The Russell US Indexes are designed to reflect the ever-changing US equity market, and the annual reconstitution process is critical to maintaining accurate representation.
During this highly-anticipated market event, the breakpoints between large, mid and small cap are redefined to ensure market changes that have occurred in the preceding year are captured. Companies are also revaluated to determine where they lie along the investment styles spectrum.
2019 Reconstitution calendar for Russell US Indexes
May is "ranking" month when the largest US companies are lined up to form the preliminary Russell US reconstitution portfolio. In 2019, the rank day falls on Friday, May 10.
June is the month that the preliminary reconstitution portfolio is communicated to the marketplace. Beginning on June 7, preliminary lists are communicated to the marketplace and updates are provided on June 14, 21, and 28. The newly reconstituted indexes take effect after the market close on June 28.