## B3 2024: Complete Guide on Operating Hours and When the Stock Exchange Closes

For those active in the Brazilian financial market, knowing the B3 operating calendar in 2024 is essential to avoid missing trading opportunities. The Brazilian stock exchange operates with specific hours that change throughout the year, mainly due to the influence of American daylight saving time. Find out when the exchange operates and what time it closes to better plan your transactions.

## How B3 operates during the week

The Brazil Stock Exchange operates from Monday to Friday during business hours. Since its restructuring in 2017, resulting from the merger between São Paulo Stock, Commodities, and Futures Exchange (BM&FBOVESPA) and the Central Securities Depository and Clearinghouse (CETIP), B3 allows trading of securities and shares from over 400 Brazilian companies.

The operational pattern has remained since 2022. On regular business days, trading occurs between 10 a.m. and 5 p.m. (Brasília time). However, this structure is accompanied by three main periods:

**Pre-opening:** Starts 15 minutes before the official trading session (9:45 a.m. to 10 a.m.), allowing order registration issued after the previous close.

**Main session:** From 10 a.m. to 5 p.m., when the main trading activities take place.

**After market:** Operates from 5:30 p.m. to 6 p.m., enabling transactions of certain assets even after the regular trading session, subject to specific operational rules.

## Time change in March: when does the stock exchange close

Until March 10, 2024, B3 closes its activities at 6 p.m. This extension occurs under the influence of American daylight saving time, which directly impacts the trading of certain Brazilian securities.

Starting March 11, 2024, closing returns to 5 p.m., with the after market resuming from 5:30 p.m. to 6 p.m. This change coincides with the end of U.S. daylight saving time on March 10, requiring investors to be especially vigilant to adjust their strategies.

## Holidays that impact the exchange calendar in 2024

B3 will be closed on specific national holidays. Municipal or state holidays, such as São Paulo City Day, do not affect operations:

| Month | Date | Holiday |
|-------|-------|---------|
| January | 01 (Monday) | New Year’s Day |
| February | 12 and 13 (Monday and Tuesday) | Carnival* |
| March | 29 (Friday) | Good Friday |
| May | 01 (Wednesday) / 30 (Thursday) | Labor Day / Corpus Christi |
| November | 15 (Friday) | Proclamation of the Republic |
| December | 25 (Wednesday) / 31 (Tuesday) | Christmas / New Year’s Eve** |

*On Ash Wednesday (February 14), there will be a continuous session from 1 p.m. to 5:55 p.m., with pre-opening from 12:45 p.m. to 1 p.m. Derivatives and commodities open at 1 p.m. (pre-opening 12:55 p.m. to 1 p.m.). Over-the-counter market operates from 1 p.m. to 5:55 p.m.

**On December 31, B3 does not operate due to internal procedures at banking institutions.

## Why do hours change and what impact does this have

Synchronization between the Brazilian and American exchanges is essential for the efficient functioning of the global market. International fund investors, exchange rate fluctuations, and commodity price changes (oil, metals) create an interdependence that requires constant adjustment of schedules.

International holidays alone do not alter B3’s operation. However, the period of U.S. daylight saving time generates significant impacts. Investors need to stay vigilant to avoid missing operational deadlines and to maintain active market participation, ensuring trades are executed safely and within permitted periods.

Regularly check B3’s official channels to confirm any changes to the calendar and ensure your investments are executed at the right time.