Is There Overlap Between Nasdaq and S&P?

This is one reason people like the S&P 500, as it represents a broader basket of stocks for the total market. The Nasdaq 100 has 79 stocks that overlap with the S&P 500! ... There are only 6 stocks that are a part of all three indices. In total, these three indices represent 521 unique stocks.

Do stocks increase when added to Nasdaq?

There is no change in the operating performance of firms of stocks that are added to the Nasdaq-100 Index.

Has the Nasdaq outperformed the S&P 500?

The Nasdaq-100 finished the first quarter of 2021 with a gain of 1.76% compared to the S&P 500 gain of 6.17%, an underperformance of 441 bps which - while notable - pales in comparison to 2020's incredible 3,000+ bps of outperformance.