"For example, while NASDAQ requires boards to be comprised of a majority of independent directors, who are required to hold executive sessions apart from non-independent directors, it does not prescribe a minimum number of board members or a fixed number of executive sessions. "

https://listingcenter.nasdaq.com/assets/NLHRC...T_0610.pdf

The company’s board of directors is required to have a majority of
independent directors.

https://listingcenter.nasdaq.com/assets/initialguide.pdf