New York City is one of several large school districts around the country that are actively working to promote "computer science for all" students. Launched in 2015, NYC's CS4All initiative aims to ensure that all public school students learn computer science--especially female, Black, and Latinx students, who are starkly underrepresented in CS education and careers. The initiative is attempting to provide meaningful CS experiences that develop computational thinking, problem-solving, creativity, and critical thinking skills to every student, at least once in each grade band (K-2, 3-5, 6-8, 9-12). Part of the Research Alliance's ongoing evaluation of CS4All has been examining progress toward the initiative's goals, including the extent to which schools are reaching all of their students with CS (i.e., saturation), as well as the extent to which participation is equitable for girls and Black and Latinx students. The current analysis looks at the experiences of three cohorts of NYC students. [This report was written with Janice Lee, Alexandra Adair, Kathryn Hill, Edgar Rivera-Cash, and Symantha Clough. This work was supported by the CS4All Founders Committee.]