Silicon Valley-based Long Term Stock Exchange (LTSE) goes live on Aug. 28, starting with two stocks and then ramping up to include all securities by Sept. 9. The Members Exchange (MEMX), which is backed by a who's who of Wall Street firms, begins a phased launch on Sept. 4, and MIAX Pearl Equities debuts on Sept. 25.

That will bring the total to 16 stock exchanges, with NYSE-owner Intercontinental Exchange Inc operating five, Cboe Global Markets running four, Nasdaq with three, and IEX Group one.

The new bourses enter the market amid frothy trading volumes and a recent record high by the S&P 500 following a months-long rally in stocks after governments pumped trillions into the economy to counter the coronavirus' economic impact.

The new competition also comes at a time of intense debate over fees between the large exchange operators and their customers.

MEMX will address those issues, Chief Executive Jonathan Kellner said in an interview.

"On transaction fees, out of the gate, we are looking to be aggressive to attract order flow," he said.

MEMX's investors include big banks, like JPMorgan, Bank of America, Goldman Sachs, as well as BlackRock Inc, the world's biggest money manager. Online brokers including Charles Schwab Corp, Fidelity, and TD Ameritrade, and market makers Citadel Securities and Virtu Financial are also backers.

MIAX, which runs three options exchanges, has said it intends to start out 40% cheaper than the current lowest-cost operator.

The LTSE said it aims to promote longer-term thinking by the companies it lists through stricter corporate and stakeholder policies.

By John McCrank