ESMA, the EU's financial markets regulator, is preparing to publish the updated standard market size (SMS) for Systematic Internalisers (SIs). This update is crucial for the new quoting obligations under the Markets in Financial Regulation Review (MIFIR). The upcoming publication aims to help market participants prepare for the new requirements, despite the official implementation date not being finalized. Revised Regulatory Technical Standard (RTS) 1 introduces lower and upper limits for SI quoting obligations. Several provisions within RTS 1 will apply twenty days after its publication in the Official Journal (OJ). These include the minimum quoting size and the transparency threshold for SIs, both of which depend on the recalibrated SMS. ESMA will publish the new SMS for liquid instruments the day before RTS 1 takes effect. The complete list of new SMS values will be accessible through the FITRS and the Register web interface. Give-up and give-in transactions will be excluded from post-trade transparency reporting off-venue. Additional provisions, including new pre-trade and amended post-trade transparency requirements, will be activated on March 2, 2026. These changes are designed to improve market efficiency.