A single stock can have buyers, sellers, and prices being formed simultaneously on two different exchanges.

For many Brazilian investors, this idea still sounds unfamiliar. After more than two decades with stock trading concentrated on a single exchange, two distinct concepts have, in practice, come to seem like one and the same: the exchange where a company is listed and the environment where its shares are traded in the secondary market.

Listing establishes the relationship between the issuer and the entity responsible for monitoring the obligations associated with that status. Trading is a separate layer, where buyers and sellers submit orders and execute trades.

In a market with multiple exchanges, a company can remain listed on only one of them while having its shares admitted for trading simultaneously in another environment. What seems new in Brazil is an architecture that has been known for decades in markets like the United States and Europe.

CVM Resolution 135 already provides for this possibility and establishes coordination rules between the infrastructures that trade the same security.

The existence of different order books competing for trades on the same asset does not create new shares, does not represent a new issuance, and does not alter the rights of their holders.

In the model being built in Brazil, a trade executed on Base will be cleared and settled by the Base Clearinghouse, while a trade executed on B3 will follow B3's clearing and settlement infrastructure.

The paths may be different, but both converge to the same central depository, currently operated by B3. It is at this centralized deposit layer that the integrity of positions is preserved and transfers of ownership are reflected.

Exchanges also do not need to function as copies of one another. There are situations where coordination is mandatory, such as certain decisions to suspend or revoke trading authorization made by the entity responsible for the listing. In others, each market can establish its own rules, including trading hours, volatility control mechanisms, order types, and operational procedures, always within regulatory limits.

This is one of the central characteristics of a market with multiple exchanges, where the asset remains unique and what multiplies are the environments in which buyers and sellers can trade it.

With this plurality, a new market design emerges, involving the definition of best execution criteria, trading hours, the construction of price references, the coordination of supervision between different markets, and the development of technologies capable of locating liquidity across different exchanges.

These issues are gaining relevance as Brazil enters a new market configuration.