SEC Tweaks Trading Lots: Because Round Numbers Matter in Wall Street
Published Date: 12/10/2025
Notice
Summary
NYSE Texas is updating its Rule 7.5 to match the new official definition of a 'round lot' from Regulation NMS, which took effect in November 2025. This change affects traders and brokers by clarifying what counts as a standard trading unit, helping keep things clear and consistent. The update is already in effect, so everyone can trade with confidence under the new rules right away.
Analyzed Economic Effects
1 provisions identified: 1 benefits, 0 costs, 0 mixed.
Round-Lot Rule Aligned With Reg NMS
On November 25, 2025, NYSE Texas amended Rule 7.5 so its definition of a “round lot” follows Regulation NMS. Under the Reg NMS definition (implemented the first business day of November 2025), a round lot is: 100 shares for stocks with an average closing price of $250.00 or less; 40 shares for $250.01–$1,000.00; 10 shares for $1,000.01–$10,000.00; and 1 share for $10,000.01 or more. This change clarifies for traders and brokers what counts as a standard trading unit.
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