You can sell SRSR up to the last minute on December 31st to declare a tax loss. It has nothing to do with clearing of funds.
Be aware that you either have to wait till the 31st day to re-buy the same stock you took the loss on or it will become a wash sale. However, if you don't want to take the chance the stock will run before the 31st day you can buy and equal amount or more shares in the same stock before you sell. That way you get the benefit of the tax loss write off and still hold stock in that company.
This is only my opinion. You should research before you invest to limit your risk. When you invest in pinks its all risk and most fail, Never risk more the 10% of your holdings in pink sheet stocks!
Howard Haftel