“In the boom years of the 1950s, the 10 biggest companies, including AT&T, DuPont, and General Motors, regularly exceeded 30% of the value of all U.S. stocks. In July 1955, GM alone—up 78% over the previous 12 months—amounted to 6.8% of the value of the entire U.S. stock market, according to the Center for Research in Security Prices.”
Read the full article at the Wall Street Journal.
Using CRSP Market Indexes Methodology, CRSP Count™ tracks changes in the number of securities by market cap segments – Mega, Mid, Small and Micro – through time.
CRSP US Total Market Index includes most of the new IPOs within five trading days of listing. This new report looks at the trends in IPOs and their impact on CRSP Market Indexes.
“Antti Petajisto contributed to the literature on the risks of concentrated positions with his June 2023 study, “Underperformance of Concentrated Stock Positions.” His data sample was from CRSP and covered
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