S&P DJI freezes S&P 500 rules, adds 0.10 IWF floor to broad market indices

SPGI

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2026-06-04

S&P DJI retained all eligibility criteria for the S&P 500, MidCap 400 and SmallCap 600, preserving existing financial viability, seasoning and 0.10 IWF requirements. New additions to S&P Total Market and Dow Jones US Total Market indices require 0.10 IWF or float-adjusted cap ≥10% of the 100th largest constituent.

1. Consultation and Decision Process

S&P Dow Jones Indices launched a public consultation on MegaCap treatment proposals to gather market feedback on potential methodology changes for its US indices. The Index Committee reviewed all submissions and concluded that maintaining existing rules best preserves index independence, transparency and investability.

2. No Changes for S&P 500, MidCap and SmallCap

After evaluating responses, the committee decided there will be no adjustments to financial viability screens, 12-month IPO seasoning periods or the 0.10 investable weight factor for the S&P 500, S&P MidCap 400 and S&P SmallCap 600. All current eligibility requirements remain unchanged.

3. New Requirements for Broad Market Indices

For the S&P Total Market and Dow Jones US Total Market indices, any new constituent must meet a minimum IWF of 0.10 or have a float-adjusted market capitalization representing at least 10% of the 100th largest constituent. These criteria aim to balance broad market coverage with investability standards.