Andra Capital
Tezos industrial grade smart contracts and long term governance model seems to be enticing enough for STO platforms to make the switch from Ethereum to Tezos. Last week Andra Capital announced to launch their $500 million worth of STO’s on Tezos, while in 2018 they initially announced to use Ethereum as platform of choice.
Andra Capital’s announcement on Ethereum in 2018. Source.

Transfer Agent Vertalo
Today, Transfer Agent Vertalo announced that they made Tezos their default blockchain for STO issuance. “The company has chosen Tezos because its smart contract abilities are available in multiple programming languages, Hendricks said. He also cited Tezos’ rate of transactions per second, stable network of participants and the collateralization opportunities offered by being a proof-of-stake network.”
The NYX standard on Tezos
With the upcoming launch of the NYX standard on Tezos, we can only expect more issuance platforms and companies to have a preference for Tezos. Not only will the NYX standard have more extended functionality and options, but the final issuance of Security Tokens on Tezos, will be as simple as filling out an on-line form. More info on the NYX standard here.