Question Summary:
My understanding of fatwa 15981 is that it is not permissible to buy shares or invest in the stock market.

Question Detail:

Assalamualiakum,
My understanding of fatwa 15981 is that it is not permissible to buy shares or invest in the stock market.
However, this fatwa says that it is permissible if certain conditions are met.
With regards to Fatwa #  6755, I would like to confirm that trading in shares in stock market is not permissible even if the conditions in this fatwa are met. This fatwa is also available on many websites on the internet.
Jazakalla

Answer :

In the name of Allah, Most Gracious, Most Merciful
Assalaamu `alaykum waRahmatullahi Wabarakatoh
Yes your understanding is correct. 
And Allah knows best
Wassalam
Mufti Ebrahim Desai
Darul Iftaa, Madrassah In'aamiyyah