Investors may not be appropriately protected when they trade using new technologies.
Customers allegedly received misleading information, affected by outages and inappropriately approved to trade.
A significant portion of trading volume at open is from retail investors.
Gary Gensler, SEC chairman, highlighted payment for order flow in a Congressional hearing.
Total average daily volume last year was just below the record in 2018.
The regulator said it is monitoring the ongoing market volatility in options and equities markets.
Data shows AAPL and TSLA stock splits improved most of their tradability metrics.
The influx of 'Main Street' market participants is a welcome development, but educational guardrails are needed.
Retail traders can make the equity markets more vibrant and liquid -- as long as they avoid common pitfalls.