Money Stock market, most banks closed for Martin Luther King Jr. Day, while stores, restaurants and parks open January 18, 2021January 18, 2021 Kelly Tyko, USA TODAY Comments Off on Stock market, most banks closed for Martin Luther King Jr. Day, while stores, restaurants and parks open U.S. stock markets and most banks will be closed Monday in observance of Martin Luther King Jr. Day. But most stores and restaurants are open.