I don't think the NYSE had any DEI requirements, but the NASDAQ created a rule where boards needed some minority representation in order to be listed. That rule was challenged and overturned in court though.

> On August 6, 2021, the SEC approved Nasdaq’s proposed diversity rule for companies listed on its exchange. The rule required Nasdaq-listed companies to (1) publicly disclose board-level demographic data annually and (2) have, or explain why they do not have, a certain number of diverse directors on their boards. Companies with more than five board members were required to have two members from an underrepresented group, including one female and one person who self-identifies as Black, Hispanic, Asian, Native American, Alaskan Native, Native Hawaiian, Pacific Islander, biracial, or LGBTQ+.

https://ogletree.com/insights-resources/blog-posts/fifth-cir...