NYSE American Joins Round Lot Rule Refresh Parade
Published Date: 12/10/2025
Notice
Summary
NYSE American just updated its rule to match the new official definition of a 'round lot'—which is basically a standard group of shares you trade. This change affects traders and brokers using the Exchange and took effect right away in December 2025. No extra costs, just smoother, clearer trading rules that keep everyone on the same page!
Analyzed Economic Effects
2 provisions identified: 2 benefits, 0 costs, 0 mixed.
Round-Lot Size Now Price-Based
NYSE American changed Rule 7.5E so a “round lot” follows the Regulation NMS definition that sets round-lot sizes by a stock’s average closing price: $250.00 or less = 100 shares; $250.01–$1,000.00 = 40 shares; $1,000.01–$10,000.00 = 10 shares; $10,000.01 or more = 1 share. The rule replaces the prior wording “specified by the primary listing market” with “required by the definition of ‘round lot’ under Regulation NMS.”
Rule Change Effective Immediately
The Exchange filed the amendment on November 25, 2025 and the filing became effective under Section 19(b)(3)(A) and Rule 19b-4(f)(6), meaning the Exchange’s Rule 7.5E now reflects the Regulation NMS round-lot definition without a delayed effectiveness period. Regulation NMS’s round-lot definition itself was implemented on the first business day of November 2025.
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