Already possible, in a fully compliant way, with open source solutions like the ERC-3643 token standard, and with enterprise-grade providers like @TokenySolutions
Tokeny just published the Ebook, 'Tokenized Securities', the ultimate handbook on how to issue compliant securities on the blockchain. Download the ebook for free: bit.ly/2FBZ2qb#STO
Onchain identities will be needed for this. That's why we are working on onchainid.com. The protocol is already used by large financial institutions and thousands of investors.