Standard & Poor’s has announced details of the upcoming free float adjustments for the S&P 500, S&P MidCap 400, S&P SmallCap 600, S&P Composite 1500, S&P 100 and their related sub-indices.
Beginning March 18, 2005 official S&P U.S. indices will shift to a half float-adjusted calculation. Each company will be adjusted by half of its intended float factor.
On September 16, 2005 all official S&P U.S. indices will shift to a full float-adjusted calculation.
Attention Index Alert and Plus File Clients:
As part of the transition to float adjustment, on March 18, 2005 new file formats were introduced. The files for the official Standard & Poor's US Indices (S&P 500, S&P MidCap 400, S&P SmallCap 600, S&P REIT and associated derivative indices) now use the following naming convention: YYYYMMDD_SPindexname and are available on both the Index Alert Market Insight and FTP platforms The non-float adjusted "classic" versions of the indices will continue to be available using the old file names until September 16, 2005.
