The exchanges currently sell this market information, typically to big, institutional investors.
The Trump administration is debating whether to push the New York Stock Exchange to delist tech giants Alibaba and Tencent.
Bellwether market index also adds Honeywell and Amgen and expels Exxon and others. Move reflects tech's expanding role in the economy.
Who actually benefits when Wall Street hits a record?
About 25% of brokers are back.
Marketplace host Kai Ryssdal spoke with NYSE President Stacey Cunningham ahead of traders returning to the floor.
NYSE says it has run tests and is fully capable of operating electronically.
The opening and closing bells at the New York Stock Exchange are daily ceremonies with a wide-ranging cast of attendees.
In the world of high-speed trading, a lot can happen in .000002 seconds.