Understanding ownership structure of a stock

[rayfinkle]

I'm wondering if anyone does analytics on the composition of ownership of a stock in detail. Specifically, by taking some inputs (13f/g's, daily weighted average volume, etc.) we can likely get a sense for what the weighted average entry price is for various owners of the stock. This can inform things like:

- is there likely to be tax loss selling?

- are folks "playing earnings" vs. more value oriented

 

Does anyone do this and find it useful? Are there data sources for it?

 

Thanks