- According to Morningstar [data](https://www.morningstar.com/articles/1102347/the-index-inclusion-effect-isnt-cause-for-concern), inclusion into an index no longer attracts the usual rise (on announcement) and then fall in stock price.
- “_Indeed, the up-and-down trajectory that was once the fingerprint of the index inclusion effect now resembles a flat line that runs from announcement date through the weeks following inclusion in the S&P 500._“


![](https://cdn.commonstock.com/5119458c09f555296863844f334bd05586ce6f8748f188ac0f3d25b5638a0512-2024x1308.png)

its because the giants have become too big, time to kill some

Modern Growth Investing

The once-powerful benchmark bump has dissipated over time. 

https://www.morningstar.com/articles/1102347/the-index-inclusion-effect-isnt-cause-for-concern

The Index Inclusion Effect Isn't Cause for Concern

Index inclusion ain’t what it used to be

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