Are newer firms displacing the largest 20th-century incumbents?
Core argument: Companies founded after the end of World War II accounted for 77% of the top 50 U.S. market cap in 2024, up from 8% in 1990.
Value creation among American big businesses became strikingly concentrated in the 21st century, and largely left out the giants of the 20th. In 1990 companies founded after the end of WWII were responsible for only 8% of total top 50 market cap. In 2024, the equivalent figure was 77%. The incumbents of the 20th are fading and an entirely new cohort, the most prominent members of which are not yet 50, is taking over.

