Cboe EDGX Exchange is moving to revise its market data disclosure rule as the Texas Stock Exchange prepares to begin operating as a registered national securities exchange in mid-2026. The filing covers how EDGX publicly identifies data sources used in order handling, routing, execution, and related compliance functions.
Highlights
- Cboe EDGX Exchange filed a non-controversial rule amendment with the SEC on May 15, 2026, for immediate effectiveness.
- The amendment updates Rule 13.4(a) to cover public disclosure of data sources in anticipation of Texas Stock Exchange LLC operating between July 2 and July 17, 2026.
- The proposed change is operational, aligning EDGX's rulebook in advance for the expected inclusion of TXSE in the national market system framework.
Rule filing outlines disclosure changes
Securities and Exchange Commission documents show that Cboe EDGX Exchange filed the proposed rule change on May 15, 2026, and designated it as a non-controversial filing for immediate effectiveness under the Securities Exchange Act. The notice says the Commission is publishing the proposal to solicit comments from interested parties.The amendment updates Rule 13.4(a), which governs public disclosure of the sources of data the exchange uses across order handling, order routing, order execution, and related compliance processes. EDGX says the revision is intended to reflect the planned operation of Texas Stock Exchange LLC as a registered national securities exchange between July 2, 2026, and July 17, 2026.
Implications for exchange operations
The proposed change is operational rather than a broader shift in trading policy, aligning EDGX's rulebook with the expected addition of TXSE to the national market system framework. By updating the disclosure rule in advance of TXSE's planned start, the exchange is preparing its public data-source references for a larger competitive exchange landscape.EDGX says the proposal is consistent with Section 6(b) of the Act and advances the objectives of Section 6(b)(5), including the prevention of fraudulent and manipulative acts and practices, the promotion of just and equitable principles of trade, and the protection of investors and the public interest.
Our earlier coverage of the U.S. Postal Service’s proposed federal mail-ballot standards explained how the agency moved from voluntary guidance to mandatory requirements for general federal elections, including state-submitted voter lists and unique ballot barcodes. The report also noted that a federal judge declined to block the related executive-order provisions at an early stage, leaving the initiative to advance while signaling that further legal challenges could emerge as implementation proceeds.
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