The New York Stock Exchange celebrated a milestone Wednesday.

The Big Board is officially 225 years old.

Back in 1792, 24 stockbrokers created the exchange when they signed an agreement to trade with each other.

As of now, stocks are traded for more than 24-hundred companies.

To mark the occasion, several exectives from listed companies like Morgan Stanley and Shake Shack rang the opening bell.

It's a tradition that dates back to the 1870s, when a Chinese gong was used.

That was replaced by the brass-style bell when traders moved into the current building at 11 Wall Street in 1903.

The New York Stock Exchange is the only major equities trading floor left in the world.