[1] After the acquisition, it operated as an independent investment bank known as CS First Boston until 2006, when the company was fully integrated into Credit Suisse.

By 1947, the First Boston surpassed $1 billion in new capital issues, and in 1959 it reintroduced the credit of Japan to the American markets with the first offerings by its government since 1930.

As of 1970, First Boston was considered to be part of the bulge bracket along with Morgan Stanley, Dillon Read and Kuhn Loeb.

In 1971, The First Boston Corporation listed on the New York Stock Exchange developed its equity, sales, research, and trading operations.

First Boston sat at the top of merger and acquisition league tables in the 1980s, thanks to the team led by Bruce Wasserstein and Joseph Perella, which orchestrated such transactions as the leveraged buyout of Federated Stores, which earned First Boston $200 million in fees,[10][11] and Texaco's hostile takeover of Getty Oil.

[13] By 1987, M&A advisory work contributed half of First Boston's profit and Wasserstein asked the management committee to divert resources to his unit from bond trading.

"[15] During this period, problems occurred within CS First Boston as teams in New York and London were managed separately and in some cases had competing salespeople covering each other's territory.

A Nevada judge issued a cease and desist order to stop Barclays from taking American owned assets and offering them to international buyers from Iran, Iraq, Syria, Egypt, and North Korea.