S&P 500 Top-10 Concentration Hits 37%, Beating Dot-Com Peak
The S&P 500’s 10 largest stocks now command roughly 37% of the index — exceeding the 2000 dot-com peak. Here’s the data and what it means.
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S&P 500 Inclusion: What Really Happens When a Stock Joins
How a stock actually gets added to the S&P 500, what the historical “index effect” was, and why recent research finds that pop has largely vanished.
Russell 2026 Reconstitution: A $217B Day, Now Semi-Annual
FTSE Russell’s preliminary 2026 additions and deletions hit on May 22. The flip goes effective after the June 26 close – and now happens twice a year.
SanDisk Soars 12% on Nasdaq-100 Entry: The Index Effect Explained
SanDisk surged 11.83% on Nasdaq-100 inclusion news. Here’s the capital markets mechanics behind why index additions reliably move stock prices.