For the majority of the companies I mention I have developed an extensive Excel model which generally includes a discounted cashflow, which is the accepted preferred valuation technique used for appraising investments.
If I cover one of the investments you own and are interesting in acquiring my excel model please contact me. I do charge a small fee for providing a model but I hope this will be a small investment and enable you to better understand the equities you own. I am also open to covering new companies or other ad hoc financial modelling.
An example of my work in PDF form is here.