The page which shows the stocks in the portfolio could have been in a single table.
Additional navigation page for adding a stock can be avoided.
Same stock if added twice should be collated into a single row.
A page about the objective of the site and options available will be good


Additional Features:
1. Pie charts for overall stock assets in portfolio
2. Ability to see trend charts since for a stock since it was added to the portfolio.
3. Per stock see which high level segment ( petroleum, IT, consumer goods etc) it belongs to and see the asset allocation % per such segment.