The Place for Comprehensive Index Rebalance Information
Reconstitution calendars, methodology rules, and passive-flow context for the indexes that move trillions — S&P, Nasdaq, Russell, MSCI, and the broader global universe.
#What are you looking for:
Country specific
Japan, Australia, UK, Germany, India, Brazil and more — regional index families and their rebalance clocks.
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Event specific
Deep-dives on individual reconstitutions, inclusions, and methodology changes.
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Index specific
Rules, dates, and tracking assets for each major index family.
AVAILABLE
Recent filings of note
Index-relevant filings, announcements, and consultations worth reading.
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#Index families
All — constituent matrix
1,500+ tickers with estimated weights across the top indexes, side by side. Search any name.
AVAILABLE
S&P 500 · 400 · 600
Search constituents — % of index, dollars and shares per $100M tracking. ~$20T benchmarked.
NEXT: SEP 18, 2026
Nasdaq-100
Constituent finder plus the overhauled May 2026 rulebook — Fast Entry, quarterly rank reviews.
NEXT: DEC 21, 2026
Russell US
Now semi-annual: the first-ever December reconstitution lands this year. ~$12.2T benchmarked.
NEXT: DEC 11, 2026
#Why now
$553.9B
traded at the close of the June 2026 Russell reconstitution — an all-time record
Dec 11
first-ever December Russell reconstitution, new for 2026
96.8%
of US ETF assets sit in funds above $700M AUM
~$16B/yr
estimated investor cost of predictable rebalancing (NBER w33554)
2026 is the biggest year of index-methodology change in a decade: Russell went semi-annual, the Nasdaq-100 rewrote its rulebook, Morningstar acquired CRSP, and Bloomberg locked down fixed-income month-ends. See everything that’s coming →