[TheBramble]

Most indices use 'Available Float' in their weighting calculations, especially within the S&P family of indices.

Available Float is generally considered to be that amount of stock which is available to 'the public'. Stock held by government agencies, public companies and control groups is NOT included within the 'available float' data.

I'd appreciate it if anyone could point me to where or how I could determine for any specific stock, how much the 'Available Float' represents at any given time as a percentage (or any other measure) of the total market capitalisation for that stock.

Apart form considering this a potentially useful piece of data in the area of Momentum (volume / float) analysis, it strikes me that in times of deep woe, the Available Float could potentially substantially increase - up to total market cap value in theory.