Are US stocks really up this year?

Just a few stocks tend to drive the entire market, according to an ASU researcher.

In this story published April 10, 2023, on Yahoo Finance:

It turns out that the best-performing 4% of listed companies explain virtually the entire net gain for the U.S. stock market since 1926. This is according to research by Hendrik Bessembinder, a professor at Arizona State University's W. P. Carey School of Business. The other 96% earn, on average, the rate of a one-month Treasury bill.

– Hendrick Bessembinder, professor and Francis J. and Mary B. Labriola Chair in Competitive Business