Coindesk is reporting a first-of-a-kind Ethereum transaction on blockchain. https://www.coindesk.com/security-settles-ethereum-first-kind-blockchain-transaction/ I think it was a necessary experiment, even though it is really clear that a security will settle first using blockchain technology in the after market. Additionally, the test was run over a decentralized blockchain, but the whole set-up of the different parts of the system made it very centralized and excludes third parties entering the system. But all in all it was a experiment well done, showing the future potential of blockchain technology. It illustrates the vision of ChainBLX to scale such transactions to create a completely decentralized economy, which will include trading of digitalized stocks, fiat currencies, cryptocurrencies, options directly with each other, without the additional step of going through the traditional banking system.
This is the non-us version of tzero see www.tzero.com but as tzero is regulated there's a lot less they can talk about, but they've been doing crypto securities for years, and even crypto lending (although with only limited amount of companies) but it's all set to go off soon. see this SA article: https://seekingalpha.com/article/4140678-tzero-ico-make-overstock-wall-street-favorite