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Just three companies have topped the Fortune 500 since 1955

Preeti Varathan
Just three companies have topped the Fortune 500 since 1955

In 1998, IBM was the biggest American tech company by revenue. Now, some 20 years later, it’s not even among the top 30 companies in the Fortune 500. Today, Fortune released its annual Fortune 500, a list of the 500 largest American companies by sales. Together, the Fortune 500 firms represent more than $1 trillion…