As far as I remember, there were only approximately 7000 outstanding shares around the time GLBSE closed, although 25,000 shares had been issued (but not sold), and I believe the dividends were being split amongst the 7000 outstanding shares.
I'm a little confused as to how to calculate my own stake - if I have X shares, do I own 100% * X/7000 or 100% * X/25000?
Can someone explain: issued vs. outstanding, and what it means for the average nastymining fan?
Shares outstanding are shares sold on the open market (or otherwise in the hands of share holders).
Shares issued are the total number of shares the stock exchange granted to the asset manager.
Here is a scenario: If you manage an asset and plan to sell 1000 shares, but want the opportunity to sell more in the future, you setup your contract with 1000000 shares. And then only sell what you need. Then as the asset grows (more equipment, hash/s, etc.) you can sells more share with out having to re-structure the whole contract.
So to answer your question, you dividend should be based on the number of shares outstanding.