B3 has changed the concentration limits for open positions for the lending, forward and options markets. These limits are calculated based on the free float of shares and will now be 10% for each investor or group of investors, considering each market separately. Furthermore, groups of instruments will be created to aggregate positions from these markets, with a 15% limit applied to the free float. This means that if an investor uses 10% of their portfolio in one of the markets, only 5% will be available for allocation to another market within the group. The change aims to offer greater flexibility to participants, allowing for a better distribution of limits according to their investment strategies.

To render contract management more efficient, B3 implemented the functionality rejection per lot on its post-trade platform, RTC (Real Time Clearing). Currently, participants need to reject each amendment, renewal or early settlement individually. With this improvement, clients can reject all available transactions at once, providing greater agility and convenience to the process.

B3 has implemented an improvement to the margin call process in asset lending transactions. Now, when the borrower returns an asset to the lender, there will no longer be a margin call between the 11:00 AM and 4:00 PM windows. This is because the asset is being returned to the portfolio of the lender who is the asset's owner. This eliminates the need to use liquidity resources during this time interval.

Starting October 1, 2025, B3 will publish securities lending renewal rates directly on its website through the Daily Market Bulletin (BDM). The data will be available in the Clearinghouse chapter on the "Asset Lending - Renewals" table.

B3 is continually improving the operational flow of broker dealer accounts to offer greater efficiency and reliability to its clients. In 2024, it delivered some significant improvements, and will continue to advance with new implementations throughout 2025. These developments include greater automation of processes, increased operational capacity and solutions to optimize problem-solving in group dismantling, ensuring an increasingly seamless and secure experience.

B3 has improved the filter functionality in the Subscription and Priority Offer modules of its post-trade platform – RTC (Real Time Clearing) – to facilitate the return of subscription rights by position or instrument. Previously, this process had to be carried out contract by contract, which required more time and operational effort. With the new solution, participants will be able to fill in the total quantity available for return in lots. Furthermore, the quantity field will remain editable, allowing clients to opt for a partial return, according to their needs.

Insertion of Delta and MTM data for Centrally-Cleared Options in the G015 file. The goal is to share these parameters with clients so that they can use them to replicate internally in pricing engines, among other purposes.