What is Business Valuation and How do i value the business that i am holding? The fluctuation of my portfolio value from one month to the other has been forcing me to think hard and thoroughly about my valuation method in valuing businesses. Sunningdale's share price had reached its peak of about $2.40 per share a few months ago and has dropped down to $1.40 per share as per current price (my paper profit has also dropped down by $60k). AEM'share price had reached its peak of about $1.90 per share a few months ago and has dropped down to $0.83 per share as per current price (my paper profit has also dropped down by $50k). Have i been wrong in valuing the businesses i am holding so that i have missed out the opportunity to take profit earlier?  Have my portfolio management and allocation been wrong so that i have less cash ......