## B3 in 2024: Complete Guide on Trading Hours, Holiday Calendar, and Market Impacts

The Brazilian stock exchange continues its operations in 2024 with important adjustments to the calendar and trading hours. Understanding when the stock exchange opens and at what time is essential for investors in stocks and derivatives, especially considering the changes caused by the American daylight saving time and the national holiday calendar. Since its restructuring in 2017 with the merger between BM&FBOVESPA and CETIP, B3 has established itself as a trading center for more than 400 Brazilian companies, but its operation is not uniform throughout the year.

## When Does the Stock Exchange Open: Standard Hours and Special Periods

B3's operational calendar follows a well-defined pattern. From Monday to Friday, on business days, trading occurs between 10:00 and 17:00 Brasília time. However, this schedule varies throughout the year due to synchronization with international markets, particularly the American daylight saving time.

The trading session is divided into three distinct periods:

**Pre-opening:** Starts 15 minutes before the official trading session, between 9:45 and 10:00, when the exchange records orders issued after the previous close.

**Regular trading:** From 10:00 to 17:00, the main trading period where most transactions with higher liquidity take place.

**After market:** Between 17:30 and 18:00, when certain assets continue to be traded with specific limitations according to exchange rules.

## Time Change in March: Impact of the End of American Summer Time

A significant change marks 2024. Until March 10, during daylight saving time in the United States, B3 closes at 18:00. Starting March 11, 2024, the closing time returns to 17:00, with the after market resuming at the usual time of 17:30 to 18:00. This change reflects the direct influence that the American calendar exerts on Brazilian financial markets, mainly affecting the trading of international securities and commodities.

## Holiday Calendar That Halts the Stock Exchange in 2024

The regular operation of the stock exchange is interrupted on specific dates. B3 will be closed on the following national holidays:

- **January 1 (Monday):** New Year’s Day
- **February 12 and 13 (Monday and Tuesday):** Carnival, with a special note on Ash Wednesday (February 14), when there will be a continuous session from 13:00 to 17:55
- **March 29 (Friday):** Good Friday
- **May 1 (Wednesday):** Labor Day
- **May 30 (Thursday):** Corpus Christi
- **November 15 (Friday):** Proclamation of the Republic
- **December 25 (Wednesday):** Christmas
- **December 31 (Tuesday):** New Year’s Eve, with no operations due to internal banking procedures

Strictly local holidays, such as São Paulo’s anniversary, do not affect the stock exchange operations.

## Why Do Trading Hours Change: The Global Dynamics of Financial Markets

The interconnection between American exchanges and B3 is no coincidence. Investors in global funds, currency fluctuations, and price variations in commodities like oil and metals create a complex network of dependencies. Financial markets operate in synchronization, requiring B3 to adjust its hours to ensure active participation of Brazilian investors in international trades and to maintain external participants’ confidence in the domestic market.

For investors, the practical implication is simple: keeping track of the updated trading hours of the stock exchange is essential to avoid missing trading opportunities or letting deadlines expire. Any deviation in the calendar can mean the difference between executing a crucial operation or missing out on market movements.

Constantly monitoring B3’s official channels ensures that your strategies in stocks, derivatives, and other assets align with the institution’s operational reality.