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Tuesday, September 30, 2025

Equity Trader Alert #2025 - 76
Nasdaq Reporting Updates for SEC Round Lot Changes

Category:

  • New Functionality

Markets Impacted:

Contact Information:

Resources:

As previously announced in ETA 2025-72, starting November 3rd 2025 the SEC will adopt new definitions for “Round Lot” information under the Market Data Infrastructure (MDI) Rules to enhance the transparency for investors and other market participants of quotes and orders in NMS stocks.

Nasdaq will introduce a new report called “Nasdaq-Listed Round Lot Updates” which will contain all active Nasdaq-listed symbols as of the last trade date in March and September and their respective round lot category for the first day of trading in May and November. This report will be posted on the NasdaqTrader.com Symbol Directory page twice per year, on April 1st and October 1st, and will not be updated between those dates.

The existing daily symbol files on NasdaqTrader.com will also receive the round lot updates starting the last day of trading in April and October.

For any questions, please contact Nasdaq Trading Services at +1 212 231 5180.

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