https://www.finra.org/rules-guidance/guidance/national-market-system-plans
National Market System Plans | FINRA.org
Below are links to the central web sites that provide copies of each of the three NMS Plans in which FINRA participates.
national market systemplansfinra
https://sechistorical.org/digital-archive/commission-to-consider-direct-participation-interests-and-increase-in-national-market-system-securities/
Commission to Consider Direct Participation Interests and Increase in National Market System...
national market systemparticipation interestscommissionconsiderdirect