Ann: EN1 Welcomes Industry Leading Ad Serving Platform, Smart, page-15

All good even if you wanted to reinvest the original $800 that would pretty much give you roughly the same holding of 160,000 shares (obviously brokerage isn't included).

However yes you are also free to just sell out completely and take the tax loss plus the remaining capital towards another stock.

Again none of this is financial advice and is purely just my understanding, so please seek professional advice before making any decisions...