FINRA Tweaks Rules to Sync with SEC's New Round Lot Definition
Published Date: 12/23/2025
Notice
Summary
FINRA is updating several of its rules to match the new official definition of a “round lot” — basically, the standard number of shares in a stock trade. This change affects brokers and traders by making sure everyone’s on the same page with how trades are counted and reported. The update is effective immediately, so no delays or extra costs, just smoother trading!
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