tZERO Launches Second Digital Security to Trade on PRO Securities ATS

OSTKO, the Digital Voting Series A-1 Preferred Stock, will replace its predecessor Blockchain Voting Series A Preferred Stock – OSTKP

AccessTimeIconJun 28, 2019 at 3:00 a.m. UTC
Updated Sep 13, 2021 at 9:22 a.m. UTC

tZERO, a blockchain company focused on capital markets, announced today that the Digital Voting Series A-1 Preferred Stock is the second digital security available for trade on its PRO Securities ATS, an SEC registered alternative trading system.

Listed as OSTKO – formerly OSTKP – it is available on the non-exchange venue that matches buyer and seller counterparties for transactions. The venue is backed by tZERO’s security token trading technology.

This follows on “the commencement of secondary resales among accredited investors of tZERO's security tokens in January 2019,” according to a company statement.

"This is a key step in the drive to attract additional assets, such as private companies, real estate, debt instruments, and commodities,” said Saum Noursalehi, CEO of tZERO.

Dinosaur Financial Group, a subscriber to PRO, will serve as broker-dealer. Trades can only be placed through a digital securities brokerage account at Dinosaur. Additionally, clearing and custody will be provided by Electronic Transaction Clearing, and Computershare will act as transfer agent.

Overstock issued the first SEC-registered digital security in the world, in 2016, the Blockchain Voting Series A Preferred Stock – OSTKP – using the same technology behind OSTKO, which will take over as its predecessor is retired.

tZERO is a subsidiary of, which develops blockchain-based financial technologies.


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