Another possible screen

In a post that I cannot find, somebody mentioned that only a handful of stocks accounted for the majority of the market returns.

Just today I ran across a youtube video where he said:
"Something like 10% of all stocks accounted for like 90% of returns going back like 100 years or something like that so if you didn't have those 10% you would have been better in treasury bills."

The One and Only Reason You Need to Own The SP 500 Index
YouTube: The One and Only Reason You Need to Own The SP 500 Index (Heritage Wealth Planning)

His argument was that the S&P500 is an active index that goes for stocks that are expected to have good returns, and therefore you don't need to pick your own individual stocks as they have already been picked for you.

"A committee from S&P Dow Jones Indices chooses the companies that make up the S&P 500 index. The committee considers a company's financial health and other factors to determine if it's eligible for inclusion."

He showed that the stocks in the top 20 changed from year to year.

My thought was what if you ran a screen where you held just the top 10 or 20 S&P 500 stocks and held for a year, then repeated each year.
As an added bonus, this screen does not depend on Value Line to get their act together. </snark>

A preliminary look indicates that this would have beaten the S&P 500 by 3%-5% over the last 35 years.