Event Dime

The Impact Round Lot Reform Had on U.S. Equities Market Quality

Events
When:
April 28, 2026 ยท 4:00 AM
Where:
Cboe Global Markets
Source:
Cboe Global Markets

As of November 3, 2025, the Securities and Exchange Commission (SEC) adopted amendments to certain rules of Regulation National Market System (Regulation NMS), one of which was introducing a new price-tiered round lot framework for NMS stocks. Under the new framework, round lot sizes are scaled to share price: 100 shares for stocks priced at or below $250, 40 shares for stocks priced between $250 and $1,000, 10 shares for stocks between $1,000 and $10,000 and one share for stocks priced above $1

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