One more interesting idea - Apple, Google, Facebook, Amazon, Tesla Stocks to be Tokenized on Ethereums Blockchain 
https://www.trustnodes.com/2019/01/04/apple-google-facebook-amazon-tesla-stocks-to-be-tokenized-on-ethereums-blockchain
This is just great news! If this happens, there will be a huge explosion. Waiting, gentlemen.https://www.trustnodes.com/2019/01/04/apple-google-facebook-amazon-tesla-stocks-to-be-tokenized-on-ethereums-blockchain
I wouldn't focus too much on that DX Exchange.
For one, its not being launched by NASDAQ, it just uses the NASDAQ trading engine. They are just mentioning it for marketing purposes.
Also will the exchange do KYC? If not then I would becareful because I don't think the SEC will allow trading of US securities on the DX exchange. Even if they do KYC, I still don't understand what loop-hole they went through to be able to allow trading of US stocks. This is very similar to CFDs and other derivatives. Maybe if it doesn't allow US customers it might be acceptable I guess.