools in the city will cease once the seven slots are filled. This paper offers a snapshot of past empirical research on New York City charter schools; it discusses results from the 2018 statewide tests in math and English language arts (ELA); and it explains why the success of charters has not come at the expense of traditional public ("district") schools.