FINRA is not part of the government. They’re a not-for-profit organization authorized by Congress to protect America’s investors and is dedicated to investor protection and market integrity through effective and efficient regulation of broker-dealers. There are studies, news release, and statistics & data, etc.
Founding members of MEMX are Bank of America Merrill Lynch, Charles Schwab, Citadel Securities, E*TRADE, Fidelity Investments, Morgan Stanley, TD Ameritrade, UBS, and Virtu Financial. More content will be added as the organization develops, but in the short term it is a good source for updates.
Hosts various online and in-person exhibits from including: America In Circulation: A History of US Currency Featuring the Collection of Mark R. Shenkman; "Legal Tender," Featuring the Art of Emily Erb; Making Money Bank Note Engraving and the Fight Against Counterfeiting; High Notes.
Many items related to the Exchange published by the Exchange, are in the collection of the State Museum as part of the Historical Document Inventory. Archive Grid and the library's catalog are the best way to find them.
Includes a variety of digitized documents and other information related to Wall Street generally, but of note they have a digitized version of the the original Buttonwood Agreement, pieces about various NYSE rule changes, and published reports like Institutional Investor Holdings of NYSE-Listed Stocks from 1975 and Notes from SEC Meeting on Broker-Dealer Segregation from 1936. Also included are the National Association of securities Dealers (NASD) Annual Report, NASD Notice to Members, and NASD News.