# 2025-23818: Stock Exchange Tweaks 'Round Lot' Definition to Keep Up with Wall Street

2025-23818, Self-Regulatory Organizations; Long-Term Stock Exchange, Inc.; Notice of Filing and Immediate Effectiveness of Proposed Rule Change To Amend Exchange Rules 11.180 and Rule 14.002 To Conform With Recent Amendment to Definition of Round Lot Under Rule 600 of Regulation NMS, is a Federal Register notice from Securities and Exchange Commission published 2025-12-29, effective 2025-12-12 (as of 2026-06-08).

- Canonical: https://policyrisk.com/federal-register/2025-23818
- As of: 2026-06-08
- Plain-text twin of the page above; the HTML and this file carry the same facts.

## Facts
- Document number: 2025-23818
- Title: Self-Regulatory Organizations; Long-Term Stock Exchange, Inc.; Notice of Filing and Immediate Effectiveness of Proposed Rule Change To Amend Exchange Rules 11.180 and Rule 14.002 To Conform With Recent Amendment to Definition of Round Lot Under Rule 600 of Regulation NMS
- Type: Notice
- Agencies: Securities and Exchange Commission
- Citation: 90 FR 60844
- Published: 2025-12-29
- Effective: 2025-12-12
- Comments close: not stated
- Significant: no
- Touches household money: no
- Regulation identifier numbers: none
- Last updated: 2026-06-08

## In one line

Stock Exchange Tweaks 'Round Lot' Definition to Keep Up with Wall Street

## 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.

## Effects PRIA read

- Round Lot Definition Now Follows Rule 600: benefit, low. 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 sh…

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## Sources
- [2025-23818 on federalregister.gov](https://www.federalregister.gov/documents/2025/12/29/2025-23818/self-regulatory-organizations-long-term-stock-exchange-inc-notice-of-filing-and-immediate)
- [2025-23818 as published (PDF)](https://www.govinfo.gov/content/pkg/FR-2025-12-29/pdf/2025-23818.pdf)

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- [All Federal Register documents](https://policyrisk.com/federal-register)

Source: PRIA, https://policyrisk.com/federal-register/2025-23818 (as of 2026-06-08).