Stock Exchange Tweaks 'Round Lot' Definition to Keep Up with Wall Street
Published Date: 12/29/2025
Notice
Summary
The Long-Term Stock Exchange (LTSE) is updating two of its rules to match a new official definition of a 'round lot'—basically, the standard number of shares in a stock trade. This change affects traders and brokers using LTSE and takes effect immediately, with no extra costs involved. It keeps LTSE in sync with the latest market rules and helps everyone trade smoothly.
Analyzed Economic Effects
1 provisions identified: 1 benefits, 0 costs, 0 mixed.
Round Lot Definition Now Follows Rule 600
If you trade or broker stocks on the Long-Term Stock Exchange (LTSE), the exchange now uses the Round Lot sizes assigned under Rule 600 of Regulation NMS instead of a default 100-share lot. Rule 600 assigns round lots by average closing price: $250.00 or less = 100 shares; $250.01–$1,000.00 = 40 shares; $1,000.01–$10,000.00 = 10 shares; and $10,000.01 or more = 1 share. Adjustments occur semiannually based on a one-month Evaluation Period (March for May assignments; September for November assignments). The LTSE change is effective December 12, 2025.
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