## What Time Does the B3 Stock Exchange Open in 2024? Everything You Need to Know

B3, Brazil's largest stock exchange, maintains a specific schedule in 2024 that every trader should know. If you're wondering what time the stock exchange opens, the answer involves not only the official opening hours but also the pre-opening and after-market periods, as well as the days when the exchange is closed.

## Operating Hours: The Complete Structure

Since 2022, the Brazilian market has followed a stable pattern. On business days, B3 operates between 10:00 and 17:00 (Brasilia time). However, this structure is complemented by two additional periods that expand trading opportunities.

**Pre-opening** occurs 15 minutes before the regular trading session begins. Between 9:45 and 10:00, the system records accumulated orders from the previous close. This period allows traders to position their strategies before the official opening.

After the regular hours, the **after-market** operates, where certain assets are traded between 17:30 and 18:00. It is important to note that this period varies according to the US daylight saving time and has specific trading limitations.

## The March 2024 Change

Until March 10, 2024, B3's closing was scheduled for 18:00, a measure directly linked to US daylight saving time. Starting March 11, the operating hours return to the standard structure, with closing at 17:00 and the after-market resuming from 17:30 to 18:00.

This fluctuation occurs annually and reflects the integration of the Brazilian market with international capital flows. The change is due to the end of daylight saving time in the US, which concludes on March 10.

## Holiday Calendar Affecting the Stock Exchange

The 2024 calendar reserves specific periods when the exchange does not operate. Check out the national holidays that impact trading:

**January:** 01 - New Year’s Day

**February:** 12 and 13 - Carnival (with continuous session on the 14th from 13:00 to 17:55)

**March:** 29 - Good Friday

**May:** 01 - Labor Day | 30 - Corpus Christi

**November:** 15 - Proclamation of the Republic

**December:** 25 - Christmas | 31 - New Year’s Eve (internal banking hours)

Local holidays, such as São Paulo’s anniversary, do not interrupt stock exchange operations.

## Why Do These Adjustments Matter?

The synchronization between the Brazilian stock exchange and international markets is no coincidence. Global investment funds, exchange rate fluctuations, and commodity prices such as oil and metals are directly influenced by simultaneous operations in both hemispheres.

Keeping the stock exchange active during the same periods as global markets ensures that Brazilian traders do not miss significant opportunities and that international capital flows continue confidently into the local market.

Therefore, knowing what time the stock exchange opens, as well as its closing periods, is essential for any market participant aiming to optimize their operations in 2024.